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Node.js Articles
Page 14 of 22
Node.js – util.types.isGeneratorObject() Method
The util.types.isGeneratorObject() method checks whether the passed value is a built-in generator object or not. If the above condition is satisfied, it returns True, else False. The return value may differ from the original source code if a transpilation tool is used.Syntaxutil.types.isGeneratorObject(value)Parametersvalue − This input value takes input for the required parameter and checks if it's a Generator object or not.It returns True or False based upon the input value passed.Example 1Create a file "isGeneratorObject.js" and copy the following code snippet. After creating the file, use the command "node isGeneratorObject.js" to run this code.// util.types.isGeneratorObject() Demo Example // Importing the ...
Read MoreNode.js – util.types.isDataView() Method
The util.types.isDataView() method checks whether the passed value is a built-in DataView instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isDataView(value)Parametersvalue − This input value takes input for the required parameter and checks if it's a Data View instance or not.It returns True or False based upon the input value passed.Example 1Create a file named "isDataView.js" and copy the following code snippet. After creating the file, use the command "node isDataView.js" to run this code.// util.types.isDataView() Demo Example // Importing the util module const util = require('util'); const buffer = new ArrayBuffer(20); // ...
Read MoreNode.js – util.types.isBigInt64Array() Method
The util.types.isBigInt64Array() method checks whether the passed value is a BigInt64Array instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isBigInt64Array(value)Parametersvalue − This input value takes input for the required parameter and checks if it's a BigInt64 array instance or not.It returns True or False based upon the input value passed.Example 1Create a file named "isBigInt64Array.js" and copy the following code snippet. After creating the file, use the command "node isBigInt64Array.js" to run this code.// util.types.isBigInt64Array() Demo Example // Importing the util module const util = require('util'); // Functions to be passed as parameter // ...
Read MoreNode.js – util.isDeepStrictEqual() Method
The util.isDeepStrictEqual() method as the name suggests, is used for checking whether the two values are deep strict equal or not. If both the values are deep strict equal, true is returned else it returns false.Syntaxutil.isDeepStrictEqual(val1, val2)Parametersval1 & val2 – Both the input parameters can accept class, function, object or a JavaScript primitive value. The above function checks the equality between these two values.Example 1Create a file with the name "deepStrictEqual.js" and copy the following code snippet. After creating the file, use the command "node deepStrictEqual.js" to run this code.// util.isDeepStrictEqual() Demo Example // Importing the util module const util = require('util'); ...
Read MoreNode.js – util.types.isBoxedPrimitive() Method
The util.types.isBoxedPrimitive() method checks whether the passed value is a built-in Primitive object or not. If the above condition is satisfied, it returns True, else False. Primitive object includes new Boolean(), new String() or Object(Symbol()).Syntaxutil.types.isBoxedPrimitive(value)Parametersvalue − This input value takes input for the required parameter and checks if it's a Float32-Array instance or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isBoxedPrimitive.js" and copy the following code snippet. After creating the file, use the command "node isBoxedPrimitive.js" to run this code.// util.types.isBoxedPrimitive() Demo Example // Importing the util module const util ...
Read MoreNode.js – util.callbackify() Method
The util.callbackify() method takes an async function as a parameter (or a function with Promise) and returns a function with the callback style. The callback will hold the rejection reason as the first parameter (or null in case of Promise) and the resolved value as the second parameter.Syntaxutil.callbackify(function)Parametersfunction − The input parameter for the async_function required for callback.Example 1Create a file "callbackify.js" and copy the following code snippet. After creating the file, use the command "node callbackify.js" to run this code.// util.callbackify() demo example // Importing the util module const util = require('util'); // Defining a simple async function ...
Read MoreNode.js – hash.copy() Method
The Hash class is one of the many utility classes that is used for creating the hash digests of data. The hash.copy() method creates a new Hash object that will contain a deep copy of the internal state of the current hash object.Syntaxhash.copy([options])Parametersoptions −This input parameter takes input to control the stream behaviour and therefore will contain the stream.tranformOptions.Example 1Create a file "hashCopy.js" and copy the following code snippet. After creating the file, use the command "node hashCopy.js" to run this code.// hash.update() demo Example // Importing the crypto module const crypto = require('crypto'); // Defining the hash ...
Read MoreHow to Install Newman using NPM?
We can install Newman using npm. Newman can be installed using npm and Node.js. To download Node.js, navigate to the link − https://nodejs.org/en/download/current/.As we have downloaded Node.js successfully, we can check it with the below command −In Windowsnode --vIn Linuxnode --versionThe npm package becomes available automatically on installing Node.js. We can check it with the below command −In Windowsnpm --vIn Linuxnpm --versionFinally to install Newman, run the below command −For Windowsnewman --vFor Linuxnewman --version
Read Morecrypto.privateDecrypt() Method in Node.js
The crypto.privateDecrypt() is used for decrypting the given data content by using a private key passed in the parameter that was previously encrypted using the corresponding public key with crypto.publicEncrypt() method.Syntaxcrypto.privateDecrypt(privateKey, buffer)ParametersThe above parameters are described as below −key – It can contain the below 5 types of data of the following type – Object, String, Buffer or KeyObject.oaepHash – This field contains the hash function to be used for OAEP padding and MGF1. Default value is: 'sha1'.oaepLabel – This field contains the value for OAEP padding. No lable is used if not specified.padding – This is an optional value defined in crypto.constants.buffer – This ...
Read Moresend(), sendStatus() and json() method in Node.js
The send() and json() functions are used for sending the response to the client directly from the server. The send() method will send the data in a string format, whereas the json() function will send the same in JSON format. The sendStatus() method is used for sending the HTTP request status with the client. Possible status values are: 200(Success), 404(Not found), 201(Created), 503(Server Unreachable) etc.PrerequisiteNode.jsExpress.jsInstallationInstall the express module using the below statement −npm install expressExample - sendStatus()Create a file with name – sendStatus.js and copy the below code snippet. After creating file, use the following command to run this code ...
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