Category: Node JS Interview Question and Answer

Operational errors are not bugs, but create problems with the system like request timeout or hardware failure. On the other hand, programmer errors are actual bugs.

Following is a list of tools that can be used in developing code in teams, to enforce a given style guide and to catch common errors using static analysis.

npm stands for Node Package Manager. Following are the two main functionalities of npm:

Yes, Node.js Crypto module supports cryptography. It provides cryptographic functionality that includes a set of wrappers for open SSL’s hash HMAC, cipher, decipher, sign and verify functions. For example:

In REPL, the underscore variable is used to get the last result.

Yes. You can evaluate simple expressions using Node REPL.

Following are the terms used in REPL with their defined tasks: Read: It reads user’s input; parse the input into JavaScript data-structure and stores in memory. Eval: It takes and evaluates the data structure. Print: It is used to print the result. Loop: It loops the above command until user press ctrl-c twice to terminate.

REPL stands for Read Eval Print Loop. It specifies a computer environment like a window console or Unix/Linux shell where you can enter a command, and the computer responds with an output. It is very useful in writing and debugging the codes. REPL environment incorporates Node.js. See the Example: