Validateur JSON
Vérifiez la syntaxe et trouvez les erreurs JSON.
Développement
Formateur JSON
Formatez le JSON pour le rendre lisible.
Formateur JSON
Propulsé par UtilBrixLes méthodes détaillées et les exemples sont disponibles en anglais.
Step-by-step instructions (English)
- Paste a complete JSON value into the input field.
- Choose Format and an indentation style, or choose Minify for compact output.
- Run the tool; fix any syntax error before copying the result.
- Review large identifiers and duplicate object keys before replacing the original data.
Formule et méthode
JSON is parsed with the standard JSON parser, then serialized with two spaces, four spaces, tabs, or no added whitespace. Parsing rejects trailing commas, comments, and unquoted object keys. Very large numeric literals may lose precision under JavaScript number semantics.
Exemple pratique
The input {"a":1,"b":[2,3]} can be expanded into an indented object, or compacted back into one line without changing its JSON structure.
When this tool is useful
Inspect nested API responses, make configuration files easier to review, or create a compact JSON payload. Formatting changes presentation, while validation checks syntax; neither confirms that an API accepts the document structure.
Common mistakes and limitations
- JavaScript numbers can lose integer precision beyond the safe integer range; represent exact large identifiers as strings.
- Parsing and serializing can collapse duplicate object keys. Preserve the original input when investigating malformed producer output.
Practical questions about this tool (English)
Why are comments or trailing commas rejected?
They are not part of standard JSON syntax. Remove them or use the parser for the format you actually have, such as JSONC or a JavaScript object literal.
Does formatting validate my API schema?
No. A syntactically valid document can still omit required fields or contain incorrect types. Check the API schema separately.