javascript random string

stackoverflow.com › questions › 1349404 › generate-a-string-of-random-characters

I think this will work for you:

function makeid(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

console.log(makeid(5));

Answer from csharptest.net on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 1349404 › generate-a-string-of-random-characters

javascript - Generate a string of random characters - Stack Overflow

Top answer

1 of 16

3768

I think this will work for you:

function makeid(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

console.log(makeid(5));

2 of 16

3232

//Can change 7 to 2 for longer results.
let r = (Math.random() + 1).toString(36).substring(7);
console.log("random", r);

Note: The above algorithm has the following weaknesses:

It will generate anywhere between 0 and 6 characters due to the fact that trailing zeros get removed when stringifying floating points.
It depends deeply on the algorithm used to stringify floating point numbers, which is horrifically complex. (See the paper "How to Print Floating-Point Numbers Accurately".)
Math.random() may produce predictable ("random-looking" but not really random) output depending on the implementation. The resulting string is not suitable when you need to guarantee uniqueness or unpredictability.
Even if it produced 6 uniformly random, unpredictable characters, you can expect to see a duplicate after generating only about 50,000 strings, due to the birthday paradox. (sqrt(36^6) = 46656)

Sentry

sentry.io › sentry answers › javascript › generate random string/characters in javascript

Generate random string/characters in JavaScript | Sentry

This function takes in the length of the random string that you want as an argument and then creates a string output where each character is randomly chosen from the chars variable. In this case, the possible characters in the random string are alphanumeric. Random characters are chosen using Math.random().

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