JSON Formatter & Validator

Paste messy or minified JSON to instantly validate it and format it with proper indentation. Errors are shown with a clear message so you can fix them fast.

JSON Input

Result

How to Use

Paste your JSON data into the input box.
Click "Format / Beautify" for readable, indented JSON, or "Minify" to compress it into a single line.
If there's a syntax error, the exact problem is displayed so you can fix it quickly.

Why Format JSON?

JSON (JavaScript Object Notation) is the standard data format for APIs, configuration files, and data exchange between applications. Raw JSON returned from an API is often minified into a single unreadable line to save bandwidth. Formatting it with proper indentation makes it far easier to read, debug, and understand the data structure — especially for nested objects and arrays.

Frequently Asked Questions

What causes a "JSON is invalid" error?

Common causes include trailing commas, missing quotes around keys, single quotes instead of double quotes, or unclosed brackets/braces. The error message will point you to the type of problem detected.

Is my JSON data uploaded anywhere?

No, all formatting and validation happens locally in your browser using JavaScript's built-in JSON parser.