We do not store your data. All processing happens in your browser.

Static + Browser-Only

Mask API Responses Online

Paste an API response payload and mask common sensitive fields in your browser before sharing it with AI tools, tickets, chats, or documentation.

All processing happens locally in your browser. No server processing required.

Input

Raw API response

Tip: paste text or drag and drop a file here.

Paste or drag and drop a file, then run the tool.

Output

Masked API response

Masked payload will appear here

Use Cases

Why use an API response masking tool?

Use this tool when customer or system data needs to be reviewed, shared, or pasted into prompts, tickets, chats, documents, or vendor workflows without exposing raw personal information first.

  • Mask sensitive JSON fields before sharing payloads externally
  • Redact tokens, secrets, card data, emails, phone numbers, and IDs
  • Keep masking local to the browser instead of sending raw payloads to a backend
  • Useful for support logs, QA payloads, troubleshooting, vendor reviews, and AI prompt preparation

Masking Logic

How to mask sensitive fields in API responses

Mask Payload checks common sensitive field names such as email, phone, clientSecret, accessToken, and cardNumber, then applies pattern-based masking for values such as email addresses and phone numbers embedded in plain text.

  • Field-based masking for common sensitive keys in structured JSON
  • Pattern-based masking for values embedded in strings
  • Pretty-print and copy/download options for clean handoff

Privacy Detail

Does this API response masking tool upload data?

This tool runs as a static browser page. It parses and masks JSON in client-side JavaScript in the current tab. No form submission, fetch request, XMLHttpRequest, or masking API call is used during the masking flow.

  • No form submission is used for the masking flow.
  • No fetch, XMLHttpRequest, or API call runs during masking.
  • The page uses local JavaScript logic, including JSON.parse() and regular expressions.
  • The payload is only written back to the output field unless you copy or download it yourself.
  • The masking flow does not store the payload in browser local storage.

FAQ

Who should use an API response sanitizer?

Does this tool upload JSON anywhere?

No. The masking runs entirely in the browser on the current page.

Can I add custom masking fields?

Yes. Add custom field names such as `eventId`, `renewalDate`, or `internalNote` and mask again.

Who is this tool for?

Mask Payload is for engineers, support teams, QA analysts, operations teams, analytics teams, and compliance workflows that need to review or share structured JSON more safely.

Why local masking matters before you share payloads

Many teams need to paste payloads into AI tools, tickets, chats, bug reports, vendor emails, or internal documentation. A browser-based JSON masking tool helps reduce the chance of exposing raw customer data, secrets, or internal identifiers before that data leaves the original system.

Mask Payload is designed for privacy-first review workflows. It gives teams a fast way to remove or redact common sensitive fields in JSON while keeping the structure readable for debugging, QA, support, and engineering handoff.

Examples

Example input and output

These short examples show the kind of input this page is built for and the kind of cleaned result you can expect before sharing data externally.

Example Input Sample data before masking or extraction 
{"customerId":"cus_812734","email":"john.doe@example.com","phone":"416-123-4567"}
Example Output Sanitized or extracted result 
{"customerId":"****","email":"****","phone":"****"}

Tool Directory

Browse masking tools by category

Find related browser-only masking tools for structured payloads, requests, tokens, config files, logs, infrastructure secrets, web payloads, security review, and practical guides.