Format and validate JSON without uploading it.

Paste compact JSON into the formatter to check whether it parses and turn nested objects and arrays into a readable document. The tool runs in the browser, so the input is not sent to a server.

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Format versus minify

Formatting adds indentation and line breaks for debugging and code review. Minifying removes unnecessary whitespace for a smaller payload. Both actions start by parsing the input, so a syntax error is reported before an output is created.

Common JSON errors

• Keys and string values need double quotes.
• Objects and arrays cannot have a trailing comma.
• JSON uses true, false, and null without quotes.

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