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Mockbin

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Quickly mock API endpoints, configure responses, and track requests without signup.

API ToolsTesting & QADeveloper ToolsPrototyping
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Tracked since2026
0 reviews tracked

The 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?

Editorial review
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

how we evaluateSourcemockbin.io ↗

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

Pricing checked Aug 21, 2026

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
Calculate your costView full pricing

Is Mockbin worth the price?

95/100

Mockbin's pricing is exceptionally generous as it offers a fully functional API mocking service completely free of charge.

There are no paid tiers, making it an outstanding value for anyone needing to quickly mock API endpoints without any financial commitment. It's best for individual developers, small teams, or anyone needing a temporary or ad-hoc mocking solution.

Hidden Costs & Gotchas

No enterprise-grade features

No dedicated support channels

Potential rate limits (undocumented)

How Mockbin Compares to Competitors

Compared to services like Postman, which offers free tiers but often pushes users towards paid plans for advanced collaboration or higher usage, Mockbin stands out by being entirely free. Similarly, tools like Stoplight Studio offer more comprehensive API design and mocking but come with significant costs for team features, whereas Mockbin remains a zero-cost solution for basic mocking needs.

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Best Mockbin Alternatives

Top alternatives based on features, pricing, and user needs.

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Visually design, manage, and publish OpenAPI specs

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SwaggerHub logo
SwaggerHubPaid

Design, test, and govern AI-ready APIs with enhanced collaboration and automation.

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MockoonFreemium

Create local mock APIs instantly, no internet needed

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

Mockbin vs PostmanHead-to-head: features, pricing, who winsMockbin vs StoplightHead-to-head: features, pricing, who winsMockbin vs SwaggerHubHead-to-head: features, pricing, who wins

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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

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