About MockServer
MockServer is a self-hosted tool that mocks, proxies and records HTTP traffic. It can stand in for dependencies in tests so that they run fast and do not rely on outside services.
What it does
You create expectations that match requests and return set responses, so your application can run against a fake service. It can also proxy and record real traffic for later replay, inject latency and errors for chaos tests, and generate mocks from OpenAPI or WSDL definitions. A built-in MCP server lets AI assistants drive it.
Key features
- Mock HTTP/1.1, HTTP/2, HTTP/3 and gRPC services
- Record and replay live traffic
- Inject latency, errors and dropped connections
- Built-in MCP server for AI assistants
Who it's for
- QA and test engineers
- Backend teams with fragile dependencies
- Teams building against APIs that are not ready yet
Pricing and good to know
MockServer is free and open source under the Apache-2.0 license. It runs anywhere and needs no SaaS account. The site's example starts it with a single Docker command. Because it is self-hosted, you run and secure the server yourself.
Highlights
- Mock HTTP/1.1, HTTP/2, HTTP/3 and gRPC services
- Record and replay live traffic
- Inject latency, errors and dropped connections
- Built-in MCP server for AI assistants
