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Data & JSON · Free online tool

JSON Formatter & Validator

Beautify, minify and validate JSON instantly, with readable error feedback.

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Ready to use Processes locally in your browser
Formatted JSON
No upload is required for these text tools.

How to use JSON Formatter & Validator

Paste a JSON object or array, then format it for readability. Invalid JSON shows an error rather than silently changing your data.

  1. Type or paste your input into the editor.
  2. Adjust available options, then choose Format JSON.
  3. Review the result and copy or download it if useful.

Who is this tool for?

Students, developers, designers and anyone who works with data & json can use this tool to quickly test concepts without installing a full development environment.

Privacy and safety

Processing for this tool happens inside your browser, and CodingPremise does not receive the text you enter through a server-side processing endpoint. Your browser may still contact our hosting service to load this page. Avoid pasting passwords, private API credentials, or other sensitive information into websites you do not control.