How json formatter works
JSON (JavaScript Object Notation) is the standard data format for web APIs and configuration files. Minified JSON, with no spaces or line breaks, is efficient for transmission but hard to read. This formatter parses your JSON and re-serializes it with proper indentation and line breaks.
Enter or paste any JSON string. The formatter parses it using the standard JSON parser (which catches syntax errors like missing commas, unmatched braces, and trailing commas), then re-outputs it with 2-space indentation by default. You can adjust the indent size. If the JSON is invalid, the error message tells you where the problem is.
The formatter preserves the key order of your original JSON. Everything runs in your browser using the built-in JSON.parse and JSON.stringify functions, so your data never leaves your device. It handles arbitrarily large JSON as long as your browser has memory.