How to Replace String in Node.js - TechvBlogs

How to Replace String in Node.js

Learn the essential techniques for replacing strings in Node.js. Explore methods like String.replace(), regular expressions, and discover the latest features in Node.js 15.0.0 and beyond. Elevate your string manipulation skills and enhance your Node.js development proficiency.

Suresh Ramani - Author - TechvBlogs
Suresh Ramani

1 week ago


Node.js has become a popular platform for server-side development, and manipulating strings is a common task in many applications. Whether you're working with data processing, text parsing, or building a web server, the ability to replace strings is a fundamental skill. In this article, we'll explore different ways to replace strings in Node.js and understand the various methods available for this task.

How to Replace String in Node.js

String.replace() Method

The most straightforward way to replace a string in Node.js is by using the String.replace() method. This method takes two arguments: the substring you want to replace and the new substring you want to insert.

let originalString = "Hello, World!";
let newString = originalString.replace("World", "Node.js");

In this example, the output will be "Hello, Node.js!" as the method replaces the first occurrence of "World" with "Node.js".

Regular Expressions

Node.js supports regular expressions for advanced string manipulation. The String.replace() method can also take a regular expression as its first argument, allowing for more flexible replacements.

let originalString = "Node.js is awesome!";
let newString = originalString.replace(/awesome/, "powerful");

Here, the output will be "Node.js is powerful!" as the regular expression is used to match the word "awesome" and replace it with "powerful".

Global Replacement with Regular Expressions

If you want to replace all occurrences of a substring, you can use the global flag (g) with a regular expression.

let originalString = "Replace me, replace me!";
let newString = originalString.replace(/replace/g, "substitute");

The output will be "Substitute me, substitute me!" as the global flag ensures that all occurrences of "replace" are replaced.

String.replaceAll() Method (Node.js 15.0.0 and later)

Starting from Node.js version 15.0.0, the String.replaceAll() method was introduced, providing a convenient way to replace all occurrences of a substring without using regular expressions.

let originalString = "Replace me, replace me!";
let newString = originalString.replaceAll("replace", "substitute");

This will produce the same result as the previous example, replacing all occurrences of "replace" with "substitute".

Using a Third-Party Library

If you require more advanced string manipulation or additional features, you might consider using a third-party library like lodash or strman. These libraries offer a variety of string manipulation functions, including advanced replace operations.

const _ = require('lodash');

let originalString = "Hello, World!";
let newString = _.replace(originalString, "World", "Node.js");

Ensure to install the library using npm before using it:

npm install lodash


Replacing strings is a common task in Node.js applications, and there are multiple ways to achieve it. Whether you prefer using the built-in String.replace() method, regular expressions, or third-party libraries, understanding these methods will empower you to handle string manipulation efficiently in your Node.js projects.


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