JSON Formatter & Validator

JSON is the format the modern web runs on, but the moment something goes wrong — a missing comma, a stray quote, a structure that does not match what your code expects — you need a way to inspect it quickly. This JSON formatter takes any JSON payload you paste in and produces a properly indented, color-coded, tree-style view of its structure. You can expand and collapse nested objects, see at a glance which keys are present at each level, and spot type mismatches in seconds.

Common workflows include pretty-printing a minified API response straight from a network request, validating that a configuration file is well-formed before deploying it, and checking the exact shape of a JSON payload you intend to send to an endpoint. The tool runs entirely in your browser, so even sensitive data — tokens, user records, API keys — never leaves your machine. If your JSON is invalid, the formatter highlights the exact position of the error so you can fix it without scrolling through hundreds of lines.