JSON Formatter & Validator

1. Paste your JSON — Copy raw JSON from an API response, config file, or database export and paste it into the input area. You can also upload a .json file or drag & drop it directly.
2. Choose your mode — Select Format to pretty-print with indentation, Minify to compact into one line, or Validate to check for syntax errors. Optionally enable repair options to auto-fix common issues.
3. Click the action button — The tool instantly processes your JSON and shows the result with syntax highlighting, structure stats, and any repairs applied.
4. Copy, download, or explore — Click "Copy" to copy the result, "Download .json" to save the file, or toggle Tree View to explore the JSON structure with collapsible nodes and click-to-copy JSONPath.

JSON (JavaScript Object Notation) is the universal data interchange format used by virtually every API, configuration system, and database in modern development. But raw JSON — especially from API responses or minified config files — is often a wall of text that's nearly impossible to read, debug, or compare.

Our JSON Formatter is a best-in-class, free online tool that combines formatting, validation, minification, and repair in one interface — with features that most competitors charge for or don't offer at all:

• 3 modes in one tool — Format (pretty-print), Minify (compact), and Validate (syntax check with exact error location). No need to open separate tools.
• Auto-repair engine — Automatically fixes trailing commas, single quotes, unquoted keys, and strips JSONC comments (// and /* */). Paste sloppy JavaScript objects or VS Code settings and get valid JSON.
• Recursive key sorting — Alphabetically sort all object keys at every nesting level. Essential for JSON diffing, API consistency, and config file maintenance.
• Data transforms — Remove null values, empty strings, empty arrays/objects, and trim whitespace in string values. Clean your JSON before sending to another service.
• Interactive tree view — Explore your JSON as a collapsible hierarchical tree. Hover over any node to see its JSONPath; click to copy the path to your clipboard. Invaluable for navigating large API responses.
• Syntax highlighting — Keys, strings, numbers, booleans, and nulls are color-coded for instant visual parsing.
• Structure stats — See key count, nesting depth, and data type breakdown (objects, arrays, strings, numbers, booleans, nulls) at a glance.
• Precise error reporting — When validation fails, see the exact line number, column, and a clear description of the syntax error — not just "Unexpected token".

100% browser-based — your data is never uploaded to any server. All processing runs entirely in your browser using JavaScript. No file size limits, no signup, no privacy concerns. Unlike many competitor tools that send your data to a server for processing, your API responses, config files, and sensitive business data stay completely private.

The tool handles JSON files up to 10 MB, supports drag-and-drop file upload, auto-saves your draft in localStorage, and works with .json, .jsonc, .json5, and .geojson files.

• Privacy-first architecture — Most popular JSON formatters send your data to a remote server for processing. Ours runs 100% in your browser. Your API keys, user data, and proprietary business logic never leave your machine. Safe for enterprise use, GDPR compliance, and sensitive data.
• Auto-repair that actually works — Paste a JavaScript object with single quotes, trailing commas, unquoted keys, and comments? Our repair engine handles it all and produces valid JSON. Most competitors just show "Invalid JSON" and give up.
• Tree view with JSONPath — Click any node in the tree view to copy its JSONPath ($.store.book[0].title). No need to manually trace through nested structures. This feature alone saves minutes when working with large API responses.
• 3 tools in one — Format, validate, and minify in one interface. No context-switching between different websites. Your data stays in one place.
• 9 configurable options + 3 presets — From zero-change formatting to aggressive data cleanup (remove nulls, trim strings, sort keys). Full control over what happens to your data.
• No ads, no signup, no tracking — Clean, distraction-free interface. Just paste and format. No popups, no account requirements, no cookie banners blocking your workflow.
• Draft persistence — Your last input is saved in localStorage and restored automatically when you return. Never lose work-in-progress across browser sessions.

• Debugging API responses — Paste a raw API response to instantly see the structure, find the data you need, and copy the JSONPath for your code.
• Editing configuration files — Format tsconfig.json, package.json, .eslintrc.json, or any config file for easier editing. Sort keys for consistency across your team.
• Validating JSON before deployment — Catch syntax errors before they break your application. The validator shows exact line and column numbers so you can fix issues immediately.
• Converting JSONC to JSON — VS Code settings (settings.json), tsconfig.json, and other config files often contain comments. Strip them to produce valid JSON for use in other tools.
• Minifying for production — Compact JSON for API responses, stored data, or config files to reduce payload size and improve transfer speed.
• Comparing JSON documents — Sort keys alphabetically on both documents before comparing. This eliminates false diffs caused by different key ordering and shows only actual data changes.
• Cleaning up database exports — Remove null values, empty strings, and empty containers from exported data before importing into another system.
• Learning JSON syntax — If you're new to JSON, paste any data and see the tree view to understand the structure. The validator teaches you the rules by showing clear error messages.