JSON Formatter

Format, validate, and beautify JSON data with syntax highlighting and error detection.

JSON Input

JSON Output 

Formatted JSON will appear here...

JSON Syntax Guide

Data Types

"string" Text enclosed in double quotes
123 Numbers (integers or floats)
true/false Boolean values
null Null value
[...] Arrays
{...} Objects

Structure Rules

Object Properties

{"key": "value", "key2": 123}

Arrays

[1, 2, "three", true]

Nested Structures

{"users": [{"name": "John"}]}

No Comments

{"valid": true} // No comments allowed

JSON Best Practices

Recommended Practices

  • Use Meaningful Keys

    Choose descriptive property names that clearly indicate their purpose.

  • Consistent Formatting

    Use consistent indentation and formatting for better readability.

  • Validate Your JSON

    Always validate JSON before using it in production applications.

  • Use Arrays for Lists

    Use arrays when you have ordered collections of similar items.

Common Mistakes

  • Single Quotes

    JSON requires double quotes for strings - single quotes are invalid.

  • Trailing Commas

    Don't use trailing commas in objects or arrays - they're not allowed in JSON.

  • Comments

    JSON doesn't support comments - remove them before parsing.

  • Undefined Values

    Use null instead of undefined - undefined is not valid JSON.

Common JSON Use Cases

API Responses

Format and validate JSON responses from REST APIs and web services.

API REST

Configuration Files

Clean up and validate configuration files for applications and services.

Config Settings

Data Export

Format exported data from databases and applications for better readability.

Export Data

Debugging

Debug JSON data structures and identify formatting issues quickly.

Debug Error

Data Exchange

Prepare JSON data for sharing between different systems and applications.

Exchange Integration

Learning

Learn JSON syntax and structure with interactive formatting and validation.

Learn Tutorial

Quick Examples