JSON Formatter & Validator

What is JSON?

// Format (pretty-print) JSON with 2-space indentation
const raw = '{"name":"Alice","age":30,"active":true}';
const parsed = JSON.parse(raw);        // parse string → object
const formatted = JSON.stringify(parsed, null, 2);
console.log(formatted);
// → {
//     "name": "Alice",
//     "age": 30,
//     "active": true
//   }

// Minify JSON (strip all whitespace)
const minified = JSON.stringify(parsed);
console.log(minified);
// → '{"name":"Alice","age":30,"active":true}'

Key Features

Examples

{"status":200,"data":{"user":{"id":"usr_2x7kP9","name":"Alice Chen","email":"alice@example.com","roles":["admin","editor"],"lastLogin":"2026-03-12T08:30:00Z"},"meta":{"requestId":"req_abc123","timestamp":1741776600}}}

{"name":"my-app","version":"2.1.0","private":true,"scripts":{"dev":"next dev","build":"next build","start":"next start","lint":"eslint ."},"dependencies":{"react":"^18.2.0","next":"14.1.0"},"devDependencies":{"typescript":"^5.3.0","eslint":"^8.56.0"}}

[{"id":1,"product":"Laptop Pro","price":1299.99,"inStock":true,"tags":["electronics","computers"]},{"id":2,"product":"Wireless Mouse","price":29.99,"inStock":false,"tags":["electronics","accessories"]},{"id":3,"product":"USB-C Hub","price":49.99,"inStock":true,"tags":["electronics","accessories"]}]

{"database":{"host":"localhost","port":5432,"name":"mydb","pool":{"min":2,"max":10}},"cache":{"enabled":true,"ttl":3600,"provider":"redis"},"logging":{"level":"info","format":"json","outputs":["stdout","file"]}}

How to Use

1. 1

   Paste Your JSON

   Enter or paste your raw JSON data into the input field above. You can also click 'Load example' to try a sample.

2. 2

   Format or Minify

   Click 'Format JSON' to pretty-print with indentation, or 'Minify JSON' to compress into a single line.

3. 3

   Copy the Result

   The processed result appears in the output area. Click 'Copy' to copy it to your clipboard instantly.

Common JSON Errors

{"name": "Alice", "age": 30,}

{"name": "Alice", "age": 30}

{'name': 'Alice'}

{"name": "Alice"}

{name: "Alice"}

{"name": "Alice"}

{"name": "Alice" // user name}

{"name": "Alice"}

{"users": [{"name": "Alice"}

{"users": [{"name": "Alice"}]}

{"name": "Alice" "age": 30}

{"name": "Alice", "age": 30}

Common Use Cases

API Response Debugging

Format minified API responses into readable JSON for quick debugging and inspection.

Configuration Files

Validate and beautify config files like package.json, tsconfig.json, and .eslintrc.

Data Inspection

Explore and understand JSON data exported from databases, logs, or third-party services.

Code Review

Format JSON snippets for clearer diffs and easier comparison during code reviews.

Documentation

Generate neatly formatted JSON examples for technical documentation and tutorials.

Data Migration

Validate JSON structure and syntax before importing data into new systems.

Technical Details

RFC 8259 Compliant

Full support for the standard JSON specification including Unicode and escaped characters.

Browser-Based Processing

All formatting runs locally in your browser using native JSON.parse() and JSON.stringify().

File Size Support

Handles JSON files up to 10MB with configurable indentation (2 or 4 spaces).

Best Practices

Validate Before Use

Always validate JSON data before using it in production to catch syntax errors early.

Use Consistent Indentation

Stick to 2-space indent for readability and smaller file sizes in version control.

Minify for Production

Use minified JSON in API responses and config files to reduce bandwidth and load time.

Frequently Asked Questions