Server Side Programming Articles - Page 511 of 2650

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

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

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

We need to get the DNS information to track the address from where we receive the requests. This feature also provides an added layer of security, protecting the application from different type of DOS and DDOS attacks.We can use the following functions to get the domain and host information.SyntaxGetting the origin info:var origin = req.get('origin');Getting the host info:var host = req.get('host');Example 1Create a file with the name "dnsInfo.js" and copy the following code snippet. After creating the file, use the command "node dnsInfo.js" to run this code as shown in the example below −// Getting the Host info Demo Example ... 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

The req.accepts() method checks if the specified content-types are acceptable by the request's Accept HTTP header fields. This method returns the best match, and returns False if none of the specified content types is acceptable.The type values can be a MIME type like application/json, or an extension name like json.Syntaxreq.accepts( types )Example 1Create a file with the name "reqAccepts.js" and copy the following code snippet. After creating the file, use the command "node reqAccepts.js" to run this code as shown in the example below −// req.accepts() Method Demo Example // Importing the express module var express = require('express'); // ... Read More