Formateur, validateur et embellisseur de JSON en ligne
Détection d'erreurs JSON en temps réel et coloration syntaxique
Formatez, validez et embellissez vos données JSON grâce à notre outil en ligne gratuit. Comparaison côte à côte avec coloration syntaxique et détection des erreurs.
Outil JSON en ligne professionnel pour développeurs et référenceurs SEO
Formater le JSON pour la lisibilité par machine et l'intégration d'API
JSON d'entrée
Collez vos données JSON non formatées ici
JSON mis en forme
Validated and formatted JSON
Validation en temps réel
Validation JSON instantanée avec messages d'erreur détaillés et coloration syntaxique.
Télécharger et copier
Téléchargez des fichiers JSON formatés ou copiez-les dans le presse-papiers en un clic.
Mise en forme personnalisable
Choisissez la taille d'indentation de votre choix (2, 4 ou 8 espaces) pour un formatage cohérent.
What is JSON Formatter & Validator?
The JSON Formatter and Validator takes raw, minified, or malformed JSON and transforms it into clean, properly indented, readable code. It validates JSON syntax with precise error locations — highlighting the exact line and character of any problem — and offers three output modes: beautified, minified, and interactive tree view. This makes it the complete browser-based tool for formatting, debugging, and exploring JSON data without needing a code editor.
JSON (JavaScript Object Notation) is the universal data format for REST APIs, configuration files, and NoSQL databases across virtually every technology stack. API responses and webhook payloads regularly arrive as dense, single-line strings that are impossible to read without formatting. The formatter transforms any JSON into readable, well-structured code in seconds.
Why Use JSON Formatter & Validator?
API responses, database exports, and configuration files regularly arrive as single-line, unformatted JSON strings. This formatter makes any JSON immediately human-readable, validates it for syntax errors before those errors break your application, and provides tree-view navigation for exploring deeply nested structures — all in seconds, directly in the browser without installing any tools.
Key Features of JSON Formatter & Validator
- ✓Beautifies JSON with configurable indentation (2 spaces, 4 spaces, or tabs)
- ✓Validates JSON syntax with precise error highlighting — shows exact line and column
- ✓Minifies JSON to the smallest possible string for production payloads
- ✓Interactive tree view for exploring nested objects and arrays
- ✓Supports JSON5 with trailing commas and inline comments
- ✓Copy to clipboard or download as a .json file
How to Use JSON Formatter & Validator
- 1
Paste your JSON
Enter raw, minified, or potentially invalid JSON into the input area.
- 2
Format or validate
Click Format to beautify, or Validate to check syntax. Invalid JSON shows the exact error location.
- 3
Review the output
See clean, indented JSON. Review any error messages with precise line and column references.
- 4
Fix errors if present
Common fixes: remove trailing commas, add double quotes around keys, close open brackets, escape backslashes in strings.
- 5
Copy or download
Copy the formatted JSON to clipboard or download as a .json file for use in your project.
Frequently Asked Questions about JSON Formatter & Validator
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