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Node.js Articles
Page 3 of 22
process.argv() Method in Node.js
The process.argv() method is used for returning all the command-line arguments that were passed when the Node.js process was being launched. The first element will always contains the same value as process.execPath.Syntaxprocess.argv()ParametersSince it returns all the command line arguments passed before the node.js process. It does not need any inputs from the user.ExampleCreate a file with name – argv.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node argv.jsargv.js// Node.js program to demonstrate the use of process.argv // Importing the process module const process ...
Read Morecrypto.createDiffieHellmanGroup() Method in Node.js
The crypto.createDiffieHellmanGroup() is used for creating the DiffieHellmanGroup. This method can also be referred as an alias for crypto.getDiffieHellman.Syntaxcrypto.createDiffieHelmmanGroup(name)ParametersThe above parameters are described as below −name – It takes the input for the group name. The input is of type 'string'.ExampleCreate a file with name – diffieHellmanGroup.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node diffieHellmanGroup.jsdiffieHellmanGroup.js// crypto.createDiffieHellmanGroup Demo Example // Importing the crypto module const crypto = require('crypto'); // Defining the group name const name = 'modp1'; // Creating DiffieHellman group var ...
Read Moreprocess.cpuUsage() Method in Node.js
The process.argv() method is used for getting the user and its cpu usage for the current running process. The data is returned in an object with the properties user and system. The values obtained are in microseconds, i.e.10^-6 seconds. The values returned may be greater than the actual elapsed time if multiple cores are performing work for the running process.Syntaxprocess.cpuUsage([previousValue])ParametersThe method only accepts a single parameter which is defined below −previousValue – This is an optional parameter. This is the previous return value by calling the process.cpuUsage() method.ExampleCreate a file with name – cpuUsage.js and copy the below code snippet. After ...
Read Morecrypto.createSign() Method in Node.js
The crypto.createSign() will create and return a sign object tha uses the passed algorithm in the parameter. One can use, crypto.getHashes() to get the names of all the available digest algorithms. You can create a Sign instance by using the name of the signature algorithms such as 'RHA-SHA256' only in some of the cases, instead of a digest algorithm.Syntaxcrypto.createSign(algorithm, [options])ParametersThe above parameters are described as below −algorithm – It takes the input for the algorithm name to be used while creating the sign object/instance.options – This is an optional parameter that can be used for controlling the stream behaviour.ExampleCreate a file ...
Read Morecrypto.createVerify() Method in Node.js
The crypto.createVerify() will create and return a verify object that uses the passed algorithm in the parameter. One can use, crypto.getHashes() to get the names of all the available signing algorithms. You can create a Verify instance by using the name of the signature algorithms such as 'RHA-SHA256' only in some of the cases, instead of a digest algorithm.Syntaxcrypto.createVerify(algorithm, [options])ParametersThe above parameters are described as below −algorithm – It takes the input for the algorithm name to be used while creating the verify object/instance.options – This is an optional parameter that can be used for controlling the stream behaviour.ExampleCreate a file with ...
Read Morecrypto.getCiphers() Method in Node.js
The crypto.getCiphers() method will return an array that contains names of all the supported cipher algorithms. The crypto package has a huge list of cipher algorithms we can use. But the most used cipher algorithm is 'AES – Advanced Encryption Standard'.Syntaxcrypto.getCiphers()ParametersSince it returns a list of all the cipher algorithms. It does not need to have any input.ExampleCreate a file with name – getCipher.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node getCipher.jsgetCipher.js// A node demo program for getting all cipher algorithms // ...
Read MoreurlObject.auth() Method in Node.js
The auth() property defines the username and password portion of any URL, also called as userInfo. The string and username are separated by a colon ( : ).SyntaxurlOject.auth()ParametersSince it retuns only the username and password from a URL, it does not required any input parameters.ExampleCreate a file with name – auth.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node auth.jsauth.js// Importing the URL module const url = require('url'); var adr = 'https://username=hello:password=tutorialspoint@www.tutorialspoint.com/'; // Parsing the above URL address var q = url.parse(adr, ...
Read Morecrypto.getCurves() Method in Node.js
The crypto.getCurves() method will return an array that contains names of all the supported elliptic curves. The crypto package has a huge list of elliptic curves that can be used for creating Elliptic Curve Diffie-Hellman (ECDH) key exchange objectSyntaxcrypto.getCurves()ParametersSince it returns a list of all the elliptic curves. It does not need any arguments.ExampleCreate a file with name – curves.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node curves.jscurves.js// A node demo program for getting all elliptic curves // Importing the crypto module ...
Read MoreStream writable.writableObjectMode Property in Node.js
The writable.writableObjectMode property is used for getting the objectMode property of the given writable Stream. The property will return 'true' if the object mode is set, else 'false' will be returned.Syntaxwriteable.writableObjectModeExampleCreate a file with name – writableObjectMode.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node writableObjectMode.jswritableObjectMode.js// Program to demonstrate writable.writableObjectMode property // Importing the stream module const stream = require('stream'); // Setting the objectMode to true objectMode: true // Creating a data stream with writable const writable = new stream.Writable({ // ...
Read Morecrypto.getHashes() Method in Node.js
The crypto.getHashes() method will return an array that contains names of all the supported hash algorithms. The crypto package has a huge list of hash algorithms we can use. But the most used cipher algorithm is 'MD5 – Message-Digest Algorithm5 '.Syntaxcrypto.getHashes()ParametersSince it returns a list of all the hash algorithms. It does not need to have any input.ExampleCreate a file with name – getHashes.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −node getHashes.jsgetHashes.js// A node demo program for getting all hash algorithms // ...
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