Json Formatter

JSON Formatter

Format, minify and validate JSON online — pretty-print with syntax checking in your browser.

Your data never leaves your browser — all processing happens locally on your device.

Paste JSON to format, minify, or validate.

About this tool

The JSON Formatter beautifies messy JSON with proper indentation, minifies it for production, or validates syntax with clear error messages. Paste API responses, config files or test data and get readable output instantly. Everything runs locally in your browser — your JSON never leaves your device.

How to use the JSON Formatter

  1. 1

    Paste your JSON

    Drop in raw or minified JSON from an API or file.

  2. 2

    Format or validate

    Click Format, Minify, or Validate.

  3. 3

    Copy the result

    Copy the cleaned output to your clipboard.

Frequently Asked Questions

Can this fix invalid JSON?

It reports syntax errors with a message so you can fix them. It does not auto-repair malformed JSON.

Is my JSON uploaded?

No. Formatting and validation happen entirely in your browser.

What indentation does Format use?

Pretty-print uses 2-space indentation, the common standard for JSON configs.

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