Mockttp

At a glance

• Editor score
  7.6 / 10
• Pricing
  Open source
• Best for
  Node and TypeScript test developers
• Paid from
  Free
• Dynamic responses
  Yes
• Facts checked
  20 Sep 2026

• Where it wins

  • Matches requests by paths, headers, bodies, hosts, protocols, and URL patterns
  • Supports HTTP, HTTPS, WebSocket, and programmable callback responses
  • Enables inspection, failure simulation, and parallel tests with automatic port setup

• Where it doesn't

  • Its documented ecosystem centers on Node.js, JavaScript, TypeScript, and browsers
  • Advanced scenarios require writing matching rules or callback-based response logic
  • It is focused on HTTP traffic mocking rather than broader test-platform coverage

Our verdict on Mockttp

Mockttp is an open-source JavaScript and TypeScript library for intercepting, transforming, proxying, and testing HTTP traffic. It is designed for developers building browser and Node.js integration tests, local mock servers, or scriptable proxies. The library supports fixed or dynamically assigned ports, transparent HTTP and HTTPS proxying, WebSocket request mocking, and requests made outside the controlling process. TypeScript typings and promise-based asynchronous APIs fit projects that want programmable test infrastructure rather than a standalone interface.

Its strongest capability is the depth of request control. Matching can use paths, query parameters, headers, bodies, hosts, protocols, and URL patterns, while responses can be static text, JSON, files, or callback-generated values. Captured request data supports inspection and verification, and tests can model connection delays, failures, timeouts, and passthrough behavior. Automatic port and URL configuration also supports parallel tests, making Mockttp suitable when a test suite needs both normal responses and controlled failure cases.

Mockttp is a focused fit for teams working in the Node.js, JavaScript, TypeScript, and browser ecosystem. Its open-source model suits developers who want a library they can include directly in test suites or run as a scriptable proxy. Choose it when detailed HTTP matching, dynamic responses, proxying, WebSockets, or request verification matter. Teams seeking broader platform coverage or a less programmable approach should consider a tool aligned with those needs instead.

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Mockttp pricing

Mockttp fact sheet

Mockttp integrations

Mockttp lists 4 integrations on its own site.

• Node.js
• JavaScript
• TypeScript
• Browsers

Alternatives to Mockttp

• BeeceptorA broad API mocking platform with protocol coverage, contract testing, and hosted or self-hosted deployment.9.4
• MockServerA free, open-source choice for teams that need broad, self-hosted API control.9.1
• WireMockA flexible mocking platform spanning hosted, local, CI/CD, Kubernetes, and self-managed use.9.0

See all Mockttp alternatives →

Featured on iTechGuides

Mockttp is listed in our API Mocking Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update