JSON Code Formatter
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Free Online JSON Validator & Formatter Tool
Working with JSON data requires both proper formatting and validation to ensure error-free applications. Our all-in-one JSON tool validates your JSON for syntax errors while simultaneously formatting it into a clean, readable structure with proper indentation and syntax highlighting.
Whether you're debugging API responses, editing configuration files, or analyzing complex data structures, this tool helps you catch errors early and maintain perfectly structured JSON.
How to Validate & Format JSON in 3 Steps
- Paste your JSON – Input any JSON string (minified, unformatted, or malformed)
- Click "Validate & Format Code" – Get instant validation results and beautifully formatted output
- Fix errors (if any) – Use detailed error messages to correct your JSON structure
Pro Tip: Validate JSON before processing in your applications to prevent runtime errors.
JSON Validation Features
- Syntax checking – Detect missing commas, brackets, or quotes
- Error pinpointing – Exact line and character position of issues
- Schema validation – Verify JSON structure against your data model
- Strict mode – Flag duplicate keys and other subtle issues
JSON Formatting Features
- Smart indentation – 2-space, 4-space, or tab-based formatting
- Syntax highlighting – Color-coded keys, values, and structures
- Line wrapping – Handle long strings gracefully
Why Validate and Format JSON?
Validation Benefits
- Prevent application crashes from malformed JSON
- Ensure API compatibility and data integrity
- Debug complex nested structures efficiently
Formatting Benefits
- Improve code readability and maintenance
- Simplify collaboration between team members
- Make configuration files easier to manage
Essential Use Cases
- API Development – Validate requests/responses before implementation
- Configuration Management – Check
package.json,tsconfig.jsonfiles - Data Migration – Ensure JSON data integrity during transfers
- Automated Testing – Verify JSON output matches expected schema
- Education – Learn proper JSON syntax through real-time feedback