mountebank-testing/mountebank

Health v2 · maintenance only

Adoption not part of the score

2106 stars · 291 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Mountebank is an open-source service virtualization tool that creates over-the-wire test doubles for many protocols including HTTP, TCP, gRPC, SMTP, and websockets. It supports stubbing with advanced predicates, mock verification, JavaScript injection, and record-playback proxying.

Use cases

• stub http apis for integration tests
• mock downstream microservices during testing
• virtualize grpc and tcp services
• record and replay api responses via proxying
• verify that my service made expected calls to dependencies
• performance test against a lightweight mock server

When to choose

• you need protocol-diverse service virtualization without commercial licensing
• you test microservices with many downstream dependencies
• you need record-playback proxying or advanced predicate matching

When to avoid

• you only need simple in-process mocks in a unit test framework
• you need a maintained-by-vendor tool, since the project is mid-transition to a new organization

Facets

cli-tool · maturity active

testing mocking http-server cli testing developer-tools apis microservices cross-platform cli service-virtualization test-doubles stubbing protocol-mocking record-playback nodejs

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