Item logo image for MockFill: API Mocking

MockFill: API Mocking

mockfill.com
5.0(

1 rating

)
ExtensionDeveloper Tools7 users
Item media 1 (screenshot) for MockFill: API Mocking

Overview

Intercept and mock HTTP APIs directly in your browser for frontend testing.

Mock and intercept fetch/XHR APIs in your browser with rule-based responses, delays, headers, presets, and quick toggles. MockFill: API Mocking is a developer-focused Chrome extension for mocking HTTP APIs directly in the browser. Test frontend flows without touching backend code: - Simulate success, empty, and error responses - Test loading states with response delays - Validate UI behavior for edge cases - Work faster on localhost, staging, or any web app What you can do: - Intercept both `fetch` and `XMLHttpRequest` calls - Match requests by URL pattern (string or regex) and HTTP method - Configure custom response status, body, headers, and delay - Enable/disable mocking globally or per rule - Reorder rules to control matching priority - Track hit counts for each mock rule - Import/export mock rules as JSON - Import from cURL to create rules quickly - Save presets for different testing scenarios and switch instantly Built for: - Frontend developers - QA engineers - Teams testing API-dependent UI states Why MockFill: API Mocking - No backend changes required - No external proxy setup - Fast, repeatable API testing workflow inside Chrome Privacy: - Rules and settings are stored locally in your browser. - No API payloads are sent to external servers by the extension.

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Details

  • Version
    2.3.1
  • Updated
    February 23, 2026
  • Size
    1.81MiB
  • Languages
    English
  • Developer
    Website
    Email
    fabpicapp@gmail.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

MockFill: API Mocking has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.

MockFill: API Mocking handles the following:

Personally identifiable information

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

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