{ }JSON Formatter
Format, validate and beautify JSON data
JSON Formatter Complete Guide
A free online tool to neatly format JSON data and instantly validate syntax errors. Essential for API debugging, config file inspection, and data structure analysis — used daily by developers.
Key Features
- Format: Indent JSON with 2/4 spaces or tabs
- Minify: Strip whitespace to reduce file size (for API transport)
- Live Validation: Syntax errors shown in red immediately
- Structure Stats: Auto-analyze key count, objects/arrays, max depth, byte size
- Download: Save result as .json file
- Sample Data: Quick test with example JSON
Common JSON Errors
| Error | Cause | Fix |
|---|---|---|
| Unexpected token ' | Single quotes | Use double quotes (") |
| Unexpected token , | Trailing comma | Remove trailing comma |
| Unexpected end | Missing bracket | Match {} [] pairs |
| Unexpected token N | JS NaN/Infinity | Use null or string |
| Bad escape | Invalid escape | \" \\ \n etc. |
Use Cases
- REST API: Format server responses for debugging
- Config Files: Validate package.json, tsconfig.json
- NoSQL DB: Inspect MongoDB, Firestore documents
- Log Analysis: Convert JSON logs into readable format
- Webhook Debugging: Analyze GitHub, Slack payloads
💡 Tip: All processing happens in your browser. Safe for API keys and sensitive data — nothing is sent to a server.