Mock API Builder solves a common bottleneck: you need a realistic API while the real backend is still in progress.
Frontend developers shouldn't have to wait for backends. QA teams shouldn't have to build custom mock servers for every project. Teams shouldn't lose days wiring throwaway stubs.
Create a mock, get a shareable URL, and keep working, independently of backend timelines.
Typical API setup
Protocols supported
Guest project lifetime
Enterprise SAML / OIDC
No credit card to start. Fair-use rate limits keep the service reliable for everyone.
These principles shape product decisions and how we talk about limits.
Every decision starts with: does this make a developer's day easier? We build tools we want to use ourselves.
Complex problems deserve clear tools. Prefer fast setup and plain defaults over ceremony.
Straightforward roadmap communication. Fair-use limits are documented; no surprise billing for core features.
A solo project: built and maintained by one developer who needed the tool first.
I’m a full-stack developer who loves building tools that make our lives a little easier. I built Mock API Builder because I wanted a simpler, faster way to spin up endpoints and test workflows without the usual friction, whether you're flying solo or shipping in a team.
Three reasons this tool exists. For the full product surface, see Features.
A live mock URL lets UI work move while the real backend is still unfinished.
Import OpenAPI, GraphQL, .proto, or WSDL once. Stop rebuilding mock servers per project.
Teammates hit the same endpoints. Guest tries last 7 days; accounts keep longer-lived projects.
Key moments in Mock API Builder's development
First public release of Mock API Builder.
Export your mock APIs as Postman collections and review change history from Project Settings.
This release adds GraphQL, gRPC, and SOAP mocking, shared workspaces, a developer API for CI, and AI-powered mock data generation.
Mock API Builder started from a practical frustration: waiting on backend APIs before frontend work could move, and recreating throwaway mock servers for every project.
In 2024 I built the tool I wanted: import a contract (or define endpoints by hand), generate realistic data, and get a shareable URL with the basics teams expect: CORS, auth options, custom headers, and request logs.
What began as a personal fix grew into a free product for other developers facing the same bottleneck. Today it covers REST, GraphQL, gRPC, and SOAP, with guest access for quick tries and accounts for longer-lived projects. It remains a solo project focused on staying useful and honest about limits.
Mock API Builder solves a common bottleneck: you need a realistic API while the real backend is still in progress.
Frontend developers shouldn't have to wait for backends. QA teams shouldn't have to build custom mock servers for every project. Teams shouldn't lose days wiring throwaway stubs.
Create a mock, get a shareable URL, and keep working, independently of backend timelines.
Typical API setup
Protocols supported
Guest project lifetime
Enterprise SAML / OIDC
No credit card to start. Fair-use rate limits keep the service reliable for everyone.
These principles shape product decisions and how we talk about limits.
Every decision starts with: does this make a developer's day easier? We build tools we want to use ourselves.
Complex problems deserve clear tools. Prefer fast setup and plain defaults over ceremony.
Straightforward roadmap communication. Fair-use limits are documented; no surprise billing for core features.
A solo project: built and maintained by one developer who needed the tool first.
I’m a full-stack developer who loves building tools that make our lives a little easier. I built Mock API Builder because I wanted a simpler, faster way to spin up endpoints and test workflows without the usual friction, whether you're flying solo or shipping in a team.
Three reasons this tool exists. For the full product surface, see Features.
A live mock URL lets UI work move while the real backend is still unfinished.
Import OpenAPI, GraphQL, .proto, or WSDL once. Stop rebuilding mock servers per project.
Teammates hit the same endpoints. Guest tries last 7 days; accounts keep longer-lived projects.
Key moments in Mock API Builder's development
First public release of Mock API Builder.
Export your mock APIs as Postman collections and review change history from Project Settings.
This release adds GraphQL, gRPC, and SOAP mocking, shared workspaces, a developer API for CI, and AI-powered mock data generation.
Mock API Builder started from a practical frustration: waiting on backend APIs before frontend work could move, and recreating throwaway mock servers for every project.
In 2024 I built the tool I wanted: import a contract (or define endpoints by hand), generate realistic data, and get a shareable URL with the basics teams expect: CORS, auth options, custom headers, and request logs.
What began as a personal fix grew into a free product for other developers facing the same bottleneck. Today it covers REST, GraphQL, gRPC, and SOAP, with guest access for quick tries and accounts for longer-lived projects. It remains a solo project focused on staying useful and honest about limits.
