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WireMock — isolate tests from external HTTP APIs with controllable stubs

OSS scale score 274.7OSS health 82Update pace 32 commits/30d
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OSS scale score is an unbounded metric that log-compresses and weights Stars, Watchers, Forks, and Contributors. Discovery score is the current OSS scale score minus the score at discovery. Update pace is commits in the last 30 days, growth momentum is the OSS scale score difference within the recent observation window, and OSS health is a 0–100 rating based on available recency, Community Health, and release data.

Stars
7,375
Primary language
Java
License
Apache-2.0
Repository last updated
Sep 18, 2026

Overview

WireMock is an API-mocking and service-virtualization tool that matches HTTP requests by URL, headers, body, and other properties and returns configured responses. It can run as a Java library, standalone server, or container and supports delays, faults, record/playback, request verification, and stateful behavior.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Stub HTTP responses from precise request conditions

URL, method, header, and body matching can drive configurable response status, headers, and body content.

Sources: [2][4]

Simulate latency, faults, and recorded upstream behavior

Delay and fault injection, traffic record/playback, proxying, and request verification support both normal and failure scenarios.

Sources: [2][4]

For stable integration and component tests around external APIs

WireMock fits tests that must proceed even when third-party services are unfinished, flaky, costly, or rate-limited.

Sources: [2]

Continuously validate mock behavior against the real service contract

Mocks can drift away from upstream APIs. Pair stubs with contract/OpenAPI validation or periodic real-endpoint tests so local behavior does not become stale.

Sources: [4]

Official sources

  1. [1]wiremock/wiremock repository(2026-09-20)
  2. [2]WireMock README(2026-09-20)
  3. [3]WireMock Apache-2.0 license(2026-09-20)
  4. [4]WireMock documentation(2026-09-20)
Supplemental curator note

WireMock helps keep tests deterministic when upstream APIs are unavailable, unstable, costly, or rate-limited by replacing them with controllable local HTTP behavior. The OSS project is Apache-2.0; advanced WireMock Cloud capabilities mentioned in the README are a separate service.

Try it in 3 steps

  1. 1

    Start the standalone WireMock container

    Start WireMock with the HTTP port exposed only on localhost.

    docker run --name wiremock-demo --rm -d -p 127.0.0.1:8080:8080 wiremock/wiremock:latest
  2. 2

    Register a GET /hello stub

    Use the Admin API to define one request matcher and deterministic response.

    curl -sS -X POST http://127.0.0.1:8080/__admin/mappings -H 'Content-Type: application/json' -d '{"request":{"method":"GET","url":"/hello"},"response":{"status":200,"body":"hello"}}'
  3. 3

    Call the mocked endpoint

    Verify that 200/hello is returned without a real upstream service.

    curl -i http://127.0.0.1:8080/hello
Check the official README

Growth

Growth trends · Last 30 days

7,375 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
32
Open PRs
71
Issues opened
11
Issues closed
3
PRs opened
104
PRs merged
59

Issues

11 / 3

Jun 23Sep 20
Issues openedIssues closed

Pull requests

104 / 59

Jun 23Sep 20
PRs openedPRs merged

Maintenance

Median first response
9.1 days
Issue response rate
9.1% (1/11)

Based on up to the 100 newest issues opened by external users in the last 90 days. A first comment from an OWNER, MEMBER, or COLLABORATOR counts as a response; issues whose full comment history cannot be checked are excluded. The median and response rate update weekly.

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GitHub data

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GitHub Topics

  • wiremock
  • json
  • mocking
  • stubbing
  • java
  • xml
  • rest
  • http
  • apis
  • mock-server
  • hacktoberfest
Stars
7,375
Forks
1,518
Watchers
133
Open issues
431
Contributors
247
Primary language
Java
License
Apache-2.0
Repository last updated
Sep 18, 2026
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