Json Viewer

APIs, logs and databases often return JSON as one long minified line. The JSON viewer parses it and prints it with clean indentation so you can read the structure, spot the value you need and check that the JSON is valid. If the input is broken, it tells you where the error is.

How to use it

1. Paste JSON into the input.
2. Read the formatted output, or the error message with the position of the problem.
3. Copy the prettified JSON.

Example

Input (double quotes in real JSON):

{'user':{'id':42,'name':'Asha','roles':['admin','dev']},'active':true}

Output:

{
  'user': {
    'id': 42,
    'name': 'Asha',
    'roles': [
      'admin',
      'dev'
    ]
  },
  'active': true
}

The most common JSON syntax errors

• Trailing comma after the last item: [1, 2, ].
• Single quotes around strings or keys; JSON requires double quotes.
• Unquoted keys such as { name: 'x' }, valid in JavaScript but not in JSON.
• Comments, which standard JSON does not allow.
• Special values like NaN, Infinity or undefined.
• Unescaped characters such as a raw line break inside a string.

Tips

• Two-space indentation is the most common convention; four spaces is common in Python projects.
• From the terminal, jq . or python -m json.tool do the same job.
• Large numbers above 2^53 lose precision when parsed in JavaScript; IDs should be sent as strings.

Your JSON is parsed locally and never uploaded.