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MockServer
What it is
MockServer is free, self-hosted software for simulating and proxying HTTP, HTTPS, and gRPC services in isolated, deterministic tests. It can serve as a mock, proxy, or request-verification tool. Mocks can be generated and traffic checked against OpenAPI or Swagger specifications, and recorded traffic can be imported from browser HAR files or Postman collections. It also supports mocking AsyncAPI brokers such as Kafka, MQTT, and AMQP, along with OAuth2/OIDC providers. For chaos testing, it can introduce latency, error responses, dropped connections, or malformed responses into mocked or proxied traffic. Supported protocols include HTTP/1.1, HTTP/2, HTTPS, SOCKS, and experimental HTTP/3; HTTP/3 uses a separate UDP port. Deployment options include Docker, an executable JAR, Helm/Kubernetes, Testcontainers, Homebrew, and a JVM-less binary bundle. Official clients are available for Java, JavaScript, Python, Ruby, Go, .NET, Rust, and PHP, alongside a CLI and REST API. A web dashboard displays live logs, expectations, and recorded traffic, with Prometheus metrics and OpenTelemetry tracing for shared environments. Control-plane requests can use mutual TLS, JWT, or both, but status and readiness probes remain unauthenticated and reachable.
For and against
For
- Supports OpenAPI and Swagger traffic validation.
- Recorded traffic imports from HAR and Postman.
- Chaos testing can simulate latency and dropped connections.
- Includes dashboard, Prometheus metrics, and OpenTelemetry tracing.
- Clients cover eight listed programming languages.
Against
- HTTP/3 support is experimental and uses a separate UDP port.
- Status and readiness probes bypass authentication and authorization.
- Self-hosted deployment requires running an instance.
The verdict
MockServer combines mock, proxy, verification, and chaos-testing roles with several deployment options. Teams should account for the unauthenticated health probes when configuring access.
Who it suits
MockServer suits developers and test teams that need self-hosted service virtualization, contract testing, or controlled fault injection. Its multiple deployment paths and language clients may help teams working across different environments.
Plans and prices
Free and open-source
self-hosted · no SaaS account
Read 1 Oct 2026 · mock-server.com
On the record
- AI integration
- Every instance includes an MCP server at /mockserver/mcp for assistants such as Claude Code, Cursor, Windsurf, Cline and OpenCode.mock-server.com · read 1 Oct 2026
- API contracts
- Mocks can be generated and traffic validated from OpenAPI or Swagger specifications.mock-server.com · read 1 Oct 2026
- Chaos testing
- It injects latency, error responses, dropped connections and malformed responses into mocked or proxied HTTP, gRPC and TCP traffic.mock-server.com · read 1 Oct 2026
- Client integrations
- Official clients are available for Java, JavaScript, Python, Ruby, Go, .NET, Rust and PHP, alongside the CLI and REST API.mock-server.com · read 1 Oct 2026
- Control-plane security
- Control-plane requests can be authenticated with mutual TLS, JWT or both, and authorization can map OIDC scopes or groups to roles.mock-server.com · read 1 Oct 2026
- Core roles
- It can act as a mock, proxy and request-verification tool.mock-server.com · read 1 Oct 2026
- Deployment
- It can run through Docker, an executable JAR, Helm/Kubernetes, Testcontainers, Homebrew or a JVM-less binary bundle.mock-server.com · read 1 Oct 2026
- Imports
- Recorded traffic can be imported from browser HAR files and Postman collections.mock-server.com · read 1 Oct 2026
- Messaging and identity
- It can mock gRPC services, AsyncAPI brokers including Kafka, MQTT and AMQP, and OAuth2/OIDC providers.mock-server.com · read 1 Oct 2026
- Observability
- A built-in web dashboard shows live logs, expectations and recorded traffic, while Prometheus metrics and OpenTelemetry tracing support shared environments.mock-server.com · read 1 Oct 2026
- Protocol support
- It supports HTTP/1.1, HTTP/2, HTTPS, SOCKS and experimental HTTP/3, with HTTP/3 using a separate UDP port.mock-server.com · read 1 Oct 2026
- Purpose
- MockServer mocks and proxies HTTP, HTTPS and gRPC services for fast, isolated and deterministic testing.mock-server.com · read 1 Oct 2026
- Security limitation
- The /mockserver/status and /mockserver/ready health probes are always reachable without authentication or authorization.mock-server.com · read 1 Oct 2026
- Source and support
- GitHub hosts the source code, feature requests, issues, pull requests and releases.mock-server.com · read 1 Oct 2026
- Template safety
- Velocity class loading is disabled by default and JavaScript templates cannot resolve Java classes unless explicitly allowed.mock-server.com · read 1 Oct 2026
