INPUT - JSON
Output will appear here
100% client-side
Output will appear here
Format and beautify JSON online with our free JSON formatter and validator. Choose 2-space, 4-space, or tab indentation, validate syntax with precise error messages, and sort keys alphabetically. The tool processes everything client-side for speed and privacy, handling files up to several megabytes.
Try Convert All - paste JSON once, see TypeScript, Go, YAML, and 15 more formats instantly.
Enter minified, compact, or messy JSON in the editor. The formatter accepts valid JSON of any size and structure.
Select 2-space, 4-space, or tab indentation from the toolbar. The JSON is reformatted in real time as you change the setting.
Click Copy to grab the perfectly indented JSON, or download it as a .json file with your chosen formatting applied.
The formatter validates your JSON and reports specific syntax errors with line numbers. It does not auto-repair invalid JSON, but the error messages help you locate and fix issues like missing commas, unmatched brackets, or trailing commas quickly.
You can choose between 2 spaces, 4 spaces, or tab characters for indentation. The setting is applied instantly and persists across sessions so you always get your preferred style.
Yes. The formatter runs entirely in your browser using optimized parsing and can handle JSON files of several megabytes without sending data to any server. Performance depends on your device but is typically instant for files under 5 MB.
Yes. You can enable alphabetical key sorting to produce deterministic JSON output. This is useful for version control diffs and comparing JSON documents where key order matters.