What types of data can be masked?

The tool can mask emails, phone numbers, credit cards, names, addresses, and custom patterns.

Is the masking reversible?

No, masking is a one-way process. The original data is not recoverable from the masked output.

Can I define custom masking rules?

Yes, you can define regex patterns and replacement rules for custom data masking requirements.

JSON Mask - Online Data Masking

How to Use

Paste JSON data containing sensitive information into the input box.
Enter the field names to mask in the fields input box, separated by commas.
Click the "Mask" button. Specified field values will be replaced with masked forms.
Masked data is processed entirely in the browser and never uploaded to any server.

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About JSON Mask

JSON Mask is a free online tool that helps you mask sensitive fields in JSON data. In data testing, development debugging, and logging scenarios, we often need to hide or replace personal information such as phone numbers, emails, and passwords.

This tool supports customizing which field names to mask, with intelligent masking of specified field values. All processing is done locally in the browser without uploading data to any server, ensuring your sensitive data remains secure. Suitable for API response masking, test data generation, log masking, and more.