Use xhr.responseType = 'json'.

lib/$.coffee

@@ -47,6 +47,8 @@ $.ajax = do ->
     if whenModified
       r.setRequestHeader 'If-Modified-Since', lastModified[url] if url of lastModified
       $.on r, 'load', -> lastModified[url] = r.getResponseHeader 'Last-Modified'
+    if /\.json$/.test url
+      r.responseType = 'json'
     $.extend r, options
     $.extend r.upload, upCallbacks
     r.send form

src/Archive/Redirect.coffee

@@ -37,7 +37,7 @@ Redirect =
       return if lastarchivecheck > now - 2 * $.DAY
       $.ajax '<%= meta.page %>json/archives.json', onload: ->
         if @status is 200
-          Conf['archives'] = JSON.parse @response
+          Conf['archives'] = @response
           Redirect.selectArchives()
           $.set
             lastarchivecheck: now

src/Filtering/ThreadHiding.coffee

@@ -61,7 +61,7 @@ ThreadHiding =
     $.cache "//a.4cdn.org/#{g.BOARD}/threads.json", ->
       return unless @status is 200
       threads = {}
-      for page in JSON.parse @response
+      for page in @response
         for thread in page.threads
           if thread.no of hiddenThreadsOnCatalog
             threads[thread.no] = hiddenThreadsOnCatalog[thread.no]

src/General/DataBoard.coffee

@@ -75,7 +75,7 @@ class DataBoard
         return
       board   = @data.boards[boardID]
       threads = {}
-      for page in JSON.parse e.target.response
+      for page in e.target.response
         for thread in page.threads
           if thread.no of board
             threads[thread.no] = board[thread.no]

src/General/Get.coffee

@@ -114,7 +114,7 @@ Get =
             "Error #{req.statusText} (#{req.status})."
       return
 
-    posts = JSON.parse(req.response).posts
+    {posts} = req.response
     Build.spoilerRange[boardID] = posts[0].custom_spoiler
     for post in posts
       break if post.no is postID # we found it!
@@ -145,7 +145,7 @@ Get =
       Get.insert post, root, context
       return
 
-    data = JSON.parse req.response
+    data = req.response
     if data.error
       $.addClass root, 'warning'
       root.textContent = data.error

src/General/Index.coffee

@@ -239,7 +239,7 @@ Index =
 
     try
       if req.status is 200
-        Index.parse JSON.parse(req.response), pageNum
+        Index.parse req.response, pageNum
       else if req.status is 304 and pageNum?
         Index.pageNav pageNum
     catch err

src/Images/ImageExpand.coffee

@@ -135,7 +135,7 @@ ImageExpand =
     # XXX CORS for i.4cdn.org WHEN?
     $.ajax "//a.4cdn.org/#{post.board}/res/#{post.thread}.json", onload: ->
       return if @status isnt 200
-      for postObj in JSON.parse(@response).posts
+      for postObj in @response.posts
         break if postObj.no is post.ID
       if postObj.no isnt post.ID
         clearTimeout timeoutID

src/Images/ImageHover.coffee

@@ -41,7 +41,7 @@ ImageHover =
     # XXX CORS for i.4cdn.org WHEN?
     $.ajax "//a.4cdn.org/#{post.board}/res/#{post.thread}.json", onload: ->
       return if @status isnt 200
-      for postObj in JSON.parse(@response).posts
+      for postObj in @response.posts
         break if postObj.no is post.ID
       if postObj.no isnt post.ID
         clearTimeout timeoutID

src/Miscellaneous/ExpandThread.coffee

@@ -74,13 +74,12 @@ ExpandThread =
       a.textContent = "Error #{req.statusText} (#{req.status})"
       return
 
-    data = JSON.parse(req.response).posts
-    Build.spoilerRange[thread.board] = data.shift().custom_spoiler
+    Build.spoilerRange[thread.board] = req.response.posts.shift().custom_spoiler
 
     posts      = []
     postsRoot  = []
     filesCount = 0
-    for postData in data
+    for postData in req.response.posts
       if post = thread.posts[postData.no]
         filesCount++ if 'file' of post
         postsRoot.push post.nodes.root

src/Monitoring/ThreadStats.coffee

@@ -41,10 +41,9 @@ ThreadStats =
       whenModified: true
   onThreadsLoad: ->
     return if @status isnt 200
-    pages = JSON.parse @response
-    for page in pages
+    for page in @response
       for thread in page.threads
         if thread.no is ThreadStats.thread.ID
           ThreadStats.pageCountEl.textContent = page.page
-          (if page.page is pages.length - 1 then $.addClass else $.rmClass) ThreadStats.pageCountEl, 'warning'
+          (if page.page is @response.length - 1 then $.addClass else $.rmClass) ThreadStats.pageCountEl, 'warning'
           return

src/Monitoring/ThreadUpdater.coffee

@@ -98,7 +98,7 @@ ThreadUpdater =
       switch req.status
         when 200
           g.DEAD = false
-          ThreadUpdater.parse JSON.parse(req.response).posts
+          ThreadUpdater.parse req.response.posts
           ThreadUpdater.setInterval()
         when 404
           g.DEAD = true