Promise returns undefined nodejs-CodePudding

Hi i am a newbie to Nodejs and i am trying to return an Object from an async function but promise returns undefined even though the data is fetched, can someone help please? Here is the code:

I am trying to return object from CreateRecoveryDoc function so you guys can ignore RegisterUser function since it just calls CreateRecoveryDoc function

index.js

 async function CreateRecoveryDoc(u,userN,encat,urk){
    const USEKEY = userN
    const ENCAT = encat
    u[USEKEY] = ENCAT
    const data = db.get(ENCAT).put({
        u
    });
    const noderesult = await db.get(urk).once(v =>{
        const res = v
        if (res === ''){
            console.log("Failed to create a recovery doc")
        }
        else{
            console.log("recovery doc created")
            const Jsobject = {CAT:encat,URK:urk}
            // console.log(Jsobject)
            return Jsobject
        }
    
    });
}
exports.RegisterUser = async function RegisterUser(user,pass,email,HID){
    var userN = user //giving username to userN variable

   
    UserUAK = uuidv4()
    console.log("UAK: "   UserUAK)
    
    const EIDD = String(HID.substring(process.env.cutfrom,process.env.to))
    console.log(process.env.cutfrom)
    console.log(process.env.to)
    const ED = EIDD.replaceAll("-","") 
    console.log("EID: "  ED)

   
    const CATTOKEN = uuidv4()
    const CAT = UserUAK   CATTOKEN
    console.log("CAT: "   CAT)
 
    const EDDfraze = ED
    var encrypted = CryptoJS.AES.encrypt(CAT, EDDfraze);  
    console.log("Encryption: "  encrypted.toString()) 
    const encat = encrypted.toString()
    
    const cred = await db.get(UserUAK).put({
        username: user,
        password: pass
    })
    const checkcred = await db.get(UserUAK).once(v =>{
        U_res = v
        if (U_res === ''){
            console.log("Failed to create a User")
        }
        else{
            console.log("Usercreated")
        } 

    })
    
   
    const URK = uuidv4()   process.env.SECRET2    
    console.log("URK: "   URK)
    const defdata = await db.get(URK).put({
        default: 'defaultID'
    })
    const data = await db.get(URK).once(v =>{
        var u = v 
        CreateRecoveryDoc(u,userN,encat,URK) 
    
});

}

Test.js

const Reg = require("./index.js")

var registres = Reg.RegisterUser("WS1DQWD","P@wdqwd","M123123s12","134832487623").then(x=>{console.log(x)})

console.log(registres) //logs undefined

CodePudding user response：

Well, the RegisterUser function executes the actions and retrieves the data. What it doesn't do is return any value. This means it'll return a Promise by default, but this Promise won't have any value to resolve.

Depending on which object you want to have returned, you need to return it or create and return a new Promise from which you can call the resolve-function.

CodePudding user response：

RegisterUser needs to return the jsObect value.

Try replacing the const data = ... statement at the bottom of RegisterUser with the following 3 statements:

let jsObject;
await db.get(URK).once(v =>{
    var u = v 
    jsObject = CreateRecoveryDoc(u,userN,encat,URK) 

});
return jsObject;

Alternatives may exist, but what .once does and returns when called with a function as its argument is a secret (IMHO, after trying to search for it).