generate-unique-hash-key

install :
    sudo npm i generate-unique-hash-key --save

require :
    var generateUniqueHashKey = require("generate-unique-hash-key");

use in prehook :

schema.pre("save", function (next) {
    var self = this;

    if (self.status == "Created" && !self["transHash"]) {
        let params = {
            paramsString: "string to check as duplicate",     // ex: self.amount + self.mobile
            orderType: "recharge",
            expiresIn: 3      // In minutes, same paramsString transaction not allowed until minutes expires
        };
        generateUniqueHashKey.generateUniqueCodeRecord(params, function(err,uniqueData) {
            if(err) next(new Error(err));
            else if (uniqueData.isProceed) {
                self["transHash"] = uniqueData.uniqueCode;
                next();
            }
            else next(new Error(uniqueData.message));
        }
    } else {
        next();
    }
});

ex: let params = { paramsString: self.amount + self.mobile + self. orderType: "recharge", expiresIn: 3 // In minutes, same paramsString transaction not allowed until minutes expires };

 Here, next transaction with same amount and mobile number cannot be done until 3 min