How to Mock API Calls

This article will delve into why using API mocking is crucial and provide a detailed guide on how to simulate API calls.

David Demir

David Demir

30 July 2025

How to Mock API Calls

In the development process, the simulation of API calls has gained significant importance due to the practical benefits it brings. This article will delve into why using API mocking is crucial and provide a detailed guide on how to simulate API calls.

💡
Apidog is a powerful API mocking tool, that excels in efficiently handling the process of creating mock data for APIs that are designed but not yet implemented. Apidog stands out by automating the generation of data, eliminating the need for manual input when setting up a mock server, and providing response examples.
button

Why Use API Mocking?

In web development, external API dependencies can be unavailable during maintenance or ongoing development. Mock APIs enable seamless progress, allowing developers to move forward without being blocked by external API unavailability.

API mocking facilitates independent development and testing, allowing different teams to work in parallel without waiting for each other. This accelerates the development cycle, promotes continuous improvement, and reduces dependencies on actual external services, resulting in faster iterations.

Mock APIs are essential for swift feedback, aiding unit testing, and helping developers and testers plan and validate test executions. They also decouple frontend development, allowing frontend developers to build against a well-defined specification, particularly useful for consumer testing or demos before committing to full development.

Why Mock API Call?

Mocking API calls plays a pivotal role in the software development lifecycle, offering several compelling reasons to adopt this practice:

API Mock Tool

Front-end developers often encounter the challenge of dealing with APIs that have been designed but not yet implemented. Creating mock data for interfaces involves setting up a mock server and providing response examples, which can be a tedious task, especially when no response examples are available in the API documentation.

The process of manually adding response data or writing mocking code for each field, as required by tools like Postman or faker.js, may not align with the ideal responsibilities of a front-end developer. A more efficient solution would be an exceptional API mocking tool that can autonomously generate data, allowing developers to focus on essential tasks without the need for extensive manual intervention.

Apidog comes highly recommended as a solution to address the challenges mentioned earlier. This tool excels in efficiently handling the process of creating mock data for APIs that are designed but not yet implemented. Apidog stands out by automating the generation of data, eliminating the need for manual input when setting up a mock server, and providing response examples.

button

The Detailed Guide: How to Mock API Calls?

Now, let's explore a step-by-step guide on how to effectively mock API calls in Apidog.

Prequisitist:

Ensure you possess API documentation, preferably in YAML or JSON format like OpenAPI (Swagger). If an API isn't available, seamlessly generate Swagger documentation within Apidog.

Step 1.  Import API definitions

Initiate a new project in Apidog, then navigate to "Settings" -> "Import" and smoothly drag your API file into Apidog. It supports Postman, OpenAPI, and other API documentation formats, proceed by clicking "Next" for completion.

 Import API definitions
Import success

Step 2. Retrieve the Mock URL

Select an API in Apidog, directing you to the API definition page featuring a dedicated "Mock" section. Click the URL beneath "Local Mock" (commencing with "127.0.0.1") for copying, and paste this URL into your browser.

Retrieve the Mock URL

Step 3. Paste this URL into your browser.

URL in browser

By following this comprehensive guide, you can leverage API mocking to streamline development, enhance testing efficiency, and foster a more agile and iterative development process.

Explore more

How to Use Veo 3.1 API

How to Use Veo 3.1 API

Discover how to use the Veo 3.1 API for generating high-quality videos with audio and advanced controls.

16 October 2025

How to Use Claude Haiku 4.5 API

How to Use Claude Haiku 4.5 API

Discover how to integrate and utilize the Claude Haiku 4.5 API for efficient AI-driven applications. This guide covers setup, features, pricing, and advanced usage, including testing with Apidog.

16 October 2025

How Can You Master the GPT-5 Search API in 2025?

How Can You Master the GPT-5 Search API in 2025?

Unlock the potential of OpenAI's gpt-5-search-api-2025-10-14 and gpt-5-search-api with this step-by-step technical guide. Developers learn setup, implementation, parameters, and integration strategies for real-time web searches. Leverage Apidog for seamless API testing and optimization

15 October 2025

Practice API Design-first in Apidog

Discover an easier way to build and use APIs