Q: Is Mockd free?

Yes! The open source CLI is completely free and unlimited — no endpoint caps, no request limits, all 7 protocols, Prometheus metrics, mTLS, chaos engineering, and 18 MCP tools. Mockd Cloud adds team collaboration, cloud tunnels, and shared workspaces with a generous free tier and paid plans for larger teams.

Q: What are the system requirements?

Mockd is a single Go binary with zero runtime dependencies — no Node.js, no Java, no Docker required. It runs on macOS, Windows, and Linux (amd64 and arm64). Memory usage is typically under 30MB and startup takes less than 10ms.

Question 1

What is Mockd?

Accepted Answer

Mockd is a powerful, multi-protocol API mocking tool that lets you create, record, and manage mock APIs for development and testing. It supports HTTP/REST, GraphQL, WebSocket, gRPC, SOAP, Server-Sent Events (SSE), and MQTT protocols all in one unified platform.

Question 2

Is Mockd free?

Accepted Answer

Yes! The open source CLI is completely free and unlimited &mdash; no endpoint caps, no request limits, all 7 protocols, Prometheus metrics, mTLS, chaos engineering, and 18 MCP tools. Mockd Cloud adds team collaboration, cloud tunnels, and shared workspaces with a generous free tier and paid plans for larger teams.

Question 3

What protocols does Mockd support?

Accepted Answer

Mockd supports 7 protocols: HTTP/REST, GraphQL, WebSocket, gRPC, SOAP/XML, Server-Sent Events (SSE), and MQTT. All protocols are available on every tier, including the free plan.

Question 4

How is Mockd different from Postman/WireMock/MSW?

Accepted Answer

Unlike Postman (limited to 1,000 calls/month on free tier) or WireMock Cloud (10 req/s limit), Mockd has no call limits or endpoint caps. Mockd also supports 7 protocols out of the box, works completely offline, and provides built-in traffic recording and replay capabilities.

Question 5

How do I install Mockd?

Accepted Answer

The fastest way is our install script: curl -sSL https://get.mockd.io | sh. You can also use Homebrew (brew tap getmockd/mockd && brew install mockd), Go (go install github.com/getmockd/mockd/cmd/mockd@latest), or Docker (docker run ghcr.io/getmockd/mockd). See the quickstart page for full details.

Question 6

Does Mockd require Docker?

Accepted Answer

No, Docker is optional. Mockd runs natively on macOS, Windows, and Linux. Docker is available for those who prefer containerized deployments or need to run Mockd in CI/CD pipelines.

Question 7

What are the system requirements?

Accepted Answer

Mockd is a single Go binary with zero runtime dependencies &mdash; no Node.js, no Java, no Docker required. It runs on macOS, Windows, and Linux (amd64 and arm64). Memory usage is typically under 30MB and startup takes less than 10ms.

Question 8

Can I run Mockd in CI/CD?

Accepted Answer

Absolutely! Mockd works with any CI/CD system — just add the binary. Use our Docker image or download the CLI directly in your pipeline. It runs in GitHub Actions, GitLab CI, Jenkins, CircleCI, or any system that can execute a binary.

Question 9

Can Mockd record real API traffic?

Accepted Answer

Yes! Mockd can act as a proxy to record real API traffic and automatically generate mocks from the recorded requests and responses. This is perfect for creating realistic test fixtures from production APIs.

Question 10

Does Mockd support HTTPS/TLS?

Accepted Answer

Yes, Mockd fully supports HTTPS with automatic certificate generation for local development. You can also provide your own certificates for production-like environments or when testing with specific TLS configurations.

Question 11

Can I simulate latency and errors?

Accepted Answer

Yes! Mockd allows you to add artificial latency, simulate network errors, return specific HTTP status codes, and create conditional responses based on request parameters. This is invaluable for testing edge cases and error handling.

Question 12

Does Mockd support authentication?

Accepted Answer

Mockd supports mocking authenticated endpoints with API keys, Bearer tokens, Basic auth, and OAuth flows. You can configure your mocks to validate authentication headers and return appropriate responses based on credentials.

Question 13

Can I run multiple isolated API environments in a single mockd instance?

Accepted Answer

Yes! Workspaces provide full isolation for mocks, stateful resources, and request logs. Create workspaces with mockd workspace create, then scope commands with --workspace. Each workspace operates independently &mdash; changes in one workspace don't affect others.

Question 14

Is Mockd secure for enterprise use?

Accepted Answer

Yes. Mockd is designed with security in mind. It runs locally by default (no data leaves your machine), supports air-gapped environments, and the Enterprise tier includes SSO/SAML, audit logging, and dedicated support with SLAs.

Question 15

Does Mockd support mTLS?

Accepted Answer

Yes, Mockd supports mutual TLS (mTLS) in the free open-source CLI. You can configure client certificate validation, match requests by certificate fields (CN, OU, SAN), and use mTLS identity in response templates. No enterprise license required.

Question 16

What compliance certifications exist?

Accepted Answer

Mockd runs locally by default and does not store or transmit your data to external servers. For Mockd Cloud (coming soon), we are pursuing SOC 2 Type II certification. Enterprise customers will be able to request our security documentation and complete security questionnaires.

Question 17

Is there enterprise support available?

Accepted Answer

Yes! Enterprise tier includes dedicated support with guaranteed SLAs, a dedicated account manager, custom onboarding, and priority access to the engineering team for feature requests and bug fixes.

Question 18

How does mockd work with AI agents?

Accepted Answer

mockd has a built-in MCP (Model Context Protocol) server with 18 tools. AI agents in Claude Desktop, Cursor, Windsurf, or any MCP-compatible client can create mocks, manage state, and verify API contracts through natural conversation. Run mockd mcp to start the MCP server.

Question 19

What can AI agents do with mockd?

Accepted Answer

Agents can create and manage mocks (manage_mock), build stateful CRUD APIs (manage_state), import OpenAPI specs (import_mocks), inject chaos faults (set_chaos_config), check request logs (get_request_logs), verify mock invocations (verify_mock), and manage workspaces (manage_workspace) — all through MCP tool calls, no CLI needed.

Question 20

What is a digital twin?

Accepted Answer

A digital twin is a stateful mock that behaves like a real API. For example, our Stripe digital twin has 9 data tables, 46 CRUD bindings, and 8 custom operations — POST /v1/customers actually creates a customer that GET /v1/customers/:id can retrieve, with prefix IDs (cus_), Stripe list envelopes, and response transforms. The stripe-go SDK passes 49/49 tests against it.

Question 21

How do I create a digital twin?

Accepted Answer

Use the tables + extend pattern in a YAML config. Define tables with seed data, then use extend bindings to wire imported API spec endpoints to CRUD operations. See the Stripe, Twilio, and OpenAI samples at github.com/getmockd/mockd-samples for complete examples.

Question 22

Can I share my mocks with teammates?

Accepted Answer

Yes! Use mockd tunnel --port 4280 to get a public URL that routes traffic to your local mock server. No signup required for anonymous tunnels (2-hour session, 100MB bandwidth). Paid tiers get longer sessions, more bandwidth, and authentication options.

Question 23

Does mockd work behind a firewall?

Accepted Answer

Yes. The tunnel connects outbound to relay.mockd.io on port 443, so it works behind NAT and most firewalls. No port forwarding or firewall rule changes needed.

Question 24

Which protocols work through the tunnel?

Accepted Answer

All 7: HTTP, gRPC, WebSocket, MQTT, SSE, GraphQL, and SOAP. Everything is multiplexed through a single secure connection on port 443.

Question 25

How do I test webhooks locally?

Accepted Answer

Start your mock server, then run mockd tunnel --port 4280. Point the webhook provider (Stripe, GitHub, Twilio, etc.) at your tunnel URL. Incoming webhooks are routed to your local mock server in real time.

Question 26

Is the open source version fully featured?

Accepted Answer

Yes. The open source CLI includes all 7 protocols, unlimited endpoints, unlimited requests, record & replay, smart matching, dynamic responses, and stateful mocks. Mockd Cloud adds team collaboration, cloud tunnels, and hosted mock environments.

Question 27

What's included in the Pro tier?

Accepted Answer

Pro tier includes team collaboration features, additional cloud-hosted mock environments, email support, and priority bug fixes. See the pricing page for current details.

Question 28

Do you offer enterprise pricing?

Accepted Answer

Yes, we offer custom enterprise pricing based on your organization's needs. Enterprise includes SSO/SAML, audit logs, SLA guarantees, dedicated support, and on-premise deployment options. Contact sales@mockd.io for a quote.

Question 29

Is there a free trial?

Accepted Answer

The Hobby tier is completely free with no time limit and no restrictions. When paid plans launch, we plan to offer free trials so you can evaluate before committing. Join the waitlist on the pricing page to be notified.

Frequently Asked Questions

General Questions

Installation & Setup

Features & Capabilities

Enterprise & Security

AI & MCP Integration

Cloud Tunnel

Pricing & Licensing

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