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How to Generate Random String in JavaScript?

Sometimes, programmers require to create a string which is generated by selecting the random characters. Random String Generator helps to create a random string by choosing some characters randomly. This string can be a simple character string or an alpha-numeric string.


Syntax:

Math.random()

In this example, the Math.random() method is used to generate random characters from the specified characters (A-Z, a-z, 0-9).


The for loop is used to loop through the number passed into the generateString() function. During each iteration, a random character is generated.



Code:

const characters ='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

function generateString(length) {
    let result = ' ';
    const charactersLength = characters.length;
    for ( let i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }

    return result;
}
console.log("Program to Generate Random String in JavaScript ","\n");
console.log("Random String will be  :",generateString(5));

Output:




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