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JSON Formatter

Online JSON Formatter and Validator

Input JSON
Formatted Result

JSON Formatter Description

Format, validate and prettify JSON data online. 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.

How to use

  1. Paste your JSON data into the input field.
  2. The tool will automatically format and validate it.
  3. Use the 'Indent' options to adjust the appearance.
  4. Copy the result or clear the input to start over.

Common Scenarios

  • Debugging minified API responses from web services.
  • Formatting configuration files (like package.json) for readability.
  • Verifying the syntax of JSON data before using it in code.

Data Structure & Rules

JSON is built on two structures:

  • Objects: A collection of name/value pairs, wrapped in {}.
  • Arrays: An ordered list of values, wrapped in []. Values can be strings, numbers, objects, arrays, true, false, or null.

Conversion Principles

The tool uses the built-in JSON.parse() to validate the syntax and JSON.stringify() with custom indentation logic to reconstruct the data into a clean, readable format.