API Testing Masterclass: Postman, AI, Supertest & CI/CD

Learn how an API acts as a stable contract that models requests, responses, endpoints, and status codes, enabling reliable manual testing, versioning, and safe, cross-device integrations.

Master both REST and SOAP testing by comparing JSON versus XML, using Postman and SoapUI to validate HTTP methods, status codes, and data integrity in enterprise APIs.

Explore REST concepts by mapping resources to routes, using HTTP methods (GET, POST, PUT, PATCH, DELETE), and interpreting status codes and idempotent patterns for reliable testing and debugging.

Explore api routes, base urls, and versioning to access resources, including collection, nested, and action routes, and distinguish route parameters from query parameters while testing edge cases and authentication.

Explore how query parameters refine API responses, support filtering, sorting, pagination, and search, and learn to validate each parameter, encoding, defaults, and edge cases across combinations.

Master api body payload testing with json, validating required versus optional fields, data types, edge cases, and meaningful error responses across post, put, and patch requests.

Learn how JSON underpins API responses, covers objects, arrays, types, and nesting, and master validation with Postman through realistic test assertions and error detection.

Explore how HTTP headers govern authentication, content negotiation, and caching, and learn to validate Content-Type, Accept, Authorization, and Cache-Control headers for reliable API testing.

Explore how http methods define RESTful API behavior, from get to post, put, patch, and delete. Learn how to test correctness, idempotence, status codes, and method restrictions.

Master how HTTP status codes guide API testing, from 1 informational to 5 server errors, and apply precise codes like 200, 201, 204, 400, and 404 to validate responses.

Master how create, read, update, and delete map to post, get, put, patch, and delete, and test end-to-end data flow, status codes, and soft deletion.

Explore how front-end and back-end APIs interact across the stack, test endpoints with postman, handle errors and loading states, and validate end-to-end integration.

Explore frontend api consumption by testing a blog app with devtools, fetch requests, and network inspection, validating create, read, and delete flows against a fake jsonplaceholder api.

Learn to install and sign in to Postman, explore collections, environments, histories, and flows, create and send requests (including get), view responses, and save requests to new collections for reuse.

Create a new Postman workspace for user API testing, build a user management API collection with folders for users, posts, and comments, and add get and post requests using jsonplaceholder.typeecode.com.

Build and save post requests in a Postman collection, then execute get, post, put, patch, and delete operations against jsonplaceholder.typeecode.com to verify responses such as 201 created and 200 OK.

Learn to use variables and environments in Postman, set up development and staging base URLs, and leverage collection variables and scripts to drive dynamic get and delete requests.

Export and share Postman collections and environments as JSON, export and import into new workspaces, and manage sensitive base URL variables for seamless team collaboration.

Set up a simple Express api by creating a project folder and installing Express. Initialize npm, write a basic server, and run it on localhost 3000 with a route.

Create and test base routes for an api using express, including /health and /books, returning json via res.json, and mounting routers for scalable organization.

Implement full CRUD for a books API by wiring an in-memory data array to get, post, put, and delete routes, enabling create, read, update, and delete operations tested with Postman.

Add error handling to the api by validating title and author, returning 400 for missing data, and implementing 404 and global 500 error handling for unknown routes and crash endpoint.

Move the books array to a shared data module, exporting books and a get next id function, then update routes to use the shared counter and test with Postman.

Document an express api using swagger-jsdoc and swagger-ui-express to build an openapi 3.0 spec for a books api, and serve an interactive api-docs interface.

Import OpenAPI specs into Postman to auto-create requests from Swagger docs, and test endpoints like get all books, get by id, create, update, and delete using localhost 3000.

Write Postman test scripts in JavaScript to assert status 200, validate a JSON array, and verify the first book has id, title, and author; save for collection export.

Learn how to chain requests in postman using collection variables, persisting a book ID across requests to create, fetch by ID, update, and delete books, while validating responses.

Set up Postman environments by creating local and staging base URLs, switching between them, and using collection variables to ensure requests point to the correct localhost or staging endpoints.

Explore negative testing and edge cases in api testing with Postman. Validate required fields, various error messages, and status codes such as 400 and 404, and document any discrepancies.

Run a Postman collection with the collection runner against a clean state, sequencing requests to test the books API and report on iterations and results, including negative tests.

Learn data-driven testing with a csv file in Postman, driving multiple iterations of create book requests using csv data and validating title and author per row.

Learn Postman Flows, a visual low-code editor for building API workflows with a drag-and-drop canvas, starting blocks, and HTTP request blocks that connect to the Books API.

Export Postman collections and environments to JSON and separate environment files, then run them with Newman in CI/CD pipelines, generating HTML reports that visualize test results for stakeholders.

Clone the anime list app, install api and client dependencies, and run npm run dev for both. Open api at localhost 3001, client at 5173, and review the swagger docs.

Explore Chrome DevTools network tab to inspect API calls, view JSON responses, understand caching with etag and if-none-match, and test endpoints in Swagger docs.

Explore frontend to API interactions by using the browser network tab and fetch/xhr. Create, update, and delete anime records, observe refresh, front-end validation, and reproduce requests with curl and Postman.

Learn to use har files for debugging by capturing a full user workflow, exporting har, viewing via har viewers, and importing into Postman for bug reporting and reproducible requests.