diff --git a/.eslintrc.json b/.eslintrc.json
index ca46d1a47f..039667f844 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -124,7 +124,7 @@
         "no-new": 2,
         "no-new-func": 2,
         "no-native-reassign": 2,
-        "no-plusplus": 1,
+        "no-plusplus": 2,
         "no-delete-var": 2,
         "no-return-assign": 2,
         "no-new-object": 2,
diff --git a/frontend_tests/casper_lib/common.js b/frontend_tests/casper_lib/common.js
index 547ac48246..8f76f0e8cc 100644
--- a/frontend_tests/casper_lib/common.js
+++ b/frontend_tests/casper_lib/common.js
@@ -56,7 +56,7 @@ exports.initialize_casper = function (viewport) {
     casper.test.on('fail', function failure() {
         if (casper_failure_count <= 10) {
             casper.capture("var/casper/casper-failure" + casper_failure_count + ".png");
-            casper_failure_count++;
+            casper_failure_count += 1;
         }
     });
 
diff --git a/frontend_tests/node_tests/unread.js b/frontend_tests/node_tests/unread.js
index 34ceefff47..feca534562 100644
--- a/frontend_tests/node_tests/unread.js
+++ b/frontend_tests/node_tests/unread.js
@@ -191,7 +191,7 @@ var zero_counts = {
 
     var num_msgs = 10000;
     var i;
-    for (i = 0; i < num_msgs; ++i) {
+    for (i = 0; i < num_msgs; i += 1) {
         message.id = i+1;
         unread.process_loaded_messages([message]);
     }
@@ -199,7 +199,7 @@ var zero_counts = {
     count = unread.num_unread_for_subject('social', 'lunch');
     assert.equal(count, num_msgs);
 
-    for (i = 0; i < num_msgs; ++i) {
+    for (i = 0; i < num_msgs; i += 1) {
         message.id = i+1;
         unread.process_read_message(message);
     }
diff --git a/frontend_tests/node_tests/util.js b/frontend_tests/node_tests/util.js
index 15b2d66f8d..02de5937a0 100644
--- a/frontend_tests/node_tests/util.js
+++ b/frontend_tests/node_tests/util.js
@@ -188,19 +188,19 @@ var _ = global._;
       'some_email@**everyone**.com'
     ];
     var i;
-    for (i=0; i<messages_with_all_mentions.length; i++) {
+    for (i=0; i<messages_with_all_mentions.length; i += 1) {
         assert(util.is_all_or_everyone_mentioned(messages_with_all_mentions[i]));
     }
 
-    for (i=0; i<messages_with_everyone_mentions.length; i++) {
+    for (i=0; i<messages_with_everyone_mentions.length; i += 1) {
         assert(util.is_all_or_everyone_mentioned(messages_with_everyone_mentions[i]));
     }
 
-    for (i=0; i<messages_without_all_mentions.length; i++) {
+    for (i=0; i<messages_without_all_mentions.length; i += 1) {
         assert(!util.is_all_or_everyone_mentioned(messages_without_everyone_mentions[i]));
     }
 
-    for (i=0; i<messages_without_everyone_mentions.length; i++) {
+    for (i=0; i<messages_without_everyone_mentions.length; i += 1) {
         assert(!util.is_all_or_everyone_mentioned(messages_without_everyone_mentions[i]));
     }
 }());
diff --git a/static/js/activity.js b/static/js/activity.js
index 730197b033..883906e7a8 100644
--- a/static/js/activity.js
+++ b/static/js/activity.js
@@ -176,7 +176,7 @@ exports.huddle_fraction_present = function (huddle, presence_info) {
         if (presence_info[user_id]) {
             var status = presence_info[user_id].status;
             if (status && (status !== 'offline')) {
-                ++num_present;
+                num_present += 1;
             }
         }
     });
diff --git a/static/js/admin.js b/static/js/admin.js
index b3b1177d03..740cc9c32a 100644
--- a/static/js/admin.js
+++ b/static/js/admin.js
@@ -264,7 +264,7 @@ function _setup_page() {
     var domains_string = stringify_list_with_conjunction(page_params.domains, "or");
     var atdomains = page_params.domains.slice();
     var i;
-    for (i = 0; i < atdomains.length; i++) {
+    for (i = 0; i < atdomains.length; i += 1) {
         atdomains[i] = '@' + atdomains[i];
     }
     var atdomains_string = stringify_list_with_conjunction(atdomains, "or");
diff --git a/static/js/compose_fade.js b/static/js/compose_fade.js
index 06322b06ae..1a90b116d6 100644
--- a/static/js/compose_fade.js
+++ b/static/js/compose_fade.js
@@ -61,7 +61,7 @@ function _fade_messages() {
     normal_display = false;
 
     // Update the visible messages first, before the compose box opens
-    for (i = 0; i < visible_groups.length; i++) {
+    for (i = 0; i < visible_groups.length; i += 1) {
         first_row = rows.first_message_in_group(visible_groups[i]);
         first_message = current_msg_list.get(rows.id(first_row));
         should_fade_group = !fade_heuristic(focused_recipient, first_message);
@@ -83,7 +83,7 @@ function _fade_messages() {
 
         // Note: The below algorithm relies on the fact that all_elts is
         // sorted as it would be displayed in the message view
-        for (i = 0; i < all_groups.length; i++) {
+        for (i = 0; i < all_groups.length; i += 1) {
             var group_elt = $(all_groups[i]);
             should_fade_group = !fade_heuristic(focused_recipient, rows.recipient_from_group(group_elt));
             change_fade_state(group_elt, should_fade_group);
diff --git a/static/js/copy_and_paste.js b/static/js/copy_and_paste.js
index a730df0417..15cdc38bed 100644
--- a/static/js/copy_and_paste.js
+++ b/static/js/copy_and_paste.js
@@ -19,7 +19,7 @@ function find_boundary_tr(initial_tr, iterate_row) {
     // To ensure we can't enter an infinite loop, bail out (and let the
     // browser handle the copy-paste on its own) if we don't hit what we
     // are looking for within 10 rows.
-    for (j = 0; (!tr.is('.message_row')) && j < 10; j++) {
+    for (j = 0; (!tr.is('.message_row')) && j < 10; j += 1) {
         tr = iterate_row(tr);
     }
     if (j === 10) {
@@ -41,7 +41,7 @@ function copy_handler(e) {
     var start_data, end_data;
     var skip_same_td_check = false;
     var div = $('<div>'), content;
-    for (i = 0; i < selection.rangeCount; i++) {
+    for (i = 0; i < selection.rangeCount; i += 1) {
         range = selection.getRangeAt(i);
         ranges.push(range);
 
diff --git a/static/js/echo.js b/static/js/echo.js
index fcea0c5f5e..4a1f185e3c 100644
--- a/static/js/echo.js
+++ b/static/js/echo.js
@@ -103,7 +103,7 @@ function add_subject_links(message) {
                 var current_group = i + 1;
                 var back_ref = "\\" + current_group;
                 link_url = link_url.replace(back_ref, matched_group);
-                i++;
+                i += 1;
             }
             links.push(link_url);
         }
@@ -352,7 +352,7 @@ function handleRealmFilter(pattern, matches) {
     _.each(matches, function (match) {
         var back_ref = "\\" + current_group;
         url = url.replace(back_ref, match);
-        current_group++;
+        current_group += 1;
     });
 
     return url;
@@ -373,7 +373,7 @@ function python_to_js_filter(pattern, url) {
 
         match = named_group_re.exec(pattern);
 
-        current_group++;
+        current_group += 1;
     }
     // Convert any python in-regex flags to RegExp flags
     var js_flags = 'g';
diff --git a/static/js/message_edit.js b/static/js/message_edit.js
index a19a36afd1..5ff8c51684 100644
--- a/static/js/message_edit.js
+++ b/static/js/message_edit.js
@@ -239,7 +239,7 @@ function edit_message (row, raw_content) {
         // since otherwise there is a noticeable lag
         message_edit_countdown_timer.text(timer_text(seconds_left));
         var countdown_timer = setInterval(function () {
-            if (--seconds_left <= 0) {
+            if (seconds_left - 1 <= 0) {
                 clearInterval(countdown_timer);
                 message_edit_content.prop("readonly", "readonly");
                 if (message.type === 'stream') {
diff --git a/static/js/message_list.js b/static/js/message_list.js
index bfc8a676b6..24cc02f0c9 100644
--- a/static/js/message_list.js
+++ b/static/js/message_list.js
@@ -260,7 +260,7 @@ exports.MessageList.prototype = {
             // for lower_bound purposes, find the real leftmost index (first non-local id)
             do {
                 potential_closest_matches.push(closest);
-                closest--;
+                closest -= 1;
             } while (closest > 0 && this._is_localonly_id(items[closest - 1].id));
         }
         potential_closest_matches.push(closest);
@@ -308,7 +308,7 @@ exports.MessageList.prototype = {
                 break;
             }
             next_msg_id = msg_id;
-            ++idx;
+            idx += 1;
         }
 
         if (next_msg_id > 0) {
diff --git a/static/js/message_store.js b/static/js/message_store.js
index 4c639d8e65..36ef034cc7 100644
--- a/static/js/message_store.js
+++ b/static/js/message_store.js
@@ -29,7 +29,7 @@ exports.get_private_message_recipient = function (message, attr, fallback_attr)
     if (recipient === undefined && fallback_attr !== undefined) {
         recipient = other_recipients[0][fallback_attr];
     }
-    for (i = 1; i < other_recipients.length; i++) {
+    for (i = 1; i < other_recipients.length; i += 1) {
         var attr_value = other_recipients[i][attr];
         if (attr_value === undefined && fallback_attr !== undefined) {
             attr_value = other_recipients[i][fallback_attr];
@@ -384,7 +384,7 @@ exports.insert_new_messages = function insert_new_messages(messages) {
 
         // Iterate backwards to find the last message sent_by_me, stopping at
         // the pointer position.
-        for (i = messages.length-1; i>=0; i--) {
+        for (i = messages.length-1; i>=0; i -= 1) {
             var id = messages[i].id;
             if (id <= selected_id) {
                 break;
diff --git a/static/js/notifications.js b/static/js/notifications.js
index 6a416a46ff..fc8b3f61ca 100644
--- a/static/js/notifications.js
+++ b/static/js/notifications.js
@@ -276,7 +276,7 @@ function process_notification(notification) {
 
     if (content.length > 150) {
         // Truncate content at a word boundary
-        for (i = 150; i > 0; i--) {
+        for (i = 150; i > 0; i -= 1) {
             if (content[i] === ' ') {
                 break;
             }
diff --git a/static/js/popovers.js b/static/js/popovers.js
index 59d7a4a43d..2c8f51221e 100644
--- a/static/js/popovers.js
+++ b/static/js/popovers.js
@@ -131,9 +131,9 @@ exports.actions_menu_handle_keyboard = function (key) {
     if (index === -1) {
         index = 0;
     } else if ((key === 'down_arrow' || key === 'vim_down') && index < items.length - 1) {
-        ++index;
+        index += 1;
     } else if ((key === 'up_arrow' || key === 'vim_up') && index > 0) {
-        --index;
+        index -= 1;
     }
     items.eq(index).focus();
 };
diff --git a/static/js/referral.js b/static/js/referral.js
index b1699dd3e8..b7abe29a4c 100644
--- a/static/js/referral.js
+++ b/static/js/referral.js
@@ -26,12 +26,12 @@ exports.update_state = function (granted, used) {
         $("#referral-form input").attr('placeholder', _.shuffle(placeholder_invitees).pop());
         $("#invite-hearts").empty();
         var i;
-        for (i = 0; i < used; i++) {
+        for (i = 0; i < used; i += 1) {
             $("#invite-hearts").append($('<i class="icon-vector-heart"> </i>'));
         }
 
         var invites_left = Math.max(0, granted - used);
-        for (i = 0; i < invites_left; i++) {
+        for (i = 0; i < invites_left; i += 1) {
             $("#invite-hearts").append($('<i class="icon-vector-heart-empty"> </i>'));
         }
 
diff --git a/static/js/search_suggestion.js b/static/js/search_suggestion.js
index eafbd1c288..35a6ae261b 100644
--- a/static/js/search_suggestion.js
+++ b/static/js/search_suggestion.js
@@ -13,7 +13,7 @@ function phrase_match(phrase, q) {
     }
 
     var parts = phrase.split(' ');
-    for (i = 0; i < parts.length; i++) {
+    for (i = 0; i < parts.length; i += 1) {
         if (parts[i].indexOf(q) === 0) {
             return true;
         }
@@ -304,7 +304,7 @@ function get_operator_subset_suggestions(query, operators) {
     var i;
     var suggestions = [];
 
-    for (i = operators.length - 1; i >= 1; --i) {
+    for (i = operators.length - 1; i >= 1; i -= 1) {
         var subset = operators.slice(0, i);
         var search_string = Filter.unparse(subset);
         var description = Filter.describe(subset);
diff --git a/static/js/socket.js b/static/js/socket.js
index 72320fa781..b5f1f6e4a6 100644
--- a/static/js/socket.js
+++ b/static/js/socket.js
@@ -89,7 +89,7 @@ Socket.prototype = {
 
     _get_next_req_id: function Socket__get_next_req_id() {
         var req_id = page_params.event_queue_id + ':' + this._next_req_id_counter;
-        this._next_req_id_counter++;
+        this._next_req_id_counter += 1;
         return req_id;
     },
 
@@ -239,7 +239,7 @@ Socket.prototype = {
                 };
                 request.error = function (type, resp) {
                   blueslip.info("Could not authenticate with server: " + resp.msg);
-                  that._connection_failures++;
+                  that._connection_failures += 1;
                   that._try_to_reconnect({reason: 'auth_fail',
                                           wait_time: that._reconnect_wait_time()});
                 };
@@ -277,7 +277,7 @@ Socket.prototype = {
 
             blueslip.info("SockJS connection lost.  Attempting to reconnect soon."
                           + " (" + event.code.toString() + ", " + event.reason + ")");
-            that._connection_failures++;
+            that._connection_failures += 1;
             that._is_reconnecting = false;
             // We don't need to specify a reason because the Socket is already closed
             that._try_to_reconnect({wait_time: that._reconnect_wait_time()});
diff --git a/static/js/src/main.js b/static/js/src/main.js
index 19e4986299..9bc744bf15 100644
--- a/static/js/src/main.js
+++ b/static/js/src/main.js
@@ -39,7 +39,7 @@
         }, function () {
             var i;
             initialized = true;
-            for (i=0; i<callbacks.length; i++) {
+            for (i=0; i<callbacks.length; i += 1) {
                 callbacks[i]();
             }
         });
diff --git a/static/js/stream_color.js b/static/js/stream_color.js
index 95cf39767f..33917e8410 100644
--- a/static/js/stream_color.js
+++ b/static/js/stream_color.js
@@ -172,7 +172,7 @@ exports.get_color_class = _.memoize(function (color) {
 
     // CSS colors are specified in the sRGB color space.
     // Convert to linear intensity values.
-    for (i=0; i<3; i++) {
+    for (i=0; i<3; i += 1) {
         channel[i] = colorspace.sRGB_to_linear(mult * parseInt(match[i+1], 16));
     }
 
diff --git a/static/js/templates.js b/static/js/templates.js
index 9aec67c7ff..e03c7d4f56 100644
--- a/static/js/templates.js
+++ b/static/js/templates.js
@@ -54,7 +54,7 @@ Handlebars.registerHelper('if_and', function () {
     //     {{/if_and}}
     var options = arguments[arguments.length - 1];
     var i;
-    for (i = 0; i < arguments.length - 1; i++) {
+    for (i = 0; i < arguments.length - 1; i += 1) {
         if (!arguments[i]) {
             return options.inverse(this);
         }
@@ -70,7 +70,7 @@ Handlebars.registerHelper('if_or', function () {
     //     {{/if_or}}
     var options = arguments[arguments.length - 1];
     var i;
-    for (i = 0; i < arguments.length - 1; i++) {
+    for (i = 0; i < arguments.length - 1; i += 1) {
         if (arguments[i]) {
             return options.fn(this);
 
diff --git a/static/js/timerender.js b/static/js/timerender.js
index 84e877f4e6..5154c9151e 100644
--- a/static/js/timerender.js
+++ b/static/js/timerender.js
@@ -89,7 +89,7 @@ function render_date_span(elem, time_str, time_above_str) {
 // okay since to update the time later we look up the node by its id.)
 exports.render_date = function (time, time_above) {
     var id = "timerender" + next_timerender_id;
-    next_timerender_id++;
+    next_timerender_id += 1;
     var rendered_time = exports.render_now(time);
     var node = $("<span />").attr('id', id);
     if (time_above !== undefined) {
diff --git a/static/js/typeahead_helper.js b/static/js/typeahead_helper.js
index f14174dc56..7c20244b65 100644
--- a/static/js/typeahead_helper.js
+++ b/static/js/typeahead_helper.js
@@ -50,7 +50,7 @@ exports.highlight_query_in_phrase = function (query, phrase) {
 
     var result = "";
     var parts = phrase.split(' ');
-    for (i = 0; i < parts.length; i++) {
+    for (i = 0; i < parts.length; i += 1) {
         if (i > 0) {
             result += " ";
         }
diff --git a/static/js/util.js b/static/js/util.js
index 30cdc8e025..9911133a7d 100644
--- a/static/js/util.js
+++ b/static/js/util.js
@@ -45,7 +45,7 @@ exports.lower_bound = function (array, arg1, arg2, arg3, arg4) {
         middle = first + step;
         if (less(array[middle], value, middle)) {
             first = middle;
-            first++;
+            first += 1;
             len = len - step - 1;
         } else {
             len = step;
@@ -144,7 +144,7 @@ exports.robust_uri_decode = function (str) {
             if (!(e instanceof URIError)) {
                 throw e;
             }
-            end--;
+            end -= 1;
         }
     }
     return '';
@@ -177,7 +177,7 @@ exports.array_compare = function util_array_compare(a, b) {
         return false;
     }
     var i;
-    for (i = 0; i < a.length; ++i) {
+    for (i = 0; i < a.length; i += 1) {
         if (a[i] !== b[i]) {
             return false;
         }