nock/nock

Health v2 · maintenance only

Adoption not part of the score

13121 stars · 764 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Nock is an HTTP server mocking and expectations library for Node.js. It intercepts HTTP requests made by code under test and returns predefined responses, enabling isolated testing of modules that perform HTTP requests.

Use cases

• mock HTTP requests in Node.js unit tests
• test a module that calls a third-party API in isolation
• simulate API error responses and delays in tests
• assert that expected HTTP requests were made
• test code that talks to CouchDB or AWS without hitting real services

When to choose

• you write Node.js tests for code that makes HTTP requests
• you need deterministic, offline tests without real network calls
• you want to assert request counts, headers, bodies, and query strings

When to avoid

• you are testing in a browser environment rather than Node.js
• you need to mock non-HTTP protocols like gRPC or WebSockets
• you want end-to-end tests against a real or containerized server

Facets

library · maturity stable

mocking testing http-client testing developer-tools apis web-development http-mocking unit-testing request-interception test-isolation nodejs javascript

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