Mockbin
UnclaimedQuickly mock API endpoints, configure responses, and track requests without signup.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Completely free and open-source
Biggest con
Bin IDs are stored locally, meaning they are not accessible across devices or browsers
TL;DR - Mockbin
- Create mock API endpoints with custom responses instantly.
- Track all requests made to your mock endpoints.
- Generate mock APIs directly from OpenAPI v3.1 documents.
Pricing: Free forever
Best for: Individuals & startups
What is Mockbin?
Mockbin.io is an open-source and completely free tool designed for developers and testers who need to quickly create mock API endpoints. It allows users to define a fixed response for a given endpoint and then track all incoming requests to that endpoint. This is particularly useful for front-end development, testing, and prototyping when a back-end API is not yet available or needs to be simulated.
The platform also supports creating mock APIs from OpenAPI v3.1 documents. Users can upload their OpenAPI specifications (JSON or YAML), and Mockbin.io will automatically generate mock endpoints based on the schemas and examples provided in the document. This significantly speeds up the process of setting up complex mock APIs, ensuring consistency with API documentation.
A key benefit of Mockbin.io is its simplicity and privacy-focused approach. There is no sign-up required, and all bin IDs are stored locally in the user's browser storage, making it a quick and hassle-free solution for temporary or private mocking needs.
Available on: Web
Pros & Cons
Pros
- Completely free and open-source
- Extremely fast setup for mock APIs
- Supports OpenAPI specification for complex mocks
- Privacy-focused with no user accounts or data collection
- Easy to use for both simple and advanced mocking scenarios
Cons
- Bin IDs are stored locally, meaning they are not accessible across devices or browsers
- Lacks advanced features like dynamic responses or conditional logic
Preview
Key Features
Create custom mock API endpointsConfigure fixed response status codesDefine custom response headersSpecify custom response bodies (e.g., JSON)Track incoming requests to mock endpointsUpload OpenAPI v3.1 documents (JSON/YAML) to generate mocksNo sign-up requiredBin IDs stored locally in browser storage
Pricing Plans
Free
Free
- Quickly mock an API endpoint
- Configure a fixed response
- Track requests to your endpoint
- Upload OpenAPI document and mock it using schemas and examples
- No sign-ups required
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Mockbin FAQ
How does Mockbin.io handle the persistence of created bins if there's no user account system?
Mockbin.io stores the IDs of your recently created bins directly in your browser's local storage. This means your bins are accessible only from the specific browser and device you used to create them. If you clear your browser data or switch devices, your list of recent bins will be empty, though the bins themselves remain active until they expire.
Can I use Mockbin.io to mock an API that requires specific authentication headers or complex request bodies?
While Mockbin.io allows you to define a fixed response, including headers and body, it does not currently support dynamic responses based on incoming request headers, body content, or authentication schemes. It provides a static mock for a given endpoint, and you can track the details of any request that hits it.
What happens if my OpenAPI document contains multiple paths or complex schemas with examples? How does Mockbin.io generate the mock endpoints?
When you upload an OpenAPI v3.1 document, Mockbin.io processes the defined paths, schemas, and examples within that document. It attempts to generate mock endpoints for each path, using the provided examples in your schemas to construct the mock responses, ensuring the generated mocks align with your API specification.
Is there a limit to how many mock bins I can create or how long they remain active?
There is no explicit limit mentioned for the number of bins you can create. However, the service is designed for quick, temporary mocking. While bins remain active for a period, they are not intended for long-term, permanent API hosting. Specific expiration policies are not detailed, but they are generally short-lived.
If I create a mock bin, can other team members access it, or is it private to my browser?
Once you create a mock bin, anyone with the generated URL can access it. However, the management and tracking interface for that specific bin (e.g., viewing recent requests) is tied to your browser's local storage. To share access to the tracking interface, you would need to share your browser's local storage data, which is not practical or recommended. The primary use case is for individual development and testing, or sharing the mock endpoint URL for others to consume.
Source: mockbin.io