JSON Formatter
Format, pretty-print, and validate JSON instantly. Use it as a JSON beautifier to clean up API responses, debug invalid syntax, and make minified JSON readable right in your browser.
JSON beautifierPretty-printValidate JSONClient-side
Indent
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How to use
- Paste your JSON. Drop any JSON into the input box.
- Pick indent style. 2 spaces, 4 spaces, or tab for readable output.
- Copy the result or review the error. Formatted JSON appears instantly, or the page helps surface invalid syntax.
Common use cases
- Cleaning up minified API responses
- Validating JSON config before deploys
- Reviewing structured payloads in a readable format
Frequently asked questions
- What is this JSON formatter best for?
- It is best for pretty-printing JSON, validating syntax, and turning minified payloads into readable output during API debugging, app configuration work, and manual data inspection.
- Can I use it as a JSON validator too?
- Yes. The tool surfaces invalid input as you paste so you can spot syntax problems before copying the final result, and it has a dedicated JSON Validator slug for stricter checks.
- Does this JSON beautifier send data to a server?
- No. The formatting and validation run entirely in your browser using JSON.parse, so the JSON you paste never leaves your machine.
- Which JSON spec does the parser follow?
- It follows the strict JSON specification (RFC 8259 / ECMA-404), so trailing commas, single quotes, comments, and unquoted keys are all rejected as invalid.
- Can I sort the keys alphabetically?
- Yes. The Sort keys toggle reorders object keys alphabetically at every level, which produces stable diffs when you compare two JSON payloads in version control.
Related tools
How to use
- Paste your JSON. Drop any JSON into the input box.
- Pick indent style. 2 spaces, 4 spaces, or tab for readable output.
- Copy the result or review the error. Formatted JSON appears instantly, or the page helps surface invalid syntax.
Common use cases
- Cleaning up minified API responses
- Validating JSON config before deploys
- Reviewing structured payloads in a readable format
Frequently asked questions
- What is this JSON formatter best for?
- It is best for pretty-printing JSON, validating syntax, and turning minified payloads into readable output during API debugging, app configuration work, and manual data inspection.
- Can I use it as a JSON validator too?
- Yes. The tool surfaces invalid input as you paste so you can spot syntax problems before copying the final result, and it has a dedicated JSON Validator slug for stricter checks.
- Does this JSON beautifier send data to a server?
- No. The formatting and validation run entirely in your browser using JSON.parse, so the JSON you paste never leaves your machine.
- Which JSON spec does the parser follow?
- It follows the strict JSON specification (RFC 8259 / ECMA-404), so trailing commas, single quotes, comments, and unquoted keys are all rejected as invalid.
- Can I sort the keys alphabetically?
- Yes. The Sort keys toggle reorders object keys alphabetically at every level, which produces stable diffs when you compare two JSON payloads in version control.