The replace() is one of the methods of the string objects and also it must be invoked through the particular object of the string classes in javascript. Then you can access its value directly using the expression you would pass to the switch statement. // Function that replace token from string with equivalent variable value // Receives the string-template. Examples of the above function are provided below. This can be done using two ways. Replacing an element of an Array at a specific index Now that we know how to check if the Array includes a specific element, let's say we want to replace that element with something else. how to update object value in javascript code example Object.values (obj) - returns an array of values. Office Address find and replace value in object javascript. If the regexp uses the global flag (g), the replace() method will call the replacerFunction after every match.. If you can replace null-s with empty strings on serialized string, do something like this: data = JSON.parse (JSON.stringify (data).replace (/\:null/gi, "\:\"\"")); Here's how you should be doing it, replacing the objects values . Replace Item in Array with JavaScript - HereWeCode Not pass anything to replace value in object javascript, it will start from index 0 you find the book #! The JavaScript string replace () method is used to replace a part of a given string with a new substring. Javascript Web Development Object Oriented Programming In order to modify the key values, you need to use regular expressions along with Object.fromEntries(). Object.values() - JavaScript | MDN - Mozilla JavaScript Object Spread Find/Replace object in an array and add a key Javascript The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. Code language: CSS (css) Spread operator vs. Object.assign() The spread operator (.) Update all the Values in an Object in JavaScript # To update all the values in an object: Use the Object.keys method to get an array of the object's keys. The replace () method does not change the original string. This can be either a String or a regular expression. In addition to objects that are predefined in the browser, you can define your own objects. let user = { name: "Alexander" } // this instead copies a reference to the previous object let newUser = user In the above example, we have two variables, each making reference to .