Does it check my data against a schema?

No, it checks JSON syntax only, not a schema. Schema validation may be added in the future.

Does my data leave the browser?

No, validation happens entirely on your device.

What counts as invalid JSON?

Trailing commas, unquoted keys, single quotes and comments are common causes of invalid JSON.

JSON Validator

Check whether your JSON is valid. Paste it in and get an instant pass/fail result, with the exact line and column of any syntax error.

Comment utiliser JSON Validator

1
Paste your JSON into the input box.
2
Click Validate.
3
See whether it's valid, and the exact line/column of any error.

Fonctionnalités de JSON Validator

Pinpoints the line and column of syntax errors.
Runs entirely in your browser.
Instant feedback as you fix issues.

Pourquoi choisir Tool King ?

Rapide

Pas d'attente ni d'inscription. La plupart des fichiers sont prêts en quelques secondes.

Privé

Les fichiers sont traités en mémoire puis supprimés immédiatement — jamais stockés ni partagés.

Gratuit

Chaque outil est gratuit, sans limite cachée sur l'essentiel.

Questions fréquentes

Guides associés

A quick guide to formatting and validating JSON

Turn minified or messy JSON into something readable — and catch syntax errors fast.

Lire le guide

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