JSON Formatter
Format, validate and beautify JSON data online. Pretty-print or minify JSON with customizable indentation. Free JSON formatter. No signup, runs in your browser.
Formatted JSON will appear here...About this tool
JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data exchange. Our JSON Formatter helps you read, debug, and validate JSON data instantly. All processing happens in your browser.
Whether you're debugging an API response, cleaning up a config file, or validating data structure, this tool formats your JSON with proper indentation and highlights syntax errors with detailed messages.
About this tool
The JSON Formatter lets you paste raw or minified JSON and instantly format it with proper indentation, or minify it for compact transport. It validates your JSON in real time and highlights errors so you can fix malformed data quickly.
Everything runs locally in your browser. Your data is never sent to a server. Use it to debug API responses, clean up configuration files, or prepare JSON payloads for documentation.
Frequently Asked Questions
Does this tool validate JSON?
Yes. When you click Format, the tool parses your JSON using the browser's native JSON.parse(). If the JSON is invalid, you'll see a detailed error message showing exactly what went wrong and where.
What's the difference between Format and Minify?
Format (pretty-print) adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to create the smallest possible output, ideal for APIs and data transfer.
Is my JSON data safe?
Absolutely. All formatting happens in your browser using JavaScript. Your JSON data is never sent to any server. You can verify this in your browser's network tab.