Javascript question Closure and its implementation How many types of stream you know in node How many packages comes from core of node Inheritance kaise achieve kr sakte How node js handle multiple task as it is single thread language Async - defer, what will happen if we write the script in head vs in the body Sql and nosql, difference and which one to use what The Four Types of Streams Readable: Streams from which data can be consumed (e.g., fs.createReadStream(), HTTP requests on a server). Writable: Streams to which data can be written (e.g., fs.createWriteStream(), HTTP responses to a client). Duplex: Streams that are both Readable and Writable (e.g., a TCP Socket). Transform: A type of Duplex stream that modifies or transforms data as it is read/written (e.g., zlib.createGzip() for compression). Call apply bind middleware in node js Node questions Flex and grid use Inline vs block vs Meta tags Normalization & denormalization HOC CLS - in web performance, learn it in better way How will you improve the performance Meta tag Render and hydrate Instead of next.js can we use the node Express with react for custom SSR if not using Next.js - express.js + ReactDOMServer.renderToString() + hydrate() LRU cache Code the LRU Cache - linklist how it used EC2 vs Lambda Ec2 equivalent to azure virtual machine Lambda equivalent to Azure function API gateway - handles authorization Authentication vs Authorization ID token vs access token vs refresh token