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JSON Masking Tool

Masks and anonymizes keys, strings, and numbers within the browser while preserving the JSON hierarchical structure.

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About this tool

Before sharing API responses or configuration data, you can replace sensitive information in key names and values with alternative values.

Features

  • Standard JSON objects and arrays
  • Masking/anonymization and indentation of keys, strings, and numbers

How to use

  1. Paste the JSON into the input field.
  2. Select the indent width and masking target.
  3. Check the masking results and number of items and copy.
  4. You can remove masking individually by right-clicking on the target area of the masking result, and reapply by right-clicking again.

Limitations

  • JSON5 format containing comments and trailing commas is not supported.
  • Please correct the syntax so that it can be parsed as JSON before processing.

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Guides and troubleshooting

Privacy: The input contents and processing results are processed within the browser and are not sent to or saved on the Develop Tools server.