JSON Formatter

Format and Validate JSON Online — Free

Paste in messy or minified JSON and get it back cleanly indented and readable — with clear error messages if anything's actually broken.

How to Format JSON

Paste your JSON into the box and it's formatted instantly, with consistent indentation and line breaks that make nested objects and arrays easy to read. If the JSON isn't valid, an error points you toward roughly where the problem is, rather than leaving you to guess.

Why Formatting Matters

JSON returned by an API or squeezed into a config file is often minified into one dense, unreadable line to save space — great for machines, painful for people. Formatting it back out with proper indentation makes it possible to actually read the structure: which keys belong to which object, where an array starts and ends, and where a stray comma or missing bracket might be hiding.

Good Uses for This Tool

Making sense of a minified API response while debugging, checking whether a JSON file is valid before using it, cleaning up a config file for readability, or double-checking the structure of JSON before pasting it into code.

Is It Actually Private?

Yes. Formatting and validation both happen entirely in your browser — your JSON is never sent to a server.