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JSON Formatter & Validator
Free JSON formatter and validator with readable error messages, 2- or 4-space indentation, and minification.
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Paste JSON to verify its syntax and produce a clean, consistently indented version. Choose pretty formatting or minification for compact storage and transmission.
JSON requires double-quoted property names and strings. Trailing commas, comments, and JavaScript-specific values such as undefined are invalid.
Frequently asked questions
Is my JSON uploaded?
No. Validation and formatting run in your browser.
Why are comments rejected?
The JSON standard does not allow comments.
Does sorting keys change arrays?
No. Array order is preserved; only object keys are alphabetized when selected.
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