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Node.js

memorize.ai (lvl 286)

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Middleware

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Node.js

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Date created

Mar 1, 2020

Cards (14)

Section 1

(14 cards)

Middleware

Front

Layer between

Back

fs module

Front

A built-in module that handles file system

Back

Single page application

Front

Back

URL module

Front

A built-in module that parses URL strings

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Non-blocking

Front

Considered asynchronous

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Built-in Modules

Front

Http, url, fs

Back

Node.js

Front

An open source server environment. It allows you to run JavaScript on the server. Server-side scripting language. https://www.w3schools.com/nodejs/ https://career.guru99.com/top-25-interview-questions-on-node-js/

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How Node.js work

Front

Works on a v8 environment, it is a virtual machine that utilizes JavaScript as its scripting language and achieves high output via non-blocking I/O and single threaded event loop.

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Http module

Front

A built-in module that creates an HTTP server that listens to server ports and gives a response back to the client. Use the createServer() method to create an HTTP server:

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Callback function

Front

A function specified as part of an event listener

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Express

Front

A node framework for URL routing, error handling, middleware and etc

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Semantic Versioning

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Version 1.2.3 1: major - break in functionality 2: minor - added features that don't break functionality 3: patch (fix) - bug fix or patch

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Module

Front

A set of functions you want to include in your application. (Same as JavaScript libraries.) Use require() function with the name of module to include

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Blocking

Front

Blocking is when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes. This happens because the event loop is unable to continue running JavaScript while a blocking operation is occurring.

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