MockFill: API Mocking
Intercept and mock HTTP APIs directly in your browser for frontend testing.
As of June 2026, MockFill: API Mocking has 26 users and a 5.00/5 rating from 1 reviews in the Developer Tools category.
Usersup 188.9 percent+188.9%
26
26
Ratingno change0%
5.00
1 reviews
Reviewsno change0%
1
Version
2.3.1
Manifest V3
History
7 snapshotsTracking since Apr 8, 2026.
View as table
| Date | Users | Rating | Reviews | Version |
|---|---|---|---|---|
| Apr 8, 2026 | 9 | 5.00 | 1 | 2.3.1 |
| Apr 19, 2026 | 11 | 5.00 | 1 | 2.3.1 |
| Apr 25, 2026 | 18 | 5.00 | 1 | 2.3.1 |
| May 9, 2026 | 20 | 5.00 | 1 | 2.3.1 |
| May 19, 2026 | 21 | 5.00 | 1 | 2.3.1 |
| May 25, 2026 | 22 | 5.00 | 1 | 2.3.1 |
| Jun 4, 2026 | 25 | 5.00 | 1 | 2.3.1 |
| Now | 26 | 5.00 | 1 | 2.3.1 |
Permissions & access
- Permissions
- storage
- Host access
- http://*/*, https://*/*
Screenshots
About
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.
Technical
- Version
- 2.3.1
- Manifest
- V3
- Size
- 1.81MiB
- Min Chrome
- 90
- Languages
- 1
- Featured
- No
Metadata
- ID
- ibdcndlmccmofmdkhflechalamaeobhh
- Developer ID
- u127dda5168caf73b1a8e0824e6754443
- Developer Email
- [email protected]
- Created
- Feb 22, 2026
- Last Updated (Store)
- Feb 23, 2026
- Last Scraped
- Jun 4, 2026
- Website
- mockfill.com
- Support URL
- https://mockfill.com/support
- Privacy Policy
- https://mockfill.com/privacy
Similar extensions
Alternatives to MockFill: API Mocking, ranked by description similarity.
HTTPMocky
DevTools panel + content script that rewrites fetch/XHR responses
25
★ 5.0
Mock Express - Modify, Mock & Intercept HTTP Requests Locally
Intercept, mock, and modify API requests directly in your browser. No server needed. 100% local and secure.
306
★ 5.0
API Mocker V1
Intercept, modify and mock HTTP requests
16
★ 5.0
mockforme
Instantly mock APIs with zero code using MockForMe extension — fast, simple, and effortless
78
★ 5.0
MockFill – Autofill Forms with Mock/Fake Data
A web form filler that autofills page inputs with realistic dummy data for testing.
805
★ 5.0
Moqyy — API Mocking & Fetch/XHR Interceptor
Mock APIs, intercept fetch/XHR requests, and test frontend apps without backend. Built for frontend developers and QA testers.
100
★ 4.8
RequestMocker
Intercept API calls and return mock responses for development purposes.
2
Intercepta: modify and mock HTTP requests
Intercepts and mocks HTTP requests with custom responses based on user-defined rules for free.
31
★ 5.0
Data sourced from the Chrome Web Store · last verified Jun 4, 2026.