How to Format and Validate JSON Online

JSON (JavaScript Object Notation) is the backbone of modern APIs and configuration files. But when you're debugging, a single-line, minified JSON blob is impossible to read.

The Problem

{"users":[{"name":"Alice","age":30,"email":"alice@example.com"},{"name":"Bob","age":25,"email":"bob@example.com"}]}

That's valid JSON, but try finding Bob's email in there.

The Solution: JSON Formatter

1. Go to the JSON Formatter
2. Paste your JSON
3. Click Format
4. Instantly get beautifully indented, readable JSON:

{
  "users": [
    {
      "name": "Alice",
      "age": 30,
      "email": "alice@example.com"
    },
    {
      "name": "Bob",
      "age": 25,
      "email": "bob@example.com"
    }
  ]
}

Validation

The tool also validates your JSON in real time. If you have a missing comma, unclosed bracket, or trailing comma, it will highlight exactly what's wrong.

Minification

Need to go the other way? Click Minify to compress formatted JSON back to a single line — perfect for API payloads.

Security

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