JSON Formatter & Validator

About this tool

JSON (JavaScript Object Notation) is the language of the web APIs. However, unformatted JSON is nearly impossible for humans to read. Our JSON Formatter & Validator makes it readable, debuggable, and usable.

Whether you are debugging a backend API, editing a config file, or just checking if your syntax is valid, this tool helps you. Unlike other formatters that send your data to a server, ours processes everything locally in your browser, ensuring your private keys and data remain secure.

We include a strict validator that points out exactly where your syntax error is—whether it's a missing comma, an unclosed brace, or an invalid character.

Usage examples

{"a":1} → 
{
  "a": 1
}

{
 "a": 1 
} → {"a":1}

{"a":1, "b":} → Error: Unexpected token }

How to use

1. Paste your JSON string into the input editor.
2. The tool will automatically validate the syntax.
3. Select "Format" to beautify (Pretty Print) with indentation.
4. Select "Minify" to remove whitespace for production use.
5. Click "Copy" to use the result in your code.
6. If errors exist, check the status message for the line number.

Benefits

• Instant Validation & Error Reporting
• Beautify / Pretty Print (2-space or 4-space indentation)
• Minify / Compress JSON
• Local processing (Privacy focused)
• Handles large JSON files text
• Detects trailing commas and common mistakes
• Essential for API developers

FAQs