JSON Formatter & Validator
Format, validate, minify, fold, and inspect JSON locally in your browser.
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ms validate
ms format
Ctrl + Enter Format
Ctrl + Q Fold
JSON formatter usage examples
This JSON formatter is designed for debugging APIs, cleaning up configuration files and reading JSON payloads from logs or third-party services. Formatting and minifying run in your browser and preserve number literals as written.
Common use cases
- Beautify and validate REST API responses returned as a single-line JSON string
- Review JSON configuration blocks used in Kubernetes, microservices or feature flags
- Paste compressed JSON from logs and expand it into a readable structure
- Catch syntax errors, duplicate keys and unsafe JavaScript integer values before sharing JSON
Practical tips
- Use Format or Ctrl+Enter to pretty-print JSON without changing values.
- Use Fold all and Expand all to inspect nested API responses quickly.
- Use Download when you want to save the current JSON as a local file.
JSON text is processed locally in your browser by default; no backend call is required for this tool.