CDL 051 - REST API Interview Q&A (Node.js & Express): JWT, CORS, and Middleware Explained скачать в хорошем качестве

CDL 051 - REST API Interview Q&A (Node.js & Express): JWT, CORS, and Middleware Explained

This comprehensive description is designed to maximize search visibility and inform potential viewers about the in-depth content covered in the video, focusing heavily on the technical and interview preparation aspects. *** 🚀 REST API Interview Q&A | TOP 10 Must-Know Questions (Node.js & Express Practical Demo) Are you preparing for a Node.js or JavaScript developer interview? This session focuses on the most *frequently asked and fundamental concepts* related to REST APIs, complete with practical, hands-on examples using Node.js and Express. We break down complex topics and show you exactly how to implement them, ensuring you are ready for any technical challenge. This video provides the practical answers you need to ace your interview! What We Cover: *1. REST API Fundamentals & Setup:* *What is a REST API?* We define it as a light-weight web service allowing communication between a client (like a browser) and a server using HTTP/HTTPS protocols. *Building a Basic Endpoint:* Practical demonstration of creating a simple API endpoint (`/products`) using Node.js and the Express framework,. *Understanding NPM:* Detailed explanation of *NPM (Node Package Manager)* as a repository where developers upload and download necessary packages and libraries, similar to an App Store,. *2. Essential HTTP Methods (CRUD Operations):* We deeply explore the four primary methods used in REST APIs: GET, POST, PUT, and DELETE. *GET:* Used to fetch product lists or details of a single product (by passing the ID as a parameter) in an Array of JSON format. *POST:* Used to create and insert new data (e.g., a new product) into the database by passing the data to the API from the client,. *PUT:* Used to update an existing record, requiring both the endpoint and the specific ID of the record being modified,. *DELETE:* Used to remove an existing record by passing the specific record ID along with the endpoint. *3. Advanced Concepts for Interview Success:* *Middleware Explained:* Learn what middleware is—a function that executes before the main functionality of an endpoint is reached. We demonstrate how to use middleware for crucial tasks like **authentication and authorization**, allowing you to stop unauthorized requests using status codes like `401 Unauthorized` before they hit your core logic,. *Handling CORS Errors:* We solve the common *Cross-Origin Resource Sharing* issue that occurs when your front-end and back-end applications are running on different origins or ports,. Learn how to install and integrate the `cors` package as middleware to enable cross-origin sharing and allow requests,,. *Securing Your API with JWT:* Practical implementation of *JSON Web Token (JWT)* for securing web services. We demonstrate how to *sign (create) a token* using `jwt.sign` and verify/decode a token using `jwt.verify` and a *secret key* to ensure the token is valid,. We also show how to add an expiration time to the token. *Status Codes Discussed:* We review essential HTTP response codes, including `200` (Success), `401` (Unauthorized), `404` (Not Found), and `500`-level codes (Server-related issues). *Practice is Key!* We encourage you to practice these basic yet highly important concepts, as they are essential for any REST API interview. Let us know in the comments if these examples are working for you! 👍 *Like and Subscribe* for more live developer sessions and advanced programming tutorials!