REST Assured API Testing with Java – Manual & Automation

Discover what an API is, why it’s needed, and how it acts as a mediator between applications, illustrated by a restaurant waiter and travel portals.

Learn why APIs and web services enable real-time flight data from airlines; see how MakeMyTrip uses Indigo's API via authenticated interfaces instead of direct database access.

Explore api architecture by tracing a client request—from a laptop, desktop, or mobile device, through authentication and validation on the application server, to database access and the resulting response.

Explain how an API provides pre-written code you call to perform features. All web services are APIs, but not all APIs are web services, since web services require internet.

Explore the basics of http as the foundation of the web, a client-server protocol for request and response, and compare rest and soap for web data exchange.

Compare rest and soap through simple, funny examples; see how rest offers speed and lightweight data while soap provides security and bulkier, wrapped XML data for safer server communication.

Compare rest and soap architectures, highlighting soap’s strict standards, wsdl, and xml envelope, versus rest’s lightweight, easy implementation and fewer standards for web-based communication.

Discover how real-time API calls run in an application and watch background requests unfold using the browser's network inspector, enabling manual and automated testing.

Learn manual api testing by directly calling the api to verify functionality, reliability, performance, and security using tools like Postman, including example get user and price checks.

Learn how Postman enables manual and automated api testing by sending requests, viewing responses, using variables and environments, and generating code snippets in the Postman sandbox.

Learn how to test an API using the get method with Postman, create collections and requests, import endpoints, and interpret a 200 OK response that lists employee data.

Learn how to test the put method for API testing by updating a user profile using raw body data, verify 200 responses, and practice on free dummy endpoints.

Learn how to perform partial updates with the patch method in API testing using Postman, including sending request bodies, updating user data by ID, and validating a 200 response.

Explain how a client request to a server results in HTTP status codes, categorized into informational 100, success 200, redirection 300, client errors 400, and server errors 500.

Learn common http status codes and their meanings, from 200 to 500, with the differences between 400, 401, 403, and 404, plus practical fixes.

Learn how rest assured, a Java-based open-source tool, enables API automation by sending HTTP requests and handling JSON responses in a stateless client-server model.

Learn representational state transfer, how rest api uses http for stateless client–server communication, and how get, post, put, delete, and patch manage resources.

Download Oracle Java and install the MSI installer on Windows, then finish the setup. Copy the JDK bin path to the system PATH and verify with java --version.

download and install java on mac from the Oracle website, selecting the correct jdk dmg for mac, run the installer, enter your password, and verify with java -version.

Learn to set up a complete API testing environment by configuring dependencies and libraries in a single editor, importing Rest Assured, and creating a simple test class.

Explore RestAssured's given–when–then syntax for building readable api tests, covering request setup (headers, params, body, cookies) and verifications for get, post, put, and delete operations.

Automate a basic api get request using rest assured and fetch user details from a tested api. Verify the response status code 200 and extract key fields.

Automate path parameter examples using rest assured to fetch and print API responses, compare path and query parameters, and illustrate with get all users and endpoint details.

Learn how to automate a basic post api using Postman and Rest Assured, including setting headers, body, and the create endpoint, and validating the response.

Delete an employee via a REST API by calling the delete endpoint with a path parameter, replicate using Postman and automate with Rest Assured for beginners.

Learn how to automate a basic patch API using Postman and Rest Assured, including setting endpoint, headers, and body, and validating the 200 status response.