JSON Formatter, Validator & Minifier: Clean JSON in Your Browser
Format, validate, and minify JSON with VS Code-style syntax highlighting, error line detection, and a diff view. Ideal for API debugging, config editing, and cleaning minified payloads from logs.
Key Features
- Pretty-print with 2-space, 4-space, or tab indentation
- Validate syntax with exact line and column error reporting
- Minify JSON and compare byte savings
- Collapsible tree view for large nested objects
- Diff tab comparing input vs formatted output
Common Use Cases
- Beautify API responses from curl or browser devtools
- Find missing commas or trailing commas before deployment
- Minify JSON config for production bundles
- Compare original vs cleaned JSON during code review
- Teach JSON structure with readable indentation
Benefits
- No file size limits beyond browser memory
- Nothing uploaded — safe for proprietary API payloads
- Instant feedback on every keystroke
- Works offline once the page is loaded
Why format JSON?
API responses and config files are often minified or poorly indented, which makes them hard to read and debug. A formatter adds consistent spacing and line breaks so you can scan keys, spot missing commas, and compare values quickly.
This tool runs entirely in your browser — your JSON never leaves your device.
Format, validate, and minify
Use Format to beautify JSON with 2-space, 4-space, or tab indentation and explore collapsible nodes. Validate checks syntax and reports the exact line and column of errors. Minify removes whitespace for smaller payloads and shows how much space you saved.
The Diff tab compares your input against the formatted output so you can see what changed after cleanup.
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