What is JSON Formatter?

When JSON data from an API is hard to read, or you can't figure out why there's an error in a JSON config file—this tool is here to help. It formats your JSON text for better readability and instantly detects any syntax errors.

• Real-time syntax checking with error highlighting
• Adjusts indentation and line breaks to make complex data readable
• Choose formatting options like spaces, tabs, or compression based on your needs

Perfect for debugging during development, checking API responses, editing config files, and any other situation where you work with JSON.

How to Use

Paste or type JSON text into the input area. Syntax checking and formatting happen in real-time, and if the JSON is valid, the formatted result appears in the output area.

If there are syntax errors, the problematic sections are highlighted with specific error messages. Use these messages as a guide to quickly fix the issues.

Format Settings

Customize the indentation style to match your readability preferences and use case.

Indent

Choose from three styles depending on your needs.

• Spaces (default) - High readability and commonly used format
• Tab - Tab width can be adjusted in your editor
• None - Removes indentation and line breaks to minimize data size

Indent Spaces

When "Spaces" is selected for indentation, you can specify the number of spaces.

• 2 spaces (default)
• 4 spaces
• 6 spaces
• 8 spaces

Choose according to your project's coding standards or personal preference.

JSON Basics

JSON is a lightweight and readable data format widely used for data exchange. Here are the basic rules:

• Strings are enclosed in "" (double quotation marks)
• Objects are enclosed in {}, arrays in []
• Keys and values are separated by : (colon)
• Multiple data items are separated by , (comma, not needed after the last item)

Simple example:

{
  "name": "John Doe",
  "age": 30,
  "hobbies": ["reading", "traveling"]
}

For more details, see Working with JSON - MDN and JSON - MDN.