JSON Formatter & Validator

The Essential Developer Tool for JSON

JSON (JavaScript Object Notation) is the lingua franca of modern APIs. But raw JSON from APIs is often minified — a single unreadable line of text. Our formatter makes it instantly readable.

Features

Format & Beautify Converts compact JSON into properly indented, readable format with 2 or 4 space indentation. Perfect for debugging API responses.

Validate Instantly detects JSON syntax errors and pinpoints exactly which line and character caused the issue. No more hunting through minified output.

Minify Strip all whitespace to create the smallest possible JSON payload. Use this before storing in databases or sending in API requests to reduce bandwidth.

Syntax Highlighting Color-coded display distinguishes keys, strings, numbers, booleans, and null values at a glance.

Common Use Cases

• **Debug API responses** — paste raw API output and immediately see the structure
• **Validate config files** — catch syntax errors in package.json, appsettings.json, etc.
• **Optimize payloads** — minify before sending to reduce request sizes
• **Documentation** — format JSON examples for README files or API docs

JSON Best Practices

1. Always use double quotes for strings (single quotes are invalid JSON)
2. Trailing commas are invalid — remove the last comma in arrays and objects
3. JSON does not support comments — strip them before parsing
4. Use null explicitly, not undefined (undefined is not valid JSON)