Format JSON consistently (pretty print) when writing to disk

Author: zpao

_comments.json

@@ -1,6 +1,6 @@
 [
-  {
-    "author": "Pete Hunt",
-    "text": "Hey there!"
-  }
+    {
+        "author": "Pete Hunt",
+        "text": "Hey there!"
+    }
 ]

server.js

@@ -31,7 +31,7 @@ app.post('/comments.json', function(req, res) {
   fs.readFile('_comments.json', function(err, data) {
     var comments = JSON.parse(data);
     comments.push(req.body);
-    fs.writeFile('_comments.json', JSON.stringify(comments), function(err) {
+    fs.writeFile('_comments.json', JSON.stringify(comments, null, 4), function(err) {
       res.setHeader('Content-Type', 'application/json');
       res.send(JSON.stringify(comments));
     });

server.php

@@ -22,7 +22,7 @@ function routeRequest()
                 $commentsDecoded[] = ['author'  => $_POST['author'],
                                       'text'    => $_POST['text']];
 
-                $comments = json_encode($commentsDecoded);
+                $comments = json_encode($commentsDecoded, JSON_PRETTY_PRINT);
                 file_put_contents('_comments.json', $comments);
             }
             header('Content-Type: application/json');

server.rb

@@ -22,7 +22,7 @@
   if req.request_method == 'POST'
     # Assume it's well formed
     comments << req.query
-    File.write('./_comments.json', comments.to_json)
+    File.write('./_comments.json', JSON.pretty_generate(comments, :indent => '    '))
   end
 
   # always return json