JSON Formatter - Beautify & Pretty-Print JSON
Format and beautify raw JSON with syntax highlighting and custom indentation.
Processed 100% locally in your browser. Never sent to our server.
Moteur de traitement JSON
Indentation :
À propos de JSON Formatter - Beautify & Pretty-Print JSON
Parses raw JSON strings and re-serializes them with configurable indentation (2-space, 4-space, tab) for readability.
How to Format and Beautify JSON
1. Paste your raw or minified JSON string into the input editor.
2. Select your preferred indentation (2 spaces, 4 spaces, or tab).
3. The tool instantly parses, formats, and validates your JSON syntax.
4. Click "Copy Output" or "Download JSON" to save your clean formatted JSON.
Exemples d'utilisation
Formatting Minified API Response
Input: {"user":{"id":101,"name":"Alice","roles":["admin","editor"]}} Output (2 spaces): { "user": { "id": 101, "name": "Alice", "roles": [ "admin", "editor" ] } }
Foire aux questions
Does this JSON formatter send my data to a server?
No. All JSON parsing, syntax highlighting, and formatting happen 100% client-side in your web browser. Your data never leaves your device.
What happens if my JSON has syntax errors?
The built-in validator highlights the exact line and character position of syntax errors (e.g. missing commas or unquoted keys) so you can fix them immediately.
Can I format large JSON files?
Yes, our browser-native JavaScript parser handles JSON payloads up to tens of megabytes smoothly.