Node.js util.types.isUint8Array() Method Last Updated : 28 Apr, 2025 Comments Improve Suggest changes Like Article Like Report The util.types.isUint8Array() method of the util module which is primarily designed to support the needs of Node.js own Internal APIs. It is used to check whether the passed instance in the method is a built-in Uint8Array instance or not. Syntax: util.types.isUint8Array( value ) Parameters: This method accepts a single parameter value that holds any value, i.e instance of any module. Return value: This method returns a Boolean value, i.e true if the passed value is an instance of Uint8Array otherwise returns false. The below examples illustrate the use of util.types.isUint8Array() method in Node.js: Example 1: javascript // Node.js program to demonstrate the // util.types.isUint8Array() method // It includes util module const util = require('util'); // Return false as passed instance is of set console.log(util.types.isUint8Array(new Set())); // Return true as passed instance is of Uint8Array console.log(util.types.isUint8Array(new Uint8Array())); Output: false true Example 2: JavaScript // Node.js program to demonstrate the // util.types.isUint8Array() method // It includes util module const util = require('util'); // Making an instance of Uint8Array // of size 2 const array1 = new Uint8Array(2); // Initializing the zeroth element array1[0] = 42; // Returns true as passed instance // is of Uint8Array console.log(util.types.isUint8Array(array1)); // Making an instance of Uint8Array const array2 = new Uint8Array([21, 31]); // Returns true as passed instance // is of Uint8Array console.log(util.types.isUint8Array(array2)); // Making an instance of Uint8Array const array3 = new Uint8Array([21, 31]); // Making another instance of Uint8Array by // passing an instance of Uint8Array const array4 = new Uint8Array(array3); // Returns true as passed instance // is of Uint8Array console.log(util.types.isUint8Array(array4)); // Making an instance of Int16Array of size 2 const array5 = new Int16Array(2); // Initializing the zeroth element array5[0] = 10; // Returns false as passed instance // is of Int16Array console.log(util.types.isUint8Array(array5)); Output: true true true false Reference: https://nodejs.org/api/util.html#util_util_types_isuint8array_value Comment More infoAdvertise with us Next Article Node.js util.types.isUint8Array() Method A akshajjuneja9 Follow Improve Article Tags : Web Technologies Node.js Node.js-util-module Similar Reads Node.js Utility Module The util module in Node.js provides a variety of utility functions that assist with tasks such as debugging, formatting, and inheritance. It includes methods for inspecting objects, formatting strings, and extending classes. Node.js Utility ModuleThe util module offers essential utilities that are n 4 min read Node.js util.callbackify() Method The util.callbackify() method is an inbuilt application programming interface of the util module which is used to run an asynchronous function and get a callback in the node.js.Syntax:Â Â util.callbackify( async_function ) Parameters: This method accepts single parameter as mentioned above and descri 2 min read Node.js util.debuglog() Method The âutilâ module provides âutilityâ functions that are used for debugging purposes. For accessing those functions we need to call them (by ârequire(âutilâ)â). The util.debuglog() (Added in v0.11.3) method is an inbuilt application programming interface of the util module which is used to create a f 3 min read Node.js util.format() Method The util.format() (Added in v0.5.3) method is an inbuilt application programming interface of the util module which is like printf format string and returns a formatted string using the first argument. The formatted string contains zero or more format specifiers in which the corresponding argument v 5 min read Node.js util.inherits() Method The âutilâ module provides âutilityâ functions that are used for debugging purposes. For accessing those functions we need to call them (by ârequire(âutilâ)â). The util.inherits() (Added in v0.3.0) method is an inbuilt application programming interface of the util module in which the constructor inh 3 min read Node.js util.formatWithOptions() Method The util.formatWithOptions() (Added in v10.0.0) method is an inbuilt application programming interface of the util module which is like printf format string and returns a formatted string using the first argument. It is somewhat identical to util.format() method, the exception in this method is that 4 min read Node.js util.inspect() Method The "util" module provides 'utility' functions that are used for debugging purposes. For accessing those functions we need to call them by 'require('util')'. The util.inspect() (Added in v0.3.0) method is an inbuilt application programming interface of the util module which is intended for debugging 7 min read Node util.promisify() Method `util.promisify()` in Node.js converts callback-based methods to promise-based, aiding in managing asynchronous code more cleanly. This alleviates callback nesting issues, enhancing code readability, and simplifying asynchronous operations through promise chaining.Syntax:util.promisify(func)Paramete 2 min read Node.js util.isDeepStrictEqual() Method The "util" module provides 'utility' functions that are used for debugging purposes. For accessing those functions we need to call them (by 'require('util')'). The util.isDeepStrictEqual() (Added in v9.0.0) method is an inbuilt application programming interface of the util module which is an exporte 3 min read Node.js util.deprecate() Method The util.deprecate() (Added in v0.8.0_ method is an inbuilt application programming interface of the util module which wraps fn (which may be a function or class) in such a way that it is marked as deprecated. When util.deprecate() method is called, it returns a function that emits a DeprecationWarn 3 min read Like