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Tags / Testing /

Mocking

Library or server that creates mocks, stubs, fakes, or mock HTTP APIs for tests.

The 69repositories with this Tag gained +4,394 net stars in the last 30 days, 6% less than the 30 days before.

0 created in the last 90 days · 21 published a release in the last 30 days · 530K stars in total

All in the Repository Index On Trending

Net stars each day, last 30 days+2,201 last 7 days

Oct 5, 2026Nov 3, 2026

  • Seed Dataset
  • Rising Admissions

Most net stars, last 30 days

floci-io/floci

Light, fluffy, and always free - The AWS Local Emulator alternative

+2,440

56% of the net stars of this Tag

Largest Pace, last 30 days

keploy/keploy

Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.

4.2×

+806 net stars, against +193 in the 30 days before

Most stars, created in the last 90 days

No other repository with this Tag was created in the last 90 days.

Where the stars went, last 13 weeks

Net stars gained each week. The repositories that gained the most have their own color.

floci-io/floci gained 66% of the net stars of this Tag in the last 13 weeks.

floci-io/floci, week to Aug 11: +1,387 net starskeploy/keploy, week to Aug 11: +48 net starsgoogle/googletest, week to Aug 11: +33 net starsaxllent/mailpit, week to Aug 11: +64 net starsmswjs/msw, week to Aug 11: +34 net starsAll other repositories, week to Aug 11: +175 net starsfloci-io/floci, week to Aug 18: +897 net starskeploy/keploy, week to Aug 18: +42 net starsgoogle/googletest, week to Aug 18: +27 net starsaxllent/mailpit, week to Aug 18: +63 net starsmswjs/msw, week to Aug 18: +12 net starsAll other repositories, week to Aug 18: +174 net starsfloci-io/floci, week to Aug 25: +1,774 net starskeploy/keploy, week to Aug 25: +47 net starsgoogle/googletest, week to Aug 25: +36 net starsaxllent/mailpit, week to Aug 25: +53 net starsmswjs/msw, week to Aug 25: +18 net starsAll other repositories, week to Aug 25: +178 net starsfloci-io/floci, week to Sep 1: +743 net starskeploy/keploy, week to Sep 1: +50 net starsgoogle/googletest, week to Sep 1: +487 net starsaxllent/mailpit, week to Sep 1: +47 net starsmswjs/msw, week to Sep 1: +17 net starsAll other repositories, week to Sep 1: +188 net starsfloci-io/floci, week to Sep 8: +770 net starskeploy/keploy, week to Sep 8: +39 net starsgoogle/googletest, week to Sep 8: +74 net starsaxllent/mailpit, week to Sep 8: +79 net starsmswjs/msw, week to Sep 8: +21 net starsAll other repositories, week to Sep 8: +192 net starsfloci-io/floci, week to Sep 15: +571 net starskeploy/keploy, week to Sep 15: +37 net starsgoogle/googletest, week to Sep 15: +48 net starsaxllent/mailpit, week to Sep 15: +46 net starsmswjs/msw, week to Sep 15: +10 net starsAll other repositories, week to Sep 15: +187 net starsfloci-io/floci, week to Sep 22: +930 net starskeploy/keploy, week to Sep 22: +37 net starsgoogle/googletest, week to Sep 22: +42 net starsaxllent/mailpit, week to Sep 22: +54 net starsmswjs/msw, week to Sep 22: +17 net starsAll other repositories, week to Sep 22: +170 net starsfloci-io/floci, week to Sep 29: +881 net starskeploy/keploy, week to Sep 29: +55 net starsgoogle/googletest, week to Sep 29: +30 net starsaxllent/mailpit, week to Sep 29: +78 net starsmswjs/msw, week to Sep 29: +22 net starsAll other repositories, week to Sep 29: +155 net starsfloci-io/floci, week to Oct 6: +427 net starskeploy/keploy, week to Oct 6: +59 net starsgoogle/googletest, week to Oct 6: +41 net starsaxllent/mailpit, week to Oct 6: +69 net starsmswjs/msw, week to Oct 6: +35 net starsAll other repositories, week to Oct 6: +141 net starsfloci-io/floci, week to Oct 13: +286 net starskeploy/keploy, week to Oct 13: +56 net starsgoogle/googletest, week to Oct 13: +30 net starsaxllent/mailpit, week to Oct 13: +82 net starsmswjs/msw, week to Oct 13: +27 net starsAll other repositories, week to Oct 13: +205 net starsfloci-io/floci, week to Oct 20: +205 net starskeploy/keploy, week to Oct 20: +113 net starsgoogle/googletest, week to Oct 20: +38 net starsaxllent/mailpit, week to Oct 20: +73 net starsmswjs/msw, week to Oct 20: +18 net starsAll other repositories, week to Oct 20: +165 net starsfloci-io/floci, week to Oct 27: +232 net starskeploy/keploy, week to Oct 27: +141 net starsgoogle/googletest, week to Oct 27: +24 net starsaxllent/mailpit, week to Oct 27: +67 net starsmswjs/msw, week to Oct 27: +15 net starsAll other repositories, week to Oct 27: +143 net starsfloci-io/floci, week to Nov 3: +1,558 net starskeploy/keploy, week to Nov 3: +483 net starsgoogle/googletest, week to Nov 3: +30 net starsaxllent/mailpit, week to Nov 3: +52 net starsmswjs/msw, week to Nov 3: +15 net starsAll other repositories, week to Nov 3: +63 net stars

Compare growth

69 repositories with this Tag. Select a column name to change the order.

#RepositoryStarsGained, 90 daysPace
21kevin1024/vcrpy

Automatically mock your HTTP interactions to simplify and speed up testing

3K+44–
22mockito/mockito

Most popular Mocking framework for unit tests written in Java

15K+43–
23nock/nock

HTTP server mocking and expectations library for Node.js

13K+32–
24SpectoLabs/hoverfly

Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

2.5K+32–
25devlooped/moq

The most popular and friendly mocking framework for .NET

6.4K+27–
26DATA-DOG/go-sqlmock

Sql mock driver for golang to test database interactions

6.6K+25–
27ChangemakerStudios/Papercut-SMTP

Papercut SMTP -- The Simple Desktop Email Server

3.3K+25–
28spulec/freezegun

Let your Python tests travel through time

4.5K+24–
29oguimbal/pg-mem

An in memory postgres DB instance for your unit tests

2.4K+24–
30nsubstitute/NSubstitute

A friendly substitute for .NET mocking libraries.

3K+21–
31sj26/mailcatcher

Catches mail and serves it through a dream.

6.8K+20–
32Netflix/pollyjs

Record, Replay, and Stub HTTP Interactions.

10K+19–
33vcr/vcr

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

6.1K+18–
34FakeItEasy/FakeItEasy

The easy mocking library for .NET

1.9K+18–
35matryer/moq

Interface mocking tool for go generate

2.2K+14–
36sinonjs/sinon

Test spies, stubs and mocks for JavaScript.

9.8K+13–
37maxbrunsfeld/counterfeiter

A tool for generating self-contained, type-safe test doubles in go

1.1K+12–
38mockery/mockery

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).

11K+10–
39pact-foundation/pact-jvm

JVM version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

1.1K+10–
40dnaeon/go-vcr

Record and replay your HTTP interactions for fast, deterministic and accurate tests

1.4K+8–

Faster than the 30 days before

Net stars of the last 30 days are 2 or more times those of the 30 days before.

  1. keploy/keploy4.2× · +806

Slower than the 30 days before

Net stars of the last 30 days are 50% or less of those of the 30 days before.

No repository with this Tag meets this rule now.

New in the last 90 days

Created on GitHub in the last 90 days.

No repository with this Tag meets this rule now.

Older than 2 years, still releasing

Created more than 2 years ago, with a push in the last 7 days and a GitHub release in the last 30 days.

  1. keploy/keploy19K · release today
  2. nock/nock13K · release 14 days ago
  3. axllent/mailpit11K · release 4 days ago
  4. karatelabs/karate9K · release 13 days ago
  5. getmoto/moto8.7K · release 7 days ago
All 16 in the table

Last release more than 180 days ago

The newest GitHub release is more than 180 days old. A repository that never published a release is not in this list.

  1. typicode/json-server76K · release 7 months ago
  2. YMFE/yapi28K · release 5 years ago
  3. nuysoft/Mock20K · release 10 years ago
  4. mailhog/MailHog16K · release 6 years ago
  5. sinonjs/sinon9.8K · release 8 years ago
All 24 in the table

Top GitHub topics with this Tag

Primary languages

How a repository gets this Tag

An agent reads the description, the GitHub topics, and the start of the README of each repository. It chooses Tags only from the Tag list in the AwesomeRepos source code. For each Tag, it quotes the text. A code check keeps the Tag only when the quote is in that text. The page of each repository shows the quote of each of its Tags. A Tag does not rank repositories. It does not say that one repository can replace another. To report a wrong Tag, use "Report a problem with this page" on the page of the repository.

How the numbers are counted

All numbers come from the Star History of the repositories that have the Tag now. A period is a run of complete UTC days. All numbers on this page count only the repositories that AwesomeRepos shows in lists. A machine computes them each hour.

For each repository, a period counts only when Star History has each of its days, or when the repository was created in the period. Otherwise the table shows "–". The bars of a week with no complete data are grey.

The Pace is the net stars of a period divided by the net stars of the period before. It shows only when Star History covers each day of the period before, with at least 3 net stars a day on average.

The chart at the top adds up the net stars of all the repositories with the Tag. The darker area is the part from the Seed Dataset; the rest is from rising Admissions. A rising Admission comes into the Repository Index because it gained stars quickly. Its Star History before its Admission comes from the Repository Host. Thus the days before many rising Admissions are higher than they were for the repositories in the index at that time. The repositories of the Seed Dataset are a set that does not change.

The releases are the GitHub releases of each repository. The lists and the table do not rank repositories, and they do not say that one repository can replace another.