Synechron Node Js Backend Developer Interview Questions and Answers

It was related to Basic HTML and Node. Some questions are from regioning.

Q1. Given three tables Employee (Which contains employees' IDS and name), Project(Which contains IDs and name), and allocation (Which contains links employee to project via their IDs).Write a query to return a...read more
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Q1. Event loop in Node.js
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Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations and executing callbacks.

• It allows Node.js to perform non-blocking operations efficiently.

• Event loop continuously checks the event queue for new events to process.

• Example: setTimeout function in Node.js uses event loop to schedule the callback function to b
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Q2. Process.nextTick vs SetIntermediate
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process.nextTick is used to defer the execution of a callback function until the next iteration of the event loop, while SetImmediate is used to execute a callback function immediately after the current event loop.
• process.nextTick is more efficient for executing code asynchronously in the same phase of the event loop.

• SetImmediate is better suited for executing code asynchronously in the next iteration of the event loop...read more
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Q1. What is nodejs, explain the event loop.
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Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript on the server-side.
• Node.js is event-driven and non-blocking I/O model.

• It uses an event loop to handle asynchronous operations.

• The event loop is a continuously running process that waits for events and executes callbacks.

• Callbacks are functions that are called when an event occurs, such as a request completing ...read more
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Q2. What is event loop ?
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Event loop is a mechanism that allows Node.js to perform non-blocking I/O operations.
• Event loop is a single-threaded loop that constantly checks for new events in the event queue.

• It executes the callback functions associated with the events in the queue.

• It allows Node.js to handle multiple requests simultaneously without blocking the execution of other requests.

• It is responsible for managing the order of execution of t...read more
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Q3. What is the role of libuv ?
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libuv is a multi-platform support library with a focus on asynchronous I/O.
• libuv provides event loop, thread pool, timer, and file system APIs.

• It is used by Node.js to handle I/O operations in a non-blocking way.

• libuv abstracts the differences between operating systems and provides a consistent API.

• It also supports network programming and inter-process communication.

• Examples of libuv-based applications include Node.js,
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Q1. What is the difference between cluster and thread ?
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Cluster is a group of processes that share the same resources while thread is a lightweight process that shares the same memory.
• Cluster is used for scaling and load balancing while thread is used for improving performance.

• Cluster can run on multiple machines while thread runs within a single process.

• Cluster requires inter-process communication while thread does not.

• Examples of cluster include PM2 and Node.js cluster mo...read more
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Q1. Basics of Java, Spring boot and microservices
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Q1. Java8, spring boot, microservices question at medium level tuff.
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