diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da3c6b6fbd742bff6ee40.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
index 14eeb05a820..80877d96045 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
@@ -21,6 +21,12 @@ fetch("url-goes-here")
 
 Make a `GET` request to this URL: `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`. Don't terminate your code with a semicolon yet.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use the `fetch()` method to make a `GET` request to `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da42481d90c4314c99e94.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da42481d90c4314c99e94.md
index dd59d6caf9b..e6b5e990926 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da42481d90c4314c99e94.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da42481d90c4314c99e94.md
@@ -22,6 +22,12 @@ Chain the `.then()` method to your `fetch` call. Inside the `.then()` method, ad
 
 Again, don't terminate the code with a semicolon yet.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use the `fetch()` method to make a `GET` request to `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da465273051435d332b15.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da465273051435d332b15.md
index c3a10f10d91..d3b2bc7b13f 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da465273051435d332b15.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da465273051435d332b15.md
@@ -11,6 +11,12 @@ The data you get from a `GET` request is not usable at first. To make the data u
 
 Remove `console.log(res)` and implicitly return `res.json()` instead. 
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should remove the `console.log(res)`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da4b16937be43ba24c63d.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da4b16937be43ba24c63d.md
index ebab324b18c..4d7e61d4c50 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da4b16937be43ba24c63d.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da4b16937be43ba24c63d.md
@@ -12,6 +12,12 @@ In order to start working with the data, you will need to use another `.then()`
 Chain another `.then()` to the existing `.then()` method. This time, pass in `data` as the parameter for the callback function. For the callback, use a curly brace because you will have more than one expression. Within your callback function, log `data` to the console to see what it looks like.
 
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use the `fetch()` method to make a `GET` request to `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da51a9810e74411262fcc.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da51a9810e74411262fcc.md
index 9fc40900ebe..e6da5ec7742 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da51a9810e74411262fcc.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da51a9810e74411262fcc.md
@@ -13,6 +13,12 @@ Chain `.catch()` to the last `.then()`. Pass in a callback function with `err` a
 
 **Note**: `catch` is the last call chained on to fetch, so you can terminate your code with a semicolon.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use the `fetch()` method to make a `GET` request to `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5462576784453146ec2.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5462576784453146ec2.md
index 71690b72723..5b5bf697374 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5462576784453146ec2.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5462576784453146ec2.md
@@ -13,6 +13,12 @@ Instead, you should add 8 authors at a time, and have a button to add 8 more unt
 
 Use `let` to create 2 variables named `startingIndex` and `endingIndex`, and assign them the number values `0` and `8`, respectively. Also, create an `authorDataArr` variable with `let` and set it to an empty array.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use `let` to declare a variable named `startingIndex`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5abaac81844a54adb03.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5abaac81844a54adb03.md
index eb2683f23f8..4ea9905fd19 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5abaac81844a54adb03.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5abaac81844a54adb03.md
@@ -11,6 +11,12 @@ Now you'll create a function to populate the UI with the author data. You will c
 
 Create an empty arrow function named `displayAuthors` that takes `authors` as a parameter.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use `const` to create an empty function named `displayAuthors`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5dd6cd6db44f58b7787.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5dd6cd6db44f58b7787.md
index d2d4d64621c..ff5edf392d8 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5dd6cd6db44f58b7787.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da5dd6cd6db44f58b7787.md
@@ -9,6 +9,12 @@ dashedName: step-9
 
 Inside your `displayAuthors` function, chain `.forEach()` to `authors`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should chain `.forEach()` to `authors`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da615af82bf454215a992.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da615af82bf454215a992.md
index 95fbbccb26d..e6a2603711d 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da615af82bf454215a992.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da615af82bf454215a992.md
@@ -11,6 +11,12 @@ Pass an empty callback function to the `.forEach()` method. For the first parame
 
 For the second parameter, pass in `index`. This will represent the position of each author, and will be useful for pagination later.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should destructure `author`, `image`, `url`, and `bio` as the first parameter of your callback function. Don't forget to put them inside curly braces.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6570acf7545931ce477.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6570acf7545931ce477.md
index 445ceb01f55..feaf23a7bee 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6570acf7545931ce477.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6570acf7545931ce477.md
@@ -12,6 +12,12 @@ Now it's time to start building the HTML for the page with your destructured dat
 Inside your callback function, use the compound assignment operator to append an empty template literal to the `innerHTML` of `authorContainer`.
 
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should access the `innerHTML` of `authorContainer`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6dcb6e4c9463d54c75b.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6dcb6e4c9463d54c75b.md
index ff459c0ce49..2be65a2576b 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6dcb6e4c9463d54c75b.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da6dcb6e4c9463d54c75b.md
@@ -11,6 +11,12 @@ Inside the template literal, create a `div` element with the `id` set to the `in
 
 Also, add a `class` of `"user-card"` to the `div`.
  
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create a `div` element with the class `"user-card"`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7071d0d45467cd59977.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7071d0d45467cd59977.md
index b575baaf1e5..6a644ae525d 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7071d0d45467cd59977.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7071d0d45467cd59977.md
@@ -12,6 +12,12 @@ Now you need to show some information about the author. First, show the author's
 Create an `h2` tag with the `class` `"author-name"`. Then, interpolate `author` inside the `h2` tag. This is the author's name.
 
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create an `h2` element within your `div` element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da73b09e7f046c758e0ed.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da73b09e7f046c758e0ed.md
index b0008d137c8..b14f18f5432 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da73b09e7f046c758e0ed.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da73b09e7f046c758e0ed.md
@@ -11,6 +11,12 @@ To see the authors' names on the page, you need to call the `displayAuthors` fun
 
 First, remove your `console.log()` statement. Then, assign `data` to the `authorDataArr` variable.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints-- 
 
 You should remove the console log showing the `data`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da791d0c34a472b8d15b6.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da791d0c34a472b8d15b6.md
index 2ef2d866bee..27c82864a05 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da791d0c34a472b8d15b6.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da791d0c34a472b8d15b6.md
@@ -11,6 +11,12 @@ Now `authorDataArr` is the same as the `data` you logged to the console a while
 
 Inside your `console.log()` statement, add the text `"Author Data Array:"` as the first argument and `authorDataArr` as the second argument. Use comma to separate the text from `authorDataArr`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should assign `data` to the `authorDataArr` variable
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7bfbc7f0f477438ad8a.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
index 11581586d1a..79450e65698 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
@@ -11,6 +11,12 @@ Now it's time to call the `displayAuthors` function. But again, you don't want t
 
 First, remove the console log statement showing `authorDataArr`. Then, call the `displayAuthors` function with the `authorDataArr` array and `.slice()`. Use the `startingIndex` variable for the starting point and the `endingIndex` variable for the ending point.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should assign `data` to the `authorDataArr` variable
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da803d9892447d059804e.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da803d9892447d059804e.md
index 3552ae700c5..035b08713f4 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da803d9892447d059804e.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da803d9892447d059804e.md
@@ -15,6 +15,12 @@ Now create an image tag and give it the `class` `"user-img"`. Use string interpo
 window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
 ```    
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create an `img` element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da836581c254815f785fe.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da836581c254815f785fe.md
index b6f47b2a45e..e43e3999c75 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da836581c254815f785fe.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da836581c254815f785fe.md
@@ -17,6 +17,12 @@ Add a paragraph element with the `class` `"bio"`, then interpolate `bio` inside
 window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
 ```
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create a `p` element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da86294fd9f485d3c2bf0.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da86294fd9f485d3c2bf0.md
index 035736746b1..fce2e49f651 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da86294fd9f485d3c2bf0.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da86294fd9f485d3c2bf0.md
@@ -17,6 +17,12 @@ Add an anchor element with the `class` `"author-link"`, interpolate `url` as the
 window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
 ```
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create an anchor element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da895fb7ec648a5bdf19c.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da895fb7ec648a5bdf19c.md
index f4f4699c89d..25915c5298c 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da895fb7ec648a5bdf19c.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da895fb7ec648a5bdf19c.md
@@ -11,6 +11,12 @@ Now you have everything you want to include in the UI. The next step is to make
 
 Create a `fetchMoreAuthors` function with the arrow function syntax. Don't put anything in it yet. Make sure you use curly braces because you'll have more than one expression inside the function.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use `const` to create a `fetchMoreAuthors` function.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da8db2a036048ebe6999e.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da8db2a036048ebe6999e.md
index 3df81508d1c..119eb40723a 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da8db2a036048ebe6999e.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da8db2a036048ebe6999e.md
@@ -9,6 +9,12 @@ dashedName: step-21
 
 Inside the `fetchMoreAuthors` function, set the `startingIndex` and `endingIndex` variables to `+= 8` each.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should set the `startingIndex` variable to `+=8`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da97c987a514959ada414.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da97c987a514959ada414.md
index 0368cca3ac4..26804be65b9 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da97c987a514959ada414.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da97c987a514959ada414.md
@@ -11,6 +11,12 @@ Now call the `displayAuthors` function with a portion of the author data just li
 
 If you click the `Load More Authors` button after calling the function, it won't work. That's because you still have to add the `click` event listener to the button. You'll do that next.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should call your `displayAuthors` function.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9aceb788e49a73ebcc9.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9aceb788e49a73ebcc9.md
index 9a70f705e76..fdc87c052cc 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9aceb788e49a73ebcc9.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9aceb788e49a73ebcc9.md
@@ -13,6 +13,12 @@ Use `addEventListener` to add a `"click"` event listener to `loadMoreBtn`. Also,
 
 After that, when you click the button you should see 8 more authors.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should call the `addEventListener()` method on your `loadMoreBtn` variable.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9ea9b847a49fe6ee9b6.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9ea9b847a49fe6ee9b6.md
index 46541bbd2ed..7c64461975e 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9ea9b847a49fe6ee9b6.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641da9ea9b847a49fe6ee9b6.md
@@ -13,6 +13,12 @@ First, if you click the `Load More Authors` button a couple of times, you'll see
 
 Inside the `fetchMoreAuthors` function, write an `if` statement and set the condition to `authorDataArr.length <= endingIndex` – meaning there's no more data to load.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should have an `if` statement.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa5ea050f24a7cade6e6.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa5ea050f24a7cade6e6.md
index 38b38aa02ec..83076896d93 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa5ea050f24a7cade6e6.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa5ea050f24a7cade6e6.md
@@ -9,6 +9,12 @@ dashedName: step-25
 
 If this condition is met, disable the button by setting its `disabled` property to `true`. Also, set the `textContent` of the button to `"No more data to load"`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should set the `disabled` property of `loadMoreBtn` to `true`.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa8c2c3e364ac3650b37.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa8c2c3e364ac3650b37.md
index e8926c338b3..f0a6693532c 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa8c2c3e364ac3650b37.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daa8c2c3e364ac3650b37.md
@@ -17,6 +17,12 @@ Add a `div` element above the author's bio and give it the `class` `"purple-divi
 window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
 ```
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create a `div` element before your `p` element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daabed8d0584b1150c953.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daabed8d0584b1150c953.md
index 1ee8ba8decc..4c7571837c8 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daabed8d0584b1150c953.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daabed8d0584b1150c953.md
@@ -11,6 +11,12 @@ Some of the author bios are much longer than others. To give the cards a uniform
 
 Within the paragraph element, replace `bio` with a ternary operator. For the condition, check if the length of `bio` is greater than 50. If it is, use the `.slice()` method to extract the first 50 characters of `bio` and add an ellipsis at the end. Otherwise, show the full `bio`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create a `p` element.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daae5e18eae4b562633e4.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daae5e18eae4b562633e4.md
index ec73d564637..cbdb4db3b3d 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daae5e18eae4b562633e4.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daae5e18eae4b562633e4.md
@@ -11,6 +11,12 @@ Finally, what if there's an error and the author data fail to load? Then we need
 
 Inside the `.catch()`, remove the `console.error()` and set the `innerHTML` of the `authorContainer` to a `p` element with the `class` `"error-msg"` and text `"There was an error loading the authors"`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should remove your `console.error` and its text.
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641dab13c1b6f14b9828e6b1.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641dab13c1b6f14b9828e6b1.md
index eedcda11086..4a9c3aec1b6 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641dab13c1b6f14b9828e6b1.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-fetch-and-promises-by-building-an-fcc-authors-page/641dab13c1b6f14b9828e6b1.md
@@ -13,6 +13,12 @@ Access the `style` property of the `Load More Authors` button and set `cursor` t
 
 With that, your author page is complete!
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should access the `style` property of `loadMoreBtn` with a dot notation.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da3c6b6fbd742bff6ee40.md b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
index d5b4b560c88..3cd63eb8033 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da3c6b6fbd742bff6ee40.md
@@ -17,6 +17,12 @@ fetch("url-goes-here")
 
 Make a `GET` request to this URL: `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`. Don't terminate your code with a semicolon yet.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should use the `fetch()` method to make a `GET` request to `"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da7bfbc7f0f477438ad8a.md b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
index 83890bb437e..8efab5c48b0 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641da7bfbc7f0f477438ad8a.md
@@ -11,6 +11,12 @@ Now it's time to call the `displayAuthors` function. But again, you don't want t
 
 First, remove the console log statement showing `authorDataArr`. Then, call the `displayAuthors` function with the `authorDataArr` array and `.slice()`. Use the `startingIndex` variable for the starting point and the `endingIndex` variable for the ending point.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should assign `data` to the `authorDataArr` variable
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641daabed8d0584b1150c953.md b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641daabed8d0584b1150c953.md
index 617eeaee9a3..4bf9309fd9a 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641daabed8d0584b1150c953.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-fcc-authors-page/641daabed8d0584b1150c953.md
@@ -11,6 +11,12 @@ Some of the author bios are much longer than others. To give the cards a uniform
 
 Within the paragraph element, replace `bio` with a ternary operator. For the condition, check if the length of `bio` is greater than 50. If it is, use the `.slice()` method to extract the first 50 characters of `bio` and add an ellipsis at the end. Otherwise, show the full `bio`.
 
+# --before-all--
+
+```js
+window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'http://not-a-real-url.nowhere/no-image.jpg', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
+```
+
 # --hints--
 
 You should create a `p` element.