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JSON Formatter

Format, validate, and minify JSON with clear syntax error locations.

All text is processed in your browser. Nothing is uploaded to any server.
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JSON Formatter — Format, Validate & Minify JSON

Format messy JSON into readable, indented output, catch syntax errors with the exact line and column, or minify it for production. Runs entirely in your browser.

Quick answer: JSON Formatter

JSON Formatter cleans up messy or minified JSON into readable, indented output, and flags syntax errors with the exact line and column instead of a vague parser message. Paste your JSON, pick an indent width, and copy or download the result.

Input
Any JSON text — an API response, a config file, minified output.
Output
Pretty-printed or minified JSON, or a precise error location if it's invalid.
Know before use
Very large JSON (tens of MB) can slow down or freeze the tab since parsing happens on the main thread; split large files first.
Need to check a Base64 string instead? Try Base64 Encoder/Decoder.
  • ✓100% free, no sign-up required
  • ✓Runs entirely in your browser — no file upload to server
  • ✓Points to the exact line and column of a syntax error
  • ✓Sort keys and choose 2-space, 4-space, or tab indentation
  • ✓Privacy-first: your data never leaves your device

How to Use

  1. 1
    Prepare the input

    Any JSON text — an API response, a config file, minified output.

  2. 2
    Configure and process

    JSON Formatter cleans up messy or minified JSON into readable, indented output, and flags syntax errors with the exact line and column instead of a vague parser message. Paste your JSON, pick an indent width, and copy or download the result.

  3. 3
    Review the result

    Pretty-printed or minified JSON, or a precise error location if it's invalid.

What do I need to use JSON Formatter?

Any JSON text — an API response, a config file, minified output.

What does JSON Formatter produce?

Pretty-printed or minified JSON, or a precise error location if it's invalid.

What are the limitations of JSON Formatter?

Very large JSON (tens of MB) can slow down or freeze the tab since parsing happens on the main thread; split large files first.