JSON Formatter
Paste JSON to format and validate. All processing in your browser.
Try it with this example
Paste {"name":"John","age":30} and click Format to pretty-print. Click Minify to compact it to one line.
What is this tool?
JSON (JavaScript Object Notation) is a lightweight data format that has become the standard for exchanging data on the web. Nearly every modern API returns JSON, configuration files use it, and databases store it. When you receive JSON from an API or config file, it often arrives minified—squeezed into a single line with no indentation or line breaks. That makes it efficient for transmission but nearly impossible for humans to read. This JSON Formatter tool solves that problem instantly.
Simply paste your JSON into the input box and click Format. The tool will add proper indentation and line breaks, making nested structures easy to follow. If the JSON has syntax errors—a missing comma, an extra bracket, or an unquoted key—the formatter will detect them and report the issue. That alone saves hours when debugging API responses or config files. The tool runs entirely in your browser: your data never leaves your device. There are no API keys, no signup, and no server-side processing.
Beyond formatting, the tool also offers a Minify option. When you're ready to ship code or send a payload, minified JSON reduces file size by removing all unnecessary whitespace. Many build tools and APIs expect compact JSON, and this tool gives you both views: human-readable for editing and minified for production. Developers use it to validate JSON before sending it to an API, to inspect responses from fetch or curl, or to clean up exported data before importing it elsewhere.
JSON is built on two structures: objects (key-value pairs in curly braces) and arrays (ordered lists in square brackets). Values can be strings, numbers, booleans, null, or nested objects and arrays. The formatter helps you see that structure clearly. Whether you're working with a small config object or a massive API response with hundreds of keys, the formatted output makes it easy to spot the data you need. No more squinting at a single-line blob of text.
If you're new to JSON, the tool doubles as a learning aid. Paste valid JSON and format it to see how objects and arrays nest. Try removing a comma or bracket and see the validation catch the error. For experienced developers, it's a daily utility—quick, reliable, and always available. Keep it bookmarked for the next time you're debugging an API or cleaning up a config file.