Free JSON Formatter - Format, Validate, Highlight, and Minify JSON

Paste JSON

Output

Formatted JSON will appear here.

How to format and validate JSON

Use formatting to inspect structure and minification only after the data parses successfully.

Paste the JSON

Insert the object, array, API response, or configuration data. Avoid pasting secrets you do not need to inspect.
Format or minify

Format for indentation and syntax highlighting, or minify when you need compact valid JSON.
Resolve errors and export

If parsing fails, use the reported position as a starting point. After validation succeeds, copy or download the result.

JSON requires double quotes around property names and string values; single quotes are not valid JSON.
Trailing commas after the final property or array item cause strict JSON parsing to fail.
Comments, undefined, NaN, and JavaScript functions are not part of the JSON data format.

Successful parsing confirms JSON syntax, not whether the data follows an API contract or JSON Schema.
The tool does not automatically repair invalid input because silent fixes could change meaning.
Very large payloads can use substantial browser memory and may be better handled with command-line or streaming tools.

No. Formatting, minifying, validation, copying, and download generation all run in your browser.

No. It validates JSON and shows parser errors so you can fix the source without guessing what changed.

Format adds readable indentation and highlighted tokens for review, while minify removes extra whitespace for compact snippets and payloads.