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Formateur JSON

Embellir, minifier et valider les donnees JSON

JSON en entree
Collez vos donnees JSON ici
Sortie
JSON formate

Comment utiliser

1

Collez ou saisissez du texte

Entrez votre texte, code ou données dans la zone de saisie.

2

Choisissez les options

Sélectionnez la transformation ou le format que vous souhaitez appliquer.

3

Copiez le résultat

Copiez la sortie dans votre presse-papiers en un clic.

Pourquoi utiliser cet outil

100 % Gratuit

Aucun coût caché, aucun niveau premium — chaque fonctionnalité est gratuite.

Aucune installation

Fonctionne entièrement dans votre navigateur. Aucun logiciel à télécharger ou installer.

Privé et sécurisé

Vos données ne quittent jamais votre appareil. Rien n'est envoyé sur un serveur.

Fonctionne sur mobile

Entièrement adaptatif — utilisez-le sur votre téléphone, tablette ou ordinateur.

Understanding JSON Formatting and Validation

Key Takeaways

  • Well-formatted JSON improves readability and makes debugging API responses significantly faster.
  • JSON validation catches syntax errors like missing commas, unquoted keys, and trailing commas before they cause runtime failures.
  • All formatting and validation happens entirely in your browser — your data never leaves your device.

JSON (JavaScript Object Notation) has become the universal data interchange format for web APIs, configuration files, and NoSQL databases. Despite its simplicity, malformed JSON is one of the most common causes of integration failures. A reliable formatter and validator helps developers quickly identify structural issues and produce clean, readable output.

Over 90% of public REST APIs use JSON as their primary response format.

Industry Usage

Common Use Cases

1

API Response Debugging

Paste minified API responses to instantly see the nested structure, making it easy to locate specific fields and identify unexpected values.

2

Configuration File Editing

Format and validate package.json, tsconfig.json, and other config files to catch syntax errors before deployment.

3

Database Document Inspection

Pretty-print MongoDB or Firestore documents to understand complex nested schemas and embedded arrays.

4

Webhook Payload Analysis

Format incoming webhook payloads from services like Stripe or GitHub to verify data structure matches your expectations.

Pro Tips

Use 2-space indentation for compact output or 4-space for maximum readability — choose based on your team's style guide.

Sort keys alphabetically when comparing two JSON objects to quickly spot differences.

Minify JSON before sending it over the network to reduce payload size and improve transfer speed.

Watch for common pitfalls: trailing commas, single quotes instead of double quotes, and unquoted property names are all invalid JSON.

All JSON formatting and validation is performed entirely in your browser using client-side JavaScript. Your data is never transmitted to any server, ensuring complete privacy for sensitive API responses and configuration data.

Questions fréquentes