JSON Formatter

Format, validate and minify JSON with syntax highlighting and error detection.

JSON Formatter takes any JSON string — even an ugly single-line dump from a server log or a malformed snippet from a half-broken API — and turns it into clean, indented, syntax-highlighted output you can actually read. It also flips the other direction, minifying readable JSON down to a single line for embedding in source code, environment variables, or HTTP request bodies. When the JSON is invalid, the tool tells you exactly where and why so you can fix it instead of squinting at line numbers. Because everything runs in your browser, you can safely paste API responses containing tokens, customer data, or internal payloads without sending them to a third-party server. Backend developers use it to inspect production logs without firing up a debugger. Frontend developers use it to format the JSON they are about to drop into a fixture file. Mobile developers use it to verify API contracts. QA engineers use it to read responses captured from network tools. Data analysts use it to make sense of webhook payloads. The tool also supports collapsing and expanding nested objects, which makes it practical to work with deeply nested API responses where the structure is more important than the values.

How JSON Formatter works

JSON Formatter is a free browser-based utility from Salah Tools Hub. It is designed to give you an immediate result without an account, subscription, or upload to a remote server.

Enter your information into the tool after the page loads, review the result, and use the available copy or download controls. Your input stays on your device while the tool is running.