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JSON Formatter

Format, validate, beautify and minify JSON instantly in your browser — with pretty-printing, minification, recursive key sorting and precise error locations.

Paste JSON to get started

Options

Your JSON is processed locally in your browser and is never uploaded.

How it works

  1. 1Paste your JSON. Type or paste any JSON — objects, arrays, strings, numbers, booleans or null.
  2. 2Choose indentation and options. Pick 2 spaces, 4 spaces or tab indentation, and optionally sort object keys alphabetically at every depth.
  3. 3Format, minify or validate. Click Format JSON for pretty output, Minify for compact output, or Validate to check correctness without changing your input.
  4. 4Copy or download. Copy the formatted JSON, download it as a UTF-8 .json file, or move the result back into the input to keep editing.

Best practices

  • Validate before you trust a payload — invalid JSON shows the exact line and column of the problem.
  • Use 2-space or tab indentation for readable diffs; switch to Minify when you need to save bytes.
  • Enable Sort Object Keys to organize large objects alphabetically at every depth — array order is always preserved.
  • Large integers are read as JavaScript numbers and may lose precision beyond Number.MAX_SAFE_INTEGER.

Frequently Asked Questions

What does JSON Formatter do?
It validates, pretty-prints and minifies JSON. You can choose the indentation, sort object keys alphabetically, and see useful error locations when the JSON is invalid.
How do I beautify JSON?
Paste your JSON and click Format JSON. The output is indented and easy to read, with your chosen indentation — 2 spaces, 4 spaces or tab.
Can I minify JSON?
Yes. Click Minify to collapse the JSON into one compact line, which is handy for saving bytes before shipping.
Does it validate JSON?
Yes. Click Validate to check your JSON without changing it. Valid input shows a success state; invalid input shows the error message with the line and column where available.
Why is my JSON invalid?
Common causes are unquoted keys, single quotes instead of double quotes, trailing commas, missing commas or brackets, and comments — none of these are valid in strict JSON.
Does JSON support comments?
No. Comments are not part of the JSON specification, so they are rejected. The tool uses strict JSON only, not JSON5 or JavaScript object syntax.
Can JSON have trailing commas?
No. A trailing comma after the last property or array element is invalid JSON and is rejected with a helpful error.
Can it format Tamil or Unicode JSON?
Yes. Any valid Unicode JSON — Tamil, Hindi, Arabic, CJK, emoji and mixed-language text — is preserved exactly when formatting or minifying.
Does it send my text to an AI API?
No. This tool performs deterministic whitespace cleanup locally in your browser. Your text never leaves your device.

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Supported JSON

Format and validate strict JSON — objects, arrays, strings, numbers, booleans and null, plus nested structures and Unicode content (English, Tamil, Hindi, Arabic, CJK and emoji). Up to 5,000,000 characters per input are supported. JavaScript object syntax, single quotes, trailing commas and comments are rejected.

Privacy & data removal

Your JSON is processed entirely in your browser and is never uploaded to any server. No account is required to use the JSON Formatter, and we never store or share your data.