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Articles by Mayank Agarwal
Page 17 of 31
res.append() Method in Express.js
The res.append() method can append a specified value to the HTTP response header field. It creates new headers with the specified values, if it's not already created. The value string can take both a string input or an array.Syntaxres.append( field, [value] )Example 1Create a file with the name "resAppend.js" and copy the following code snippet. After creating the file, use the command "node resAppend.js" to run this code as shown in the example below −// res.append(field, [value]) Method Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app ...
Read Moreres.app Property in Express.js
The res.app property holds a reference to the instance of an Express Application that is being used by the middleware.Syntaxres.appExample 1Create a file with the name "resApp.js" and copy the following code snippet. After creating the file, use the command "node resApp.js" to run this code as shown in the example below −// res.app code Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); var PORT = 3000; // Creating an endpoint app.get('/', function (req, res) { console.log(res.app.get('views')); ...
Read Morereq.path Property in Express.js
The req.path property contains the path part of the requested URL. This property is widely used to track the incoming requests and their paths. It is mainly used for logging the requests.Syntaxreq.pathExample 1Create a file with the name "reqPath.js" and copy the following code snippet. After creating the file, use the command "node reqPath.js" to run this code as shown in the example below −// req.path Property Demo Example // Importing the express & cookieParser module var cookieParser = require('cookie-parser'); var express = require('express'); // Initializing the express and port number var app = express(); // Initializing ...
Read Moreapp.enabled() Method in Express.js
The app.enabled() method checks whether a setting name property is enabled or not. It basically checks the value of a setting name and returns True if the property value is also True.Syntaxapp.enabled( name )Example 1Create a file with the name "appEnabled.js" and copy the following code snippet. After creating the file, use the command "node appEnabled.js" to run this code as shown in the example below −// app.enabled() Method Demo Example // Importing the express module const express = require('express'); // Initializing the express and port number var app = express(); // Initializing the router from express ...
Read MoreNode.js - process.disconnect() Method
When a Node.js process is spawned with an IPC channel, the process.disconnect() method will close that IPC channel to the parent process, allowing the child process to exit or finish gracefully. The process will exit once there are no other connections keeping it alive.Syntaxprocess.disconnect()Example 1Create two files with the names "parent.js" and "child.js" and copy the following code snippets. After creating the file, use the command "node parent.js" to run parent.js.parent.js// process.channel Property Demo Example // Importing the child_process modules const fork = require('child_process').fork; // Attaching the child process file const child_file = 'child.js'; // Spawning/calling child ...
Read MoreNode.js - dnsPromises.resolve6() Method
The dnsPromises.resolve6() method uses the DNS protocol to resolve the IPv6 addresses (AAAA records) for the hostname. The promise is resolved with an array of IPv6 addresses.Syntaxdns.resolve6(hostname, [options])Parametershostname – This parameter takes input for hostname to be resolved.options – It can have the following options −ttl – It defines the Time-To-Live (TTL) for each record.Example 1Create a file with the name "resolve6.js" and copy the following code snippet. After creating the file, use the command "node resolve6.js" to run this code as shown in the example below −// dns.resolve6() Demo Example // Importing the dns module const dns = ...
Read MoreNode.js - dns.resolveMx() Method
The dns.resolveMx() method uses the DNS protocol to resolve mail exchange (MX) records for the hostname. The addresses argument passed to the callback function will contain an array of objects containing both the priority and exchange objects.Syntaxdns.resolveMx(hostname, callback)Parametershostname – This parameter takes input for hostname to be resolved.callback – This function will catch errors, if any.records – Returns Mx records for the hostname.Example 1Create a file with the name "resolveMx.js" and copy the following code snippet. After creating the file, use the command "node resolveMx.js" to run this code as shown in the example below −// dns.resolveMx() Demo Example ...
Read MoreNode.js - process.report.directory Property
The process.report.directory property is used to get or set the directory where the report is written. The default value is the empty string that indicates the reports are written to the current working directory of the Node.js Process.Syntaxprocess.report.directoryExample 1Create a file with the name "directory.js" and copy the following code snippet. After creating the file, use the command "node directory.js" to run this code as shown in the example below −// process.report.directory Property Demo Example // Importing the process module const process = require('process'); // Assigning a directory to store process.report.directory = "/tutorialsPoint" // Printing the result ...
Read MoreNode.js - dnsPromises.resolveMx() Method
The dnsPromises.resolveMx() method uses the DNS protocol to resolve the mail exchange records (MX Records) for the hostname. The promise is resolved with an array of objects containing both a priority and exchange property on success.SyntaxdnsPromises.resolveMx( hostname )where, hostname is the parameter that takes the input for the hostname to be resolved.Example 1Create a file with the name "resolveMx.js" and copy the following code snippet. After creating the file, use the command "node resolveMx.js" to run this code as shown in the example below −// dns.resolveMx() Demo Example // Importing the dns module const dns = require('dns'); const ...
Read MoreNode.js - dns.resolveCname() Method
The dns.resolveCname() method uses the DNS protocol to resolve CNAME records for the hostname. The addresses argument passed to the callback function will contain an array of canonical records in an array.Syntaxdns.resolveCname(hostname, callback)Parametershostname – This parameter takes the input for the hostname to be resolved.callback – This function will catch errors, if any.addresses – Returns CNAME addresses for the hostname.Example 1Create a file with the name "resolveCname.js" and copy the following code snippet. After creating the file, use the command "node resolveCname.js" to run this code as shown in the example below −// dns.resolveCname() Demo Example // Importing the ...
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