# mountebank-testing/mountebank

Over the wire test doubles

Repository: https://github.com/mountebank-testing/mountebank
Canonical: https://ross.abutalabs.com/products/mountebank
Language: JavaScript
License: MIT
License Family: permissive
Topics: mountebank, service-virtualization, test-automation, testing, test-framework, microservices-testing, mocking, stubbing
Last push: 2026-08-23T03:15:33+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 55, longevity 100
- inputs: {"age_days": 4694, "days_push": 10, "days_rel": 140, "gap_med": 105.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2106, forks 291 (observed 2026-08-28T04:06:13.943644+00:00)

## What it is
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
- artifact type: cli-tool
- maturity: active
- function: testing, mocking, http-server, cli
- domain: testing, developer-tools, apis, microservices
- platform: cross-platform, cli
- tags: service-virtualization, test-doubles, stubbing, protocol-mocking, record-playback, nodejs

## Member repositories
- mountebank-testing/mountebank (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:13.943644+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:54:00.062215+00:00, confidence not recorded.
  - readme: https://github.com/mountebank-testing/mountebank (fetched 2026-08-28T04:06:13.943644+00:00, sha 3f823288efd7)
- Data as of 2026-08-30T08:39:29.467469+00:00.