JSON Formatter & Validator

Paste your JSON to format, validate, and beautify it instantly. Syntax highlighting, error detection, and one-click copy.

0 chars · 0 lines
Formatted output will appear here...

What Is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write and easy for machines to parse and generate. It is the most widely used format for APIs, configuration files, and data storage across web applications, mobile apps, and backend services.

Why Format JSON?

Raw JSON from APIs or logs is often minified into a single line, making it nearly impossible to read. Formatting JSON with proper indentation and line breaks makes the structure visible at a glance. This tool also validates your JSON and highlights syntax errors with the exact line number, helping you catch missing commas, unmatched brackets, or invalid values before they cause problems in your code.

How to Use This JSON Formatter

  1. Paste your JSON into the input area on the left. The validator instantly checks whether the JSON is valid.
  2. Click Format to beautify the JSON with your chosen indentation (2 spaces, 4 spaces, or tabs).
  3. Click Minify to compress the JSON into a single line, removing all unnecessary whitespace.
  4. Click Copy to copy the formatted output to your clipboard with one click.

Tips for Working with JSON

  • Always use double quotes for keys and string values. Single quotes are not valid in JSON.
  • Trailing commas after the last item in an object or array are not allowed in JSON, even though JavaScript permits them.
  • Use minified JSON for network requests and storage to reduce payload size, and formatted JSON for debugging and documentation.
  • When working with large JSON files, check the character and line count displayed above the output to monitor the size.