Quick Introduction to Postman and API Testing for Beginners from Udemy

You are not the first one. REST APIs are everywhere nowadays but you may not know where to begin. If you are a total beginner to APIs and are looking for a quick introduction to API by using Postman. This course is for you.

What are APIs all about?

Today, all IT systems are interconnected by using APIs, which are a way to exchange data, mostly by using a format call JSON.

However, learning about APIs can easily get confusing. You need to know: different HTTP methods, headers, cookies, dealing with file uploads or authentication with API keys, tokens, OAuth and so much more.

This is where Postman comes in. Postman allows you very quickly to create a request with the required HTTP method and parameters, submit the request and easily inspect the results.

Postman can help if you are developing APIs as well. I have created this course for testing engineers and well as for software developers.

Postman can help you during the development of your API as well as after the API is completed, by running tests that make sure your API is still working as intended.

In this Postman crash course for beginners, we will start exploring the features of Postman, creating requests, and building simple workflows. Then we will continue by writing API tests and automatically running a Postman collection by using the Postman Collection Runner and Newman.

Is this course for me?

If you need to get up to speed with Postman and start using APIs and don't have a lot of time, this course will probably take you very far in a very short time. You don't need much to get started, but you need to invest more than 3 hours. Just watching the content may not be enough to develop the skills needed. You need to do the work and the practice assignments.

So let’s look at what you are going to learn:

Start with simple requests
Use HTTP methods like
Work with query parameters and path variables
Understand HTTP headers
Learn to deal with authentication (for example using Bearer token)
Start writing API tests with JavaScript
Organize tests in collections and share them with your team
Run API tests using the collection runner or Newman

So after this course, you will have an overview of Postman and can later decide in which areas you want to learn more.

Excited to learn Postman? Join this course today.

What's inside

Learning objectives

Introduction to apis by using postman
Start using postman
Overview of the http messages
Use query parameters, path variables and headers
Read/write json

Write basic api tests
Work with postman variables
Create simple workflows
Learn http request methods: get, post, patch & delete

Introduction to apis by using postman
Start using postman
Overview of the http messages
Use query parameters, path variables and headers
Read/write json
Write basic api tests
Work with postman variables
Create simple workflows
Learn http request methods: get, post, patch & delete

Syllabus

Introduction

Course materials

In this lecture we are going to install the Postman app. Just in case you are using a Postman Google Chrome extension, please remove that and use the standalone app.

Keeping Postman up-to-date is very important. Make sure you always have the most recent version as it may include bug fixes, new features or important security updates.

This lecture provides a quick introduction to APIs, explaining their significance as application programming interfaces. The lecture emphasizes that APIs serve as interfaces to data on remote servers, enabling program communication and data exchange. It introduces Postman as a tool that simplifies API usage without requiring coding or complex commands. Through practical examples, attendees gain hands-on experience to demystify APIs.

This lecture jumps into create your first request with Postman.

This lecture provides an introduction to HTTP and API communication using Postman. We briefly discuss the need for the HTTP protocol, request methods, headers, and the structure of HTTP messages. You will understand the importance of using HTTPS for secure communication and the components of a request and response, including URLs, status codes, headers, and bodies. You will gain insights into reading API documentation, following conventions, and creating HTTP messages. This lecture sets the foundation for further exploration of HTTP requests and responses in API interactions.

This lecture provides an overview of working with requests and collections in Postman. You will learn how to save requests for later use by creating collections, which serve as folders to organize related requests. The concept of a base URL is also introduced, emphasizing its significance in the API documentation. The lecture highlights the importance of efficient request configuration and demonstrates how to run saved requests from the workspace. One other importance concept is understanding how to use Postman variables to store configuration, such as the base URL. The difference between the "Initial value" and the "Current value" is being discussed.

This short quiz tests your knowledge of using collections and variables in Postman. You will be presented with multiple-choice questions. Choose the correct option to showcase your understanding of these vital concepts.

Good luck, and let’s dive in!

Before watching the solution to this assignment, please use this quiz to test how many of the steps in this assignment you have managed to complete.

Career center

Learners who complete Quick Introduction to Postman and API Testing for Beginners will develop knowledge and skills that may be useful to these careers:

Test Automation Engineer

A Test Automation Engineer specializes in designing, developing, and maintaining automated tests to ensure software quality and efficiency. This course, "Quick Introduction to Postman and API Testing for Beginners," is exceptionally relevant for this role, providing core competencies in automating API tests. Learners will master advanced Postman features for writing API tests with JavaScript, organizing them into collections, and running them automatically using the Collection Runner and Newman, the Postman CLI tool. These proficiencies are indispensable for integrating API tests into continuous integration pipelines, enabling rapid feedback on API changes, and ensuring the ongoing reliability and performance of backend services, making this course a direct path to success in test automation.

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Quality Assurance Engineer

A Quality Assurance Engineer is critical in ensuring software products meet expected standards before release. This role involves meticulous testing to identify defects and ensure functionality, performance, and reliability. This course provides a robust introduction to Postman and API testing, essential tools for this career path. Learners will gain hands-on experience using Postman to create and inspect API requests, understand HTTP methods and responses, and troubleshoot status codes. These skills are vital for any Quality Assurance Engineer needing to validate backend services and integrations, directly impacting product quality and user satisfaction. The ability to write basic API tests and organize them in collections, as taught in this course, is particularly advantageous for initiating comprehensive testing strategies.

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API Developer

An API Developer specializes in designing, building, and maintaining Application Programming Interfaces for various services and applications. This course is exceptionally well-suited for an API Developer, as it focuses on Postman, an industry-standard tool for API development and testing. Learners will gain hands-on experience crafting requests, utilizing HTTP methods like GET, POST, PATCH, and DELETE, managing authentication, and working with JSON data. The ability to write and run API tests with JavaScript directly supports the development lifecycle, allowing API Developers to validate their work iteratively, ensure API contracts are met, and provide reliable, well-tested interfaces for other systems to consume.

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Backend Developer

A Backend Developer focuses on building the server-side logic, databases, and APIs that power applications. For a Backend Developer, it is crucial to understand how APIs function, how they are consumed, and how to ensure their robustness. This course provides practical experience using Postman for developing and testing APIs. It covers vital topics such as HTTP methods, query parameters, path variables, and JSON data exchange, all fundamental for API construction. The ability to write and run API tests with JavaScript also allows developers to validate their API endpoints during development, ensuring they meet specifications and behave as intended, leading to higher quality and more reliable backend services.

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Integration Engineer

An Integration Engineer specializes in connecting disparate software systems and ensuring seamless data flow between them, primarily through APIs. This course provides highly relevant skills for an Integration Engineer, offering a practical introduction to working with APIs using Postman. Learners will understand HTTP messages, different HTTP methods like GET, POST, PATCH, and DELETE, and how to handle authentication and JSON data exchange. These are foundational concepts for designing, implementing, and troubleshooting system integrations. The ability to use Postman to quickly create requests, inspect results, and even write basic API tests to validate connections helps ensure robust and reliable data exchange across integrated platforms.

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Full-Stack Developer

A Full Stack Developer possesses expertise across both frontend and backend development, making seamless interaction with APIs a daily requirement. This course offers highly relevant skills for a Full Stack Developer by providing a practical introduction to Postman and API testing. Understanding how to construct and inspect API requests, manage different HTTP methods, and handle authentication with tokens, all covered in this course, is vital for both consuming APIs from the frontend and developing them on the backend. The ability to write basic API tests also enables them to ensure the stability of the entire application stack, from database to user interface, accelerating development and improving system reliability.

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Software Developer

A Software Developer builds and maintains applications, often interacting with various internal and external services through Application Programming Interfaces or APIs. This course offers a valuable foundation for a Software Developer by demystifying API interactions and providing practical skills in using Postman. Understanding how to construct and inspect API requests, utilize different HTTP methods, and manage authentication mechanisms, all covered in the course, is crucial for integrating services effectively. The ability to write and run basic API tests with JavaScript also supports debugging and ensuring the stability of the APIs they develop or consume, helping to accelerate development cycles and improve code quality.

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Automation Engineer

An Automation Engineer focuses on designing and implementing automated processes and workflows across various domains, often leveraging scripting and tools to achieve efficiency. This course provides highly relevant skills for an Automation Engineer due to its strong emphasis on automating API testing using Postman. Learners will develop proficiency in writing API tests with JavaScript, organizing them into collections, and most importantly, running these tests automatically using the Postman Collection Runner and Newman, the Postman CLI tool. These capabilities are crucial for building automated checks, integrating API-driven tasks into scripting pipelines, and ensuring the reliability of automated systems that interact with APIs.

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DevOps Engineer

A DevOps Engineer bridges development and operations, focusing on automating software delivery and infrastructure management. A solid understanding of APIs and automated testing is paramount in this role. This course, with its emphasis on Postman and API testing automation, may be useful for a DevOps Engineer by providing hands-on skills in running API tests using the Postman Collection Runner and Newman, the Postman CLI tool. These capabilities are directly applicable to integrating API tests into continuous integration and continuous delivery pipelines, thereby automating quality checks and ensuring the reliability of deployments. This foundation helps streamline workflows, monitor API health in production, and foster robust system integrations.

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Site Reliability Engineer

A Site Reliability Engineer focuses on ensuring the reliability, availability, and performance of large-scale systems. API interactions are central to modern distributed systems, making a deep understanding of them crucial for an SRE. This course may be helpful for a Site Reliability Engineer by providing practical skills in using Postman to interact with and test APIs. Learners will understand HTTP messages, status codes, and how to troubleshoot API responses. This knowledge is essential for developing robust monitoring and alerting systems, diagnosing production incidents related to API failures, and verifying the health of API endpoints through automated checks, contributing to overall system stability.

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Technical Support Engineer

A Technical Support Engineer assists customers with technical issues, often involving complex software systems and integrations. For this role, understanding how APIs function is increasingly vital for diagnosing and resolving problems. This course may be helpful for a Technical Support Engineer by introducing them to Postman, a powerful tool for interacting with and inspecting APIs. Learners will gain proficiency in creating requests, understanding HTTP status codes, and inspecting responses to diagnose connectivity issues or incorrect data exchanges. This practical knowledge enables them to efficiently reproduce customer issues, verify API behavior, and communicate technical details effectively, leading to faster problem resolution and improved customer satisfaction.

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Technical Writer

A Technical Writer is responsible for creating clear, accurate, and comprehensive documentation for software products, including API documentation. For a Technical Writer, a practical understanding of how APIs function is invaluable for producing high-quality content. This course may be useful by providing a hands-on introduction to Postman and API interactions. Learners will understand HTTP methods, parameters, headers, and JSON responses, enabling them to describe API endpoints precisely. The ability to use Postman to test and verify API behavior ensures that the documentation accurately reflects the API's functionality, making it easier for developers to integrate and use the documented APIs effectively.

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Solutions Architect

A Solutions Architect designs and oversees the implementation of complex technical solutions, often involving multiple interconnected systems that communicate via APIs. For a Solutions Architect, a comprehensive understanding of API principles and interactions is crucial for making informed design decisions. This course may be useful by providing a quick and practical introduction to APIs and Postman, offering insights into HTTP methods, authentication mechanisms, and JSON data formats. While this role typically requires an advanced degree, the course helps build a foundation in understanding API capabilities and limitations. This knowledge aids in conceptualizing robust system architectures and evaluating API designs for scalability, security, and performance.

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Technical Product Manager

A Technical Product Manager defines product strategy, roadmaps, and features for technology products, often working closely with engineering teams. While not a hands-on coding role, understanding the technical underpinnings of APIs is increasingly important to define clear requirements and collaborate effectively. This course may be useful for a Technical Product Manager by providing a practical overview of APIs and Postman. Learners will grasp core concepts such as HTTP methods, query parameters, authentication, and JSON structures. This knowledge helps in articulating API-driven features, understanding technical feasibility, and communicating with developers about API capabilities and limitations, leading to better product definition and execution.

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Data Engineer

A Data Engineer designs, builds, and maintains data pipelines and infrastructures for collecting, processing, and storing large datasets. Often, these tasks involve integrating data from various external and internal services via APIs. This course may be useful for a Data Engineer by providing a practical introduction to interacting with APIs using Postman. Learners will gain an understanding of HTTP methods, query parameters, and how to read and write JSON data, which are fundamental for extracting and transforming data from API sources. This hands-on experience helps in efficiently exploring API endpoints for data acquisition and validating the integrity of data ingested through API connections.

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