JSON Formatter

The JSON Formatter is an online tool for formatting, validating, and minifying JSON directly in your browser. If you have ever received a JSON string with no whitespace — from an API response, a log file, or a database export — you know how hard it is to read in its raw state. With a single click, this tool transforms any compressed JSON into a properly indented block with clear hierarchy and syntax highlighting.

To use it, paste your JSON into the input field and the formatted result appears instantly. You can adjust the indentation size (2 or 4 spaces are the most common conventions) and also minify the JSON back to a single line — useful when you need to embed it in an environment variable or an HTTP request payload.

The tool validates your JSON as you type. If the structure is invalid — a trailing comma, an unclosed bracket, a mismatched quote — a clear error message appears immediately, pointing to where the problem is. This dramatically speeds up debugging compared to manually hunting through hundreds of characters.

Common use cases: inspecting API responses during development, formatting payloads before adding them to documentation, debugging webhook integrations, and comparing two JSON objects side by side. Everything happens entirely in your browser — no data is sent to any server. No account or installation required.