JSON Formatter

When you're looking at the raw output of an API response or a database query, JSON is often delivered as a single line with no whitespace — perfectly fine for machines, completely unreadable for humans. Paste that into this formatter and it expands into a structured document where every nested object is indented and every key is on its own line.

Beyond readability, the formatter also validates your JSON as it formats. If a comma is missing, a bracket is mismatched, or a key isn't quoted, the error message tells you exactly where the problem is. That saves a lot of guessing when you're debugging a webhook payload at midnight.

Prettify is for reading. Minify is for shipping. When you're building a request body to paste into Postman, or reviewing a config file, you want the indented version. When you're reducing the size of a static JSON file loaded by a browser, you want the minified version.

This tool does both. Switch between them without touching the input — the formatter keeps your original data intact in the left editor.

The upload button lets you load a JSON file directly from disk instead of copy-pasting. Once formatted, you can download the result back as a file. For very large payloads — API responses with hundreds of records, for example — this is faster than dealing with a browser paste limit.

The editor also persists your last input across page reloads, so you don't lose work if you accidentally close the tab.