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The req.ips property contains an array of all the IP addresses in the X-Forwarded-For request header value. This property is only populated when the trust proxy setting does not evaluate to False. This header values or IP's can be set either by the proxy or the client.Syntaxreq.ipsExample 1Create a file with the name "reqIps.js" and copy the following code snippet. After creating the file, use the command "node reqIps.js" to run this code as shown in the example below −// req.ips Property Demo Example // Importing the express & cookieParser module var cookieParser = require('cookie-parser'); var express = require('express'); ... Read More
req.ip consists of the remote IP address from where the request is received. The value of this property is taken from the leftmost entry in the x-forwarded-for header when the trust proxy settings are not set to False. The headers are set by the client or proxy.Syntaxreq.ipExample 1Create a file with the name "reqIp.js" and copy the following code snippet. After creating the file, use the command "node reqIp.js" to run this code as shown in the example below −// req.ip Property Demo Example // Importing the express & cookieParser module var cookieParser = require('cookie-parser'); var express = require('express'); ... Read More
The req.baseUrl property returns the router instance where this URL path is mounted. This property is similar to the mountpath property of the app object, except for the difference that app.mountpath returns the matched path patterns.Syntaxreq.baseUrlExample 1Create a file with the name "reqBaseUrl.js" and copy the following code snippet. After creating the file, use the command "node reqBaseUrl.js" to run this code as shown in the example below −// req.baseUrl Property Demo Example // Importing the express var express = require('express'); // Initializing the express and port number var app = express(); // Initializing the router from express ... Read More
Flash WeldingFlash welding, also called flash butt welding, is a resistance welding process, in which the ends of the workpieces are pressed together and a heavy electric current is passed through the joint during the welding process.In flash welding, the electrical current is applied to the workpieces before they are brought together so that when they meet arcing (or flashing) takes place.Parts of Flash WeldingThe main parts of the flash welding process are described below −Power Supply – An AC power supply is used to provide power for the flash welding or flash butt welding.Welding Transformer – A welding transformer ... Read More
The res.end() method ends the current response process. This method is used to quickly end the response without any data. If one needs to respond with data, they should use either the res.send() method or the res.json() method.Syntaxres.end([data], [encoding])Default encoding is 'utf-8'.Example 1Create a file with the name "resEnd.js" and copy the following code snippet. After creating the file, use the command "node resend.js" to run this code as shown in the example below −// res.end() Method Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); ... Read More
What is Electrolysis?The process of electrolysis can be defined in many ways −A technique that uses a direct electric current to stimulate a non-spontaneous chemical reaction is known as electrolysis.In other words, the process in which ionic substances are decomposed into simple substances by passing an electric current through them is known as electrolysis.Or, electrolysis is the process based on the fact that electrical energy can produce chemical changes, i.e., it can cause a chemical reaction to happen.Principle of ElectrolysisThe principle of electrolysis is based on the term "Electrolyte". An electrolyte is a substance containing free ions that make the ... Read More
The 'shortId' package from NPM can be used to create short non-sequential URL-friendly unique ID's. By default, it returns a 7-14 URL-friendly characters from the following categories: "A-Z, a-z, 0-9, _, -". This package also supports clusters (automatically), custom seeds, and custom alphabets. It can generate any number of ID's without duplication.SyntaxSetting up the NPM project:npm init -yInstalling the 'shortId' dependency:npm install express shortidImporting shortId:const short = require('shortid');Example 1Create a file with the name "shortId.js" and copy the following code snippet. After creating the file, use the command "node shortId.js" to run this code as shown in the example below ... Read More
In Express.js, you can directly use the req.query() method to access the string variables. As per the documentation, the req.param method only gets the route parameters, whereas the req.query method checks the query string parameters. For example, "?id=12" checks urlencoded body params.Syntaxreq.query( )Example 1Create a file with the name "reqQuery.js" and copy the following code snippet. After creating the file, use the command "node reqQuery.js" to run this code as shown in the example below −// req.query() Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); ... Read More
The req.acceptsLanguage() method returns the first accepted language out of the specified languages based on the request's Accept-Language HTTP header field. This method returns 'false' if none of the specified language is accepted.Syntaxreq.acceptsLanguage ( lang, [...] )Example 1Create a file with the name "reqLang.js" and copy the following code snippet. After creating the file, use the command "node reqLang.js" to run this code as shown in the example below −// req.acceptsLanguage(lang, [...]) Method Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); // Initializing the ... Read More
The req.acceptsCharsets() method returns the first accepted charset of the specified charset sets. These charsets are based on the request's Accept-Charset HTTP header field. By default, it returns 'false' if none of the specified charsets is accepted.Syntaxreq.acceptsCharsets ( charset, [...] )Example 1Create a file with the name "reqAcceptsCharsets.js" and copy the following code snippet. After creating the file, use the command "node reqAcceptsCharsets.js" to run this code as shown in the example below −// res.acceptsCharsets(lang, [...]) Method Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); ... Read More