JSON Formatter & Validator

Format, validate, and minify JSON data

Input JSON

Output

How to Format JSON

Paste JSON: Paste your messy or minified JSON string into the left text area.
Format: Click the "Format" button to beautify the JSON with proper indentation and line breaks.
Validate: The tool automatically checks if your JSON is valid. Look for the "Valid JSON" indicator.
Minify: Click "Minify" to remove all whitespace and make the JSON as small as possible.

Features

Validation: Instantly detects syntax errors and points out where they are.
Beautify: Transforms raw JSON into a readable, tree-like structure with 2-space indentation.
Minification: Compresses JSON for production use or to save bandwidth.
Local Processing: All parsing happens in your browser; no data is sent to any server.

Why Use This JSON Tool?

Instant Validation: Catch missing quotes, trailing commas, and other syntax issues immediately.
Readable Output: Transform minified API responses into neatly indented, collapsible JSON.
Production Ready: Minify JSON to reduce payload size for web and mobile apps.
Private & Fast: All parsing runs locally in your browser. No data is sent to a server.

Common Use Cases

API Development: Debug JSON payloads from REST or GraphQL APIs.
Configuration Files: Clean up and validate settings.json, package.json, and app configs.
Data Exchange: Format JSON for reports, imports, or database seed scripts.
Learning JSON: See errors clearly explained, making it easier to learn the syntax.

FAQ

Why is my JSON invalid?

Common reasons include missing quotes around keys (e.g., {name: "John"} instead of {"name": "John"}), trailing commas, or using single quotes instead of double quotes.

What does the minify option do?

Minify removes all unnecessary whitespace and line breaks, producing the smallest valid JSON string for production use.

Is my data safe?

Yes. This tool runs entirely on the client side in your web browser. Your sensitive data is never transmitted over the internet.

Can I format large JSON files?

Yes, but extremely large files may slow down your browser. Most files under a few megabytes process instantly.