JSON Formatter
Format, minify, and validate JSON with syntax highlighting.
Input
Format, minify, and validate JSON with syntax highlighting.
A JSON formatter takes raw, minified, or poorly indented JSON data and restructures it into a clean, human-readable format with proper indentation and syntax highlighting. JSON (JavaScript Object Notation) is the most widely used data-interchange format in modern web development, powering REST APIs, configuration files, and database documents. When you receive a compact JSON response from an API or need to debug a deeply nested object, reading the raw text is nearly impossible without formatting. Our free online JSON formatter and validator parses your input entirely inside your browser using the native JSON.parse() function, detects syntax errors instantly, and pretty-prints the result with configurable indentation. No data ever leaves your device, making it safe for API keys, tokens, and other sensitive payloads.
Developers reach for a JSON formatter dozens of times a day. Here are the most common scenarios:
package.json, tsconfig.json, or CI/CD pipeline configs before committingPaste or type your JSON into the editor and the tool validates it in real time. Valid JSON is formatted with your chosen indentation level (two spaces, four spaces, or tabs) and displayed with syntax highlighting that color-codes strings, numbers, booleans, and null values. If the input contains errors, the formatter pinpoints the exact line and character position so you can fix the issue immediately. Everything runs client-side in your browser using standard JavaScript APIs. There are no server round-trips, no data logging, and no sign-up required. Simply open the page and start formatting.