JSON Formatter: How to Format and Validate JSON Data

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 has become the de facto standard for data exchange on the web.

Why Format JSON?

Unformatted JSON can be difficult to read, especially when dealing with complex nested structures. Formatting JSON helps:

Improve readability: Properly indented JSON is much easier to understand

Debug faster: Spot errors quickly in well-formatted data

Validate structure: Ensure your JSON is syntactically correct

Share effectively: Formatted JSON is easier for team members to review

Common JSON Errors

When working with JSON, watch out for these common mistakes:

Trailing commas: JSON doesn't allow trailing commas after the last element

Single quotes: JSON requires double quotes for strings

Unquoted keys: Object keys must be strings in double quotes

Comments: JSON doesn't support comments (use JSON5 if you need them)

JSON Formatting Tips

Use 2 or 4 spaces for indentation

Keep arrays of simple values on one line when appropriate

Order object keys consistently (alphabetically or by importance)

Validate JSON before sending to APIs

Using Our JSON Formatter

Our free JSON formatter tool offers:

Instant formatting with customizable indentation

Syntax validation with error messages

Minification option for production use

Copy-to-clipboard functionality

Dark mode support for comfortable viewing