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Format and validate JSON

Parse, validate and format JSON locally in your browser.

About this page

Parse, validate and format JSON locally in your browser.

How to use it

  1. Paste a representative copy of the source rather than the only original.
  2. Run the formatter, preview or comparison locally.
  3. Review syntax errors, changed lines, indentation and data types in context.
  4. Validate and test the output with the schema, parser or application that will actually use it.

How to interpret the result

Format and validate JSON improves inspection and can identify structural problems, but readable output is not automatically semantically correct or safe to deploy.

Privacy and limitations

Formatting and visual comparison do not replace schema validation, code review, security review, automated tests or application-specific checks.

Recommended next step

Correct the first reported problem, run the tool again and test the final output in a non-production environment.