Format and pretty print JSON with proper indentation. Validate syntax and spot errors with line and column numbers. Optional key sorting for consistent output. No signup. All processing happens in your browser.
JSON formatting (pretty printing) adds indentation and line breaks to compact JSON strings. The result is human-readable code where nested objects and arrays are visually structured. Browsers and APIs parse both formats identically.
Use it when debugging API responses, inspecting config files, learning JSON structure, or preparing data for documentation. Readable JSON is easier to review and edit. Our formatter also validates syntax and reports errors with exact line and column positions.
Pretty print API responses for debugging. Inspect webhook payloads and config files. Validate JSON before sending. Spot malformed data with clear error messages and position.
Format package.json, tsconfig, or other config files. Make JSON exports readable before sharing. Sort keys alphabetically for consistent diffs. Prepare data for documentation.
Understand JSON structure from APIs or databases. Validate sample data. Test parsers with formatted input. Share readable examples in tutorials or support tickets.
Paste minified, compact, or messy JSON into the input area. You can paste from API responses, config files, or any source. The result updates in real time. Invalid JSON shows an error with line and column.
Select 2 spaces, 4 spaces, or tabs for indentation. Enable Sort keys to alphabetize object keys for consistent output. Options apply immediately.
Use Copy to paste the formatted JSON into your editor or API client. Use Download to save as .json. Swap to move output back to input for further edits.
Alphabetically sorted keys make Git diffs cleaner. Enable Sort keys when comparing config versions or tracking changes over time.
Invalid JSON displays the error message plus line and column number. Jump directly to the problem. Fix trailing commas, missing quotes, or unescaped characters.
All formatting happens in your browser. Nothing is sent to any server. Use it for API keys, tokens, or sensitive config data.
Catches syntax errors before you use the data. Shows line and column for quick fixes. Pretty print and validate in one step.
Choose 2 spaces, 4 spaces, or tabs. Optional key sorting for consistent output. Syntax highlighting in the output panel.
Your JSON never leaves your device. No signup, no limits. Works offline after first load. No API keys or rate limits.
Our JSON formatter is free, requires no account, and works on all devices. Your data stays private. Format and validate API responses, config files, or any JSON. No setup, no hassle.
Try it now. Paste your JSON and get instant formatting. Copy or download the result. Invalid JSON? Get clear error messages with exact position to fix it.
Yes. The JSON formatter is completely free. No signup, no limits, no paid features.
Yes. Invalid JSON shows an error message with line and column number. Fix the syntax and the formatter will produce pretty-printed output.
Sort keys alphabetically orders object keys in the output. Useful for consistent diffs, documentation, or when key order does not matter for your use case.
No. All formatting happens in your browser. Your JSON never leaves your device. Nothing is stored or transmitted.
Standard JSON does not support comments. JSONC (JSON with comments) is not supported. Remove comments before pasting, or use a JSONC-specific tool.
Use our JSON minifier tool. Paste the formatted JSON and get a compact version. Both formatter and minifier work in your browser.
