{ } JSON Formatter

Pretty-print, minify, and validate JSON. Free, instant, 100% private — all processing happens in your browser.

About JSON Formatter

JSON (JavaScript Object Notation) is the standard data format for APIs, config files, and web applications. Our formatter helps you:

  • Pretty Print: Add indentation and line breaks for readability
  • Minify: Remove all whitespace for smallest file size
  • Validate: Check for syntax errors with line numbers
  • Sort Keys: Alphabetically sort object keys

🔒 All processing happens in your browser. Your JSON data never leaves your device.

About JSON Formatter

Pretty-print, validate, minify, and sort JSON data. Paste messy JSON and get clean, indented output instantly. All processing happens in your browser — your JSON data never leaves your device.

Pretty Print

Format JSON with 2-space or 4-space indentation. Makes nested objects and arrays readable at a glance.

Validation

Instantly detect syntax errors with line-level error messages. Fix missing commas, brackets, and quotes.

Minify & Sort

Compact JSON to single line for production. Sort keys alphabetically for consistent formatting.

100% Private

All processing in-browser with JavaScript. No server upload, no data collection, no tracking.

📋 Common Use Cases

Debugging API Responses

Paste raw API response JSON to pretty-print and inspect nested structures when troubleshooting endpoint output.

Preparing Configuration Files

Format minified JSON configs from package.json or docker-compose files into human-readable layouts for editing.

Validating JSON Before Deployment

Run a syntax check on JSON files before pushing to production to catch trailing commas, missing brackets, or invalid types.

Compressing JSON for Storage

Minify bulky JSON payloads to reduce file size when storing logs or transferring data over bandwidth-constrained connections.

🪜 How to Use This Tool

  1. Paste or type your JSON
    Copy any JSON string and paste it into the input area — the tool accepts raw text from any source.
  2. Choose a mode
    Select Format for pretty-printing, Validate to check syntax only, or Minify to compress the output.
  3. Review errors if any
    Invalid JSON highlights the exact line and character where the parser found a problem, with a plain-English hint.
  4. Copy the result
    Use the copy button to grab formatted, validated, or minified output and paste it wherever you need.

📚 Related Guides

Frequently Asked Questions

Is this data tool free?▼
Yes. All data tools are completely free. No signup needed.
Is my data sent to a server?▼
No. All data processing happens in your browser. Your JSON, CSV, SQL, and text data never leaves your device.
Can these handle large files?▼
JSON formatter and CSV tools comfortably handle files up to ~10MB in browser. Performance depends on your device for larger datasets.

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