OpenToolsKit
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Data utility

JSON Formatter & Validator

Fix JSON before it breaks the request.

Paste a payload, format it for readability, minify it for transport, or validate it before you push it into an API or config file.

Useful for developers, QA, support, no-code builders, and anyone handling structured API data.

Fast answer: Need json formatter? Useful for developers, QA, support, no-code builders, and anyone handling structured API data.

ModesFormat, validate, minify
Best forAPI payloads
OutputClean JSON
Live tool

JSON Formatter & Validator

Use format for readability, validate for a quick parse check, and minify for transport.

Browser-side transform
Live metrics1 words

72 chars with spaces, 1 lines, 1 min read.

Examples
What this tool does

Use this when the job matches the route exactly.

Format, minify, and validate JSON with instant error feedback in the browser.

Useful for developers, QA, support, no-code builders, and anyone handling structured API data.

Best for

Common reasons people land here.

  • Inspect an API response
  • Validate config data
  • Minify payloads before transport
How to use it

Run the workflow in a short sequence.

  1. Paste your JSON payload.
  2. Choose format, validate, or minify.
  3. Copy the cleaned result or the validation feedback.
Supported inputs

What you can start with.

  • Pasted text or short form fields entered directly in the browser
Supported outputs

What to expect from the result.

  • Copy-ready text result generated entirely in the browser
Limits and constraints

What this tool does not silently solve for you.

  • The tool cleans and reshapes text locally in the browser
  • Platform-specific rendering can still vary after you paste the result elsewhere
Common issues

Fix the most frequent blockers quickly.

  • The transformed text is not what you expected. Review the pasted input for extra spaces, punctuation, or formatting that should be removed first.
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text-data
FAQ

Short answers before you use the tool.

Does this validate malformed JSON?

Yes. The tool reports parsing errors and shows the raw input if validation fails.

Can I minify valid JSON here too?

Yes. Switch the mode to minify and OpenToolsKit will compact the payload.