openapi-mock
OpenAPI mock server with random data generation (by muonsoft)
mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source. (by mockoon)
| openapi-mock | mockoon | |
|---|---|---|
| 2 | 56 | |
| 505 | 7,505 | |
| 0.2% | 4.7% | |
| 0.0 | 9.3 | |
| about 1 year ago | 13 days ago | |
| Go | TypeScript | |
| MIT License | GNU General Public License v3.0 or later |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
openapi-mock
Posts with mentions or reviews of openapi-mock.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-01-25.
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How to Automatically Consume RESTful APIs in Your Frontend
Since the OpenAPI can effectively describe our resources, we can reuse it to generate a dummy server that can be later used for development and testing purposes without bootstrapping any actual services. There some tools available that can help us with this task, such as Prism, OpenAPI Mock, OpenAPI Backend and the MSW library we have already seen.
- Eskimo is a supercharged mocking server for developers and testers, that aims to abstract the complexities of coding a mock server into simple JSON configurations.
mockoon
Posts with mentions or reviews of mockoon.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-07-01.
- Ask HN: Who wants to be hired? (July 2025)
- Mockoon is the easiest and quickest way to run mock APIs locally
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How to Implement Mock APIs for API Testing
Mockoon: This open-source desktop application offers a fast setup with a user-friendly interface. It excels at creating customizable responses and supports multiple environments without requiring complex configuration. Mockoon is particularly useful for local development.
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Why Feedback Loops Matter in API Development
Mocking: Help your front-end team discover integration or design issues early in the API development process by mocking your API endpoints. You can either due this directly from your gateway, or use a service like Mockoon
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Thoughts on ThoughtWorks Radar 2024
I hate mocks. I tend to work in languages which allow side-effects, and with developers who do not follow Pure Core, Imperative Shell. So anything I can do to learn more about my enemy, and how to manage it, is a good use of time, and Mockoon is another one of those mock creators.
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Ask HN: What Are You Working On? (October 2024)
I'm currently working on Mockoon, an API mocking tool. It's an open-source project that I've been relentlessly improving over the past 7 years. I decided to build a SaaS/cloud offering to help finance my work on the project. I'm solo bootstrapping, and revenues are slowly growing. It's not the easiest path, but definitely worth it!
https://mockoon.com
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Tools found from TechRadar
Mockoon is an open-source API mocking tool. It has an intuitive interface, customizable routes and dynamic responses as well as the ability to automate the creation of mock data sets. Mockoon is compatible with OpenAPI and lets you generate different scenarios that can be tested locally and integrated with a development pipeline. You can also create "partial mocks" by intercepting the requests and only faking the calls that are defined in Mockoon. The partial mocks help simulate specific API routes or endpoints and forward other requests to actual servers. While partial mocks can be useful in certain scenarios, there is a risk of overuse, which may lead to unnecessary complexity. Besides that, Mockoon remains a valuable tool for quickly setting up mock APIs as well as improving and automating development workflows.
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Ask HN: What are you working on (August 2024)?
I'm working on https://mockoon.com an API mocking tool. I launched it here as a side-project 7 years ago, and I'm now full-time, trying to bootstrap a Saas platform.
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Handling Firebase Notifications in Flutter: Practical Tips
Mockoon - Used as a logging server instead of using print in the console.
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Ask HN: Those making $500+/month on side projects in 2024 – Show and tell
Hopefully, 2024 is the year I can stop freelancing and live the dream! Work on an open-source project I love while not feeling guilty about not bringing enough money home :D
--> https://mockoon.com
What are some alternatives?
When comparing openapi-mock and mockoon you can also consider the following projects:
typed-openapi - Generate a headless Typescript API client from an OpenAPI spec - optionally with a @tanstack/react-query client using queryOptions
msw - Industry standard API mocking for JavaScript.
swagmock - Mock data generator for swagger api
mountebank - Over the wire test doubles
gnostic - A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.
miragejs - A client-side server to build, test and share your JavaScript app