Format, validate, and minify your JSON data instantly.
Input JSON
Valid JSON
Format, validate, and minify your JSON data instantly.
JSON (JavaScript Object Notation) is the most common data-interchange format on the web. APIs return it, config files use it, and databases store it. But raw JSON — especially from API responses — is often a single unbroken line of text that is nearly impossible to read. A JSON formatter takes that dense string and adds proper indentation, line breaks, and syntax highlighting so you can instantly see the structure: objects, arrays, keys, and values, all neatly organized and color-coded.
JSON formatting is essential in many everyday developer and data workflows:
package.json, tsconfig.json, or any settings file for quick reviewValid JSON must follow strict rules defined in RFC 8259. Common mistakes that make JSON invalid include trailing commas after the last item in an array or object, unquoted keys, single quotes instead of double quotes, and JavaScript-style comments. FileNaut's validator parses your input and pinpoints every error with a line number and description, so you can fix problems in seconds instead of scanning thousands of characters by hand.
A JSON formatter is a read-only beautification tool — it takes JSON input and presents it in a human-readable format with indentation and color coding. A JSON editor, on the other hand, lets you modify values, add or remove keys, and restructure the data. Use FileNaut when you need to quickly read, validate, or share JSON. For complex edits — renaming deeply nested keys, merging objects, or transforming data — reach for a dedicated code editor or IDE with JSON support.