Format JSON
Validates, formats and minimizes JSON payloads. Operates strictly locally.
Purpose and Limits
What this tool does
Provides a secure, local environment to format, validate, or minify sensitive JSON data without sending it to a remote server.
- Input
- Any text that represents a JSON object or array.
- Output
- The parsed and newly formatted JSON, or an exact syntax error.
Notes
- Use the format button for readable pretty-printing (2 spaces).
- Use the minify button to remove unnecessary whitespace for production payloads.
- Syntax errors are displayed with line numbers.
Limitations
- Extremely large JSON files (>50MB) may freeze the browser.
- Comments in JSON are not supported by the strict standard parser.