JSON Formatter & Validator

Format, prettify and validate JSON instantly — with syntax highlighting

Input JSON
Formatted Output
Ready — paste JSON and click Format
How to Use the JSON Formatter
1
Paste your JSON into the left input area
2
Click Format / Prettify to beautify with indentation and syntax highlighting
3
Use Minify to compress JSON into a single line for production
4
Click Copy Output to copy the formatted result
About This JSON Formatter

JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data exchange. Our free JSON formatter prettifies compressed JSON into a readable, indented format with syntax highlighting. It also validates your JSON and pinpoints exact syntax errors.

Use the minifier to compress formatted JSON back into a single line for storage or transmission, reducing file size. The formatter works entirely in your browser — no JSON data is sent to any server.

Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight text-based data format. It uses key-value pairs and arrays to represent structured data. It's the standard format for REST APIs, configuration files, and data storage across almost all programming languages.
Common JSON errors include: trailing commas after the last element, missing quotes around property names, using single quotes instead of double quotes, unescaped special characters, and missing colons between keys and values.
JSON is a text format derived from JavaScript object syntax but is language-independent. JSON requires all keys to be double-quoted strings and does not support functions, undefined, or comments. JavaScript objects are more flexible.