JSON parse issue with ajax

Question

This is the XMLHttpRequest object. When I put it on cosole.log it gives the following response:

console.log(this.responseText);
"[
  {
    "url": "https://api.github.com/gists/c7c0df592e99c0c34b99",
    "forks_url": "https://api.github.com/gists/c7c0df592e99c0c34b99/forks",
    "commits_url": "https://api.github.com/gists/c7c0df592e99c0c34b99/commits",
    "id": "c7c0df592e99c0c34b99",
    "git_pull_url": "https://gist.github.com/c7c0df592e99c0c34b99.git",
    "git_push_url": "https://gist.github.com/c7c0df592e99c0c34b99.git",
    "html_url": "https://gist.github.com/c7c0df592e99c0c34b99",
    "files": {
      "config.json": {
        "filename": "config.json",
        "type": "application/json",
        "language": "JSON",
        "raw_url": "https://gist.githubusercontent.com/anonymous/c7c0df592e99c0c34b99/raw/70489beaa4953f89fc8848195371da6eca76164c/config.json",
        "size": 17911
      }
    },
    "public": true,
    "created_at": "2015-04-26T20:34:11Z",
    "updated_at": "2015-04-26T20:34:11Z",
    "description": "Bootstrap Customizer Config",
    "comments": 0,
    "user": null,
    "comments_url": "h"[…]

But when I try to use JSON.parse on it it gives me an error: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data.

gists = JSON.parse(this.reponseText)

im supposed to be using this api https://developer.github.com/v3/gists/ and its supposed to return valid json according to that documentation

Is the above data that was returned by the website not valid JSON? Or am I supposed to use a different function other than JSON.parse? Or what is going on? Please help.

full pastebin here: http://pastebin.com/BWttNtXP

It's not valid JSON is why... how is it being produced? Can we see that code? — StudioTime
– StudioTime, Commented Apr 26, 2015 at 20:45
You need to replace starting quotes to single for start, because your inner quotes are double. — Chavdar Slavov
– Chavdar Slavov, Commented Apr 26, 2015 at 20:46
@ChavdarSlavov — That's possibly an artefact of the viewer that JSON was copy/pasted from. — Quentin
– Quentin, Commented Apr 26, 2015 at 20:47
Other than the string quote the JSON is perfectly valid, can you give us a reference to the full json? — Chavdar Slavov
– Chavdar Slavov, Commented Apr 26, 2015 at 20:51

Yogi · Accepted Answer · 2015-04-26 22:09:00Z

Update: Problem Solved

The root problem is a typographical error in the code. Can you spot it?

gists = JSON.parse(this.reponseText);

Corrected:

gists = JSON.parse(this.responseText);

OP's code code works normally once this change is made.

Well, anyone that's coded for awhile knows how easy it is to waste a lot of time on something as simple as a missing bracket or semicolon. And when you finally find it ... D'oh!

Original Post:

There doesn't appear to be anything wrong with the json source as the below code is able to pull and process the data fine. Click "Run Code Snippet" to view.

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=10" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>JSON</title>
</head>
<body>
<h1 style="background-color:steelblue; color:white; padding:5px;">JSON DATA TEST</h1>
Raw Data:
<textarea id="output" style="width: 100%; height: 40em;padding:0.5em; border:1px black solid;"></textarea>

<script type="text/javascript">
    // synchronous request for testing only.
	var xhr = new XMLHttpRequest();
	xhr.open('GET', 'https://api.github.com/gists/public', false);
	xhr.send();
	document.getElementById('output').value = xhr.responseText;
	
	try {
		var data = JSON.parse( xhr.responseText );
		alert( 'SUCCESS:\n' + data[0].forks_url );
	}
	catch(e){ alert( 'ERROR:\n' + e.description ); }
</script>
</body>
</html>

michalh · Accepted Answer · 2015-04-26 20:57:03Z

0

Try this :)

    console.log(this.responseText);
    var txt = this.responseText.trim("\"");
    gists = JSON.parse(txt);

this way your pastebin html works ok

answered Apr 26, 2015 at 20:57

michalh

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