JSON (JavaScript Object Notation) is the most widely used data format for APIs and configuration files. Our free JSON Formatter lets you paste raw or minified JSON and instantly pretty-print it with proper indentation, minify it for production use, or validate it to catch syntax errors before they cause problems in your code.
Use this formatter when debugging API responses, editing config files, or preparing JSON payloads. It is especially helpful for inspecting deeply nested objects that are hard to read in minified form. All processing happens locally in your browser, so your data is never sent to any server.
Frequently Asked Questions
What indentation does the formatter use?
The formatter uses 2-space indentation, which is the most common convention for JSON files in modern development workflows.
Can this tool handle large JSON files?
Yes, the tool works entirely in your browser and can handle JSON data up to several megabytes. Very large files may take a moment to process depending on your device.
Does the validator show which line has the error?
Yes, the browser's JSON parser provides error messages that typically include the position or line number where the syntax error was detected.
Is my JSON data sent to any server?
No. All formatting, minification, and validation happen entirely in your browser using JavaScript. Your data never leaves your device.
Can I format JSON with comments?
Standard JSON does not support comments. If your data contains comments (like JSONC), you will need to remove them before formatting. The validator will flag comments as syntax errors.