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VidaiMock

Open Source LLM Native Mock API Test Engine

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  • Open source
  • Free forever

What is VidaiMock?

VidaiMock is an open source API testing engine built specifically for large language models. It allows developers to create mock APIs and test LLM integrations without hitting real endpoints, which saves costs and speeds up development cycles. The tool is designed for teams working with AI applications who need to validate API behaviour, test different response scenarios, and debug integration issues before going to production. Because it's open source, you can inspect the code, modify it to suit your needs, and host it yourself rather than relying on a third-party service.

Key features

Mock API generation

create fake API endpoints that respond like real ones

LLM-native testing

specifically designed to work with language model workflows and response patterns

Open source codebase

full access to source code for customisation and self-hosting

Response scenario testing

configure different responses to test how your application handles various outputs

Local deployment

run entirely on your own infrastructure for privacy and control

Pros & cons

Advantages

  • No cost; open source means no subscription fees or usage limits
  • Full transparency and control over how your mock APIs work
  • Designed specifically for LLM testing rather than generic API mocking
  • Can be self-hosted, keeping test data and workflows private

Limitations

  • Requires technical setup and maintenance since you host it yourself
  • Open source projects may have slower updates or less formal support compared to commercial tools
  • Community-driven documentation may be less detailed than enterprise alternatives

Use cases

Testing chatbot integrations before connecting to production LLM APIs

Simulating different API response types to validate error handling

Developing and debugging AI applications without incurring API costs

Creating reproducible test scenarios for CI/CD pipelines

Training and onboarding teams on how your LLM integration works

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Pricing

Open Source

Free

Full access to VidaiMock source code, self-hosted deployment, no usage restrictions

Get started with VidaiMock

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Get VidaiMock
  • Open source
  • Free forever