01
DEFINE
Add or import TypeScript interfaces and enums in the cloud dashboard.
Learn about define →1
2
3
4
5
interface User {
id: number;
name: string;
email: string;
}
Mock API StudioToggle navigation
LOCAL-FIRST MOCK API WORKFLOW
Build Mock APIs from TypeScript — Run Them Locally
Build the API your frontend is waiting for. Turn TypeScript interfaces into realistic mock REST APIs, configure production-like behavior, and run the complete mock backend locally before the real backend is ready.
Cloud-managed configuration · Locally generated responses and records
customer-portal● SYNCED
01 · SCHEMA — customer.ts✓ INTERFACE DETECTED
interface Customer {
id: number;
name: string;
email: string;
status: "active" | "inactive";
}
type MockApiStudioResponse = Customer[];02 · LOCAL RUNTIME
$ npx mock-api-studio-cli customer-portal
✓ Project synced
✓ 60 records generated
✓ API running at localhost:4000
GET /customers
POST /customers
GET /customers/:id▌TYPESCRIPT TO REST
Turn a typed contract into a working endpoint
Define the response shape once, bind it to a resource, and let the local runtime generate realistic records that your frontend can read and change.
interface Product {
id: string;
name: string;
price: number;
inStock: boolean;
}
type MockApiStudioResponse = Product[];GET http://localhost:4000/products
{
"data": [{
"id": "product-1",
"name": "Mechanical Keyboard",
"price": 89.99,
"inStock": true
}]
}HOW IT WORKS
From TypeScript to a running API
Define your data, configure real-world behavior, and start a local API in seconds.
02
CONFIGURE
Map types to resources and configure auth, latency, errors, queries, and relationships.
Learn about configure →Auth
Latency
Failures
Pagination
Relationships
03
RUN LOCALLY
Sync the project and start a persistent local Express and SQLite backend.
Learn about run locally →$ npx mock-api-studio-cli
API running at localhost:4000
Local records
Your generated data stays on your machine.
TypeScript-first
Use your TypeScript models end to end.
Developer first
Built for fast, realistic frontend work.
Real backend behavior. Without the backend bottleneck.
Keep your API configuration in the cloud while the mock server and generated data stay on your machine.
http://localhost:3001/customer-portalv3
RESOURCES
customers60
orders240
invoices92
webhooks12
ENDPOINTS● RUNNING · localhost:4000
GET/customers200 · 240ms
POST/customers201 · auth
DELETE/customers/:id5% fail
auth: bearerlatency: 240mspage: 25
TYPESCRIPT MODELS
Reuse serializable interfaces, aliases, and string enums to define endpoint responses.
Learn more →LOCAL RUNTIME
Serve stateful CRUD endpoints through Express and keep generated records in local SQLite.
Learn more →RELATIONSHIPS
Generate valid foreign keys and exercise parent-child routes without orphaned records.
Learn more →REAL API BEHAVIOR
Control authentication, latency, failures, pagination, search, and sorting.
Learn more →Keep building while the real backend catches up
Frontend and mobile developers
Build complete screens against a stable HTTP contract before production endpoints exist.
Explore this workflow →QA and integration testing
Reproduce latency, failures, authorization, pagination boundaries, and relational data.
Explore this workflow →Freelancers and agencies
Demo stateful features with repeatable local data while client services are evolving.
Explore this workflow →Product teams
Let frontend and backend work in parallel from shared TypeScript-shaped contracts.
Explore this workflow →Explore the TypeScript mock API workflow
Move from the product overview to the exact solution, documentation, or tutorial you need.
Create a mock API from TypeScript
Turn typed interfaces into generated REST response data.
Run a local mock API server
Understand cloud configuration and local execution.
API mocking for frontend development
Build complete UI states before the real backend is ready.
Mock APIs for QA testing
Reproduce auth, failure, latency, and boundary cases.
Get started with Mock API Studio
Create, synchronize, and call your first local endpoint.
Define a TypeScript schema
Learn supported types, validation, and response bindings.
Simulate authentication
Exercise bearer, API-key, and Basic authentication flows locally.
Configure pagination and sorting
Match collection queries and test boundary states.
Connect related resources
Generate valid foreign keys and use nested mock API routes.
Use the Mock API Studio CLI
Synchronize a project and start its local mock server.
Inspect generated OpenAPI
Use the local OpenAPI document and Swagger UI.
Use the local runtime
Run Express, SQLite, and generated data on your machine.
Read practical mock API guides
Follow task-based tutorials for TypeScript and frontend teams.
Compare pricing plans
Choose the plan that fits your projects and team.
Choose the mock API workflow that fits your team
Compare a desktop mock server, a hosted endpoint, and a TypeScript-first local runtime using sourced, regularly reviewed product facts.
FAQ
Questions developers ask before trusting a mock backend.
What is Mock API Studio?+
Mock API Studio is a developer tool for defining API resources with TypeScript, configuring realistic backend behavior in a cloud dashboard, and running the generated mock API locally.
Does the mock backend run locally?+
Yes. The CLI synchronizes your project configuration, then the mock server and generated records run on your machine.
How do I create a mock API from TypeScript?+
Create a project, add a resource, define its response with a TypeScript interface or type alias, generate an API token, and start the local runtime with the Mock API Studio CLI.
Which API behaviors can I simulate?+
You can configure CRUD operations, generated data, relationships, latency, injected errors, authentication, pagination, search, sorting, and deterministic seeds.
Does Mock API Studio upload my generated mock records?+
No. The cloud dashboard stores project configuration, while the local runtime generates and serves mock records on your machine.
Can the local mock API simulate authentication?+
Yes. The runtime supports API key, bearer token, and basic authentication modes, along with configurable login and registration behavior.
Who is Mock API Studio for?+
It is built for frontend developers, backend developers, QA engineers, freelancers, agencies, and product teams that need a controllable API before production endpoints are ready.
Can I start for free?+
Yes. The Free plan lets you create a personal mock API project and try the core cloud-to-local workflow without a credit card.