Random name when saving the “Save As” dialog box

/*
Save Dialog with Random Name.jsx
Stephen Marsh
v1.0 - 8th February 2025
https://community.adobe.com/t5/photoshop-ecosystem-discussions/random-name-when-saving-the-save-as-dialog-box/td-p/15140230
*/

#target photoshop

try {
    // Use the previously saved path
    var docPath = app.activeDocument.path;
} catch (e) {
    // If unsaved, select the desktop
    var docPath = new Folder("~/Desktop");
}

try {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var descriptor2 = new ActionDescriptor();
    descriptor2.putBoolean(s2t("maximizeCompatibility"), true);
    descriptor.putObject(s2t("as"), s2t("photoshop35Format"), descriptor2);
    descriptor.putPath(s2t("in"), new File(docPath + "/" + uuid() + ".psd"));
    descriptor.putBoolean(s2t("copy"), false);
    descriptor.putBoolean(s2t("lowerCase"), true);
    executeAction(s2t("save"), descriptor, DialogModes.ALL);
} catch (e) { }

function uuid() {
    /* https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid */
    var chars = '0123456789abcdef'.split('');

    var uuid = [],
        rnd = Math.random,
        r;
    uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
    uuid[14] = '4'; // version 4

    for (var i = 0; i < 36; i++) {
        if (!uuid[i]) {
            r = 0 | rnd() * 16;

            uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r & 0xf];
        }
    }

    return uuid.join('');
}

Here is a 1.1 version, which uses an "arguably better" random generator.

/*
Save Dialog with Random Name.jsx
Stephen Marsh
v1.1 - 8th February 2025
https://community.adobe.com/t5/photoshop-ecosystem-discussions/random-name-when-saving-the-save-as-dialog-box/td-p/15140230
*/

#target photoshop

try {
    // Use the previously saved path
    var docPath = app.activeDocument.path;
} catch (e) {
    // If unsaved, select the desktop
    var docPath = new Folder("~/Desktop");
}

try {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var descriptor2 = new ActionDescriptor();
    descriptor2.putBoolean(s2t("maximizeCompatibility"), true);
    descriptor.putObject(s2t("as"), s2t("photoshop35Format"), descriptor2);
    descriptor.putPath(s2t("in"), new File(docPath + "/" + uuid() + ".psd"));
    descriptor.putBoolean(s2t("copy"), false);
    descriptor.putBoolean(s2t("lowerCase"), true);
    executeAction(s2t("save"), descriptor, DialogModes.ALL);
} catch (e) { }


function uuid() {
    // Generate a random UUID based on the current date and time to help ensure uniqueness
    // Digits from the milliseconds, seconds, minutes, hours, day, month, and year are randomly used in that order of preference
    // This ensures a more random, unique name is generated each time the script is run
    // Note: This is not a cryptographically secure UUID generator, but it should be fine for this purpose
    var now = new Date();
    var digits = ("" + now.getMilliseconds() + now.getSeconds() + now.getMinutes() + now.getHours() + now.getDate() + (now.getMonth() + 1) + now.getFullYear()).split("");
    var chars = "0123456789abcdef".split("");
    var uuidTemplate = "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";

    function getRandomChar() {
        return chars[Math.floor(Math.random() * chars.length)];
    }

    function getRandomDigitOrChar() {
        if (digits.length > 0) {
            // Use digit or char with some randomness to ensure better mix
            return Math.random() > 0.5 ? digits.shift() : getRandomChar();
        } else {
            return getRandomChar();
        }
    }

    var uuid = "";
    for (var i = 0; i < uuidTemplate.length; i++) {
        var c = uuidTemplate.charAt(i);
        if (c === "x") {
            uuid += getRandomDigitOrChar();
        } else if (c === "y") {
            uuid += (8 + Math.floor(Math.random() * 4)).toString(16);
        } else {
            uuid += c;
        }
    }

    return uuid;
}