Formateur JSON
JSON is the lingua franca of web APIs, configuration files and NoSQL databases — but minified or hand-edited JSON is a nightmare to read. Our free JSON formatter takes a single-line blob of JSON and pretty-prints it with proper indentation, validates that the syntax is correct, and reports the exact line and column of any error. You can also minify JSON in the other direction.
Entrée JSON
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JSON valide InvalideLe JSON formaté apparaîtra ici
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Conseils de formatage JSON
À propos de JSON Formatter & Validator
JSON is the lingua franca of web APIs, configuration files and NoSQL databases — but minified or hand-edited JSON is a nightmare to read. Our free JSON formatter takes a single-line blob of JSON and pretty-prints it with proper indentation, validates that the syntax is correct, and reports the exact line and column of any error. You can also minify JSON in the other direction.
Comment l'utiliser
- Paste or type your JSON into the editor area.
- Click Format to pretty-print with proper indentation and line breaks.
- Click Validate to check syntax — errors show the exact line and column.
- Click Minify to compress JSON into a single line for production use.
- Copy the formatted or minified output with the copy button.
Formule et méthodologie
JSON parsing follows the ECMA-404 specification. Validation checks for: valid syntax, balanced brackets and braces, proper string escaping, correct number formatting, and no trailing commas.
Cas d'usage courants
- Formatting minified API responses for debugging during development
- Validating hand-edited configuration files before deployment
- Preparing JSON payloads for API testing in Postman or curl
- Minifying JSON to reduce payload size in production applications
- Teaching JSON syntax to students learning web development
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Gratuit pour usage personnel et commercial. Copiez simplement le code ci-dessous.