Developer / FREE TOOL
JSON Formatter & Validator
Format, minify and validate JSON locally in a web worker. Choose indentation, see parsing errors and copy or download the formatted result.
Free to useNo loginProcessed on your device
Give your data some room.
LOCAL WORKERBuilt by Md AtaullahQuestions or a custom tool? Get in touch ↗
A quick
how-to.
- Paste JSON up to 1 MB. Your input stays in this tab.
- Choose indentation and select Format, Minify or Validate.
- Review the result, then copy or download it as a JSON file.
Uses standard JSON parsing, not JSON5 or schema validation. Duplicate keys keep the last value. JavaScript numbers can lose precision beyond the safe integer range; quote large identifiers. Output is limited to 4 MB and 100 nesting levels.