The replace() method in JavaScript is only replace first occurrence of a substring.

The replace() method accept two parameters.

Example :

const str = "I have Red Car and Red Bike";
const res = str.replace("Red","Blue");
console.log(res); // I have Blue Car and Red Bike.

To Perform a global search to replace all occurrences from a string you can use regular expression with global modifier :

const str = "I have Red Car and Red Bike";
const res = str.replace(/red/gi,'Blue');
console.log(res); // I have a Blue Car and Blue Bike.

Here g means it searches globally in string, and it means it ignoring cases of substring.

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