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JSON Formatter
Format, beautify, and validate JSON data online. Our JSON formatter adds proper indentation and syntax highlighting to make JSON easy to read and debug.
Features
- Format: Beautify JSON with proper indentation
- Validate: Check JSON syntax for errors
- Minify: Remove whitespace for production
- Syntax Highlighting: Color-coded keys, values, and types
- Statistics: View size, line count, and validation status
- Copy: One-click copy to clipboard
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's widely used in web APIs, configuration files, and data storage.
JSON Syntax Rules
- Data is in name/value pairs
- Data is separated by commas
- Curly braces {} hold objects
- Square brackets [] hold arrays
- Keys must be strings in double quotes
- Values can be: string, number, boolean, null, object, or array
Common Use Cases
- Debugging API responses
- Formatting configuration files
- Validating JSON before deployment
- Converting minified JSON to readable format
- Learning JSON structure
- Preparing JSON for documentation
Format vs Minify
Format (Beautify): Adds indentation and line breaks for readability. Use during development and debugging.
Minify: Removes all whitespace to reduce file size. Use in production to save bandwidth.
Common JSON Formatting Use Cases
- Debugging REST API responses during development
- Validating JSON configuration files before deployment
- Cleaning up JSON copied from documentation or Stack Overflow
- Minifying JSON for production bundles to reduce file size
- Understanding the structure of unfamiliar JSON data
- Checking JSON from database exports and data pipelines
- Verifying JSON payloads in webhook integrations
All formatting and validation happens entirely in your browser. No data is sent to any server, making it safe to paste production API responses, tokens, and configuration files containing sensitive values.
Examples
Example 1: Beautifying a Minified API Response
You call a REST API and get back a minified JSON string that is impossible to read at a glance. Paste it into the formatter and get clean, indented output immediately.
Input (minified):
{"user":{"id":1042,"name":"Alice","email":"alice@example.com","roles":["admin","editor"],"address":{"city":"New York","zip":"10001"}}}Output (formatted with 2-space indentation):
{
"user": {
"id": 1042,
"name": "Alice",
"email": "alice@example.com",
"roles": [
"admin",
"editor"
],
"address": {
"city": "New York",
"zip": "10001"
}
}
}The nested structure is now immediately visible. You can see the user object contains a roles array and a nested address object. This kind of clarity is invaluable when debugging API integrations.
Example 2: Validating JSON with a Syntax Error
You copy a JSON snippet from a config file and paste it into the formatter. The tool immediately flags a syntax error.
{
"database": {
"host": "localhost",
"port": 5432,
"name": "mydb",
}
}The formatter reports: Error at line 6, column 3 — trailing comma before closing brace. This is one of the most common JSON mistakes. Standard JSON does not allow trailing commas, even though JavaScript and many config parsers do. The formatter catches this before it causes a runtime error in production.
Example 3: Formatting a package.json File
A Node.js developer pastes their package.json to check its structure after a manual edit:
{
"name": "my-app",
"version": "1.0.0",
"scripts": {
"start": "node index.js",
"test": "jest --run",
"build": "webpack --mode production"
},
"dependencies": {
"express": "^4.18.2",
"lodash": "^4.17.21"
},
"devDependencies": {
"jest": "^29.0.0",
"webpack": "^5.88.0"
}
}The formatter confirms the JSON is valid and displays it with consistent 2-space indentation. The developer can now see the full structure clearly and verify all keys are correct before committing.
Frequently Asked Questions
Paste your JSON into the formatter, and it will automatically format and beautify it with proper indentation and syntax highlighting. The tool validates JSON syntax and shows errors if the JSON is invalid.
JSON formatting (or beautifying) adds proper indentation, line breaks, and spacing to make JSON data human-readable. It converts minified JSON into a structured, easy-to-read format without changing the data.
Yes, our JSON formatter automatically validates JSON syntax. If your JSON is invalid, it will show an error message indicating what's wrong. Valid JSON will be formatted with syntax highlighting.
Click the 'Minify' button to remove all whitespace and line breaks from your JSON. Minified JSON is compact and ideal for production use, reducing file size and bandwidth.