JSON Formatter
Format, minify, validate and sort JSON in your browser. Errors point to the exact problem. Nothing is uploaded.
Format, minify and validate JSON. Errors tell you exactly where the problem is.
Result
✓ Valid JSON - 4 keys, 68 characters.
{
"name": "DevKit",
"tools": 60,
"free": true,
"tags": [
"css",
"html",
"seo"
]
}About the json formatter
A JSON parse error tells you the position of the problem, which is usually a trailing comma, a single quote where a double belongs, or an unquoted key. This tool surfaces the parser's own message rather than a vague failure.
Everything runs in your browser, so you can paste an API response containing real data without it leaving your machine.
How to use it
- 1Paste your JSON.
- 2Read the validation result: valid shows the key count, invalid shows the parser error.
- 3Choose pretty printing with two or four spaces, or minify.
- 4Turn on key sorting to make two payloads comparable.
- 5Copy the output.
Questions
Is my data sent anywhere?
No. Parsing and formatting happen entirely in your browser, so nothing is transmitted or stored.
What causes most JSON errors?
Trailing commas, single quotes instead of double, unquoted keys, and JavaScript comments. None of those are valid JSON even though they look fine in code.
Why sort keys?
Two objects with the same data but different key order look completely different in a diff. Sorting both makes a real comparison possible.