CODEWITHSUNDEEP
javascriptnode.jsasynchronousasync-awaites6-promise
Nick
Nick

Reputation: 1

How do I achieve my requirement of synchronus execution in Node.js

I've a requirement where I have to call another function for a record of data before I actually perform next set of operations.

so here's what I'm doing but it doesn't work. function a is stored in a common library abc

var a = (req,callBack) =>{
DB Operation
.
.
.
.
callBack(null,result);
}

var b = (req,callBack) =>{
const c = await abc.a(req,response);
DB Operation
.
.
.
.
.
callBack(null,result);
}

when I do const c = await abc.a(req,response); it gives me error "await is only valid in async function" but I've seen examples where await is used like this.

can you please help me with this.

Upvotes: 0

Views: 72

Answers (3)

Steven Spungin
Steven Spungin

Reputation: 29159

await is only valid if the called function returns a promise, or is marked async.

Furthermore, await must be used from within an async function.

Both are false in your case.

Don't use async/await...

var b = (req,callBack) =>{
 abc.a(req,c=>{
  DB Operation
  callBack(null,result);
 });
}

You can wrap your functions inside async functions if you insist on using that syntax.

Upvotes: 0

ucode
ucode

Reputation: 71

You'r code would like.

async function a () {
  const b = await funcX()
}

or

const b =  async () => {
  const b = await funcX()
}

like that

Upvotes: 0

shubham-gupta
shubham-gupta

Reputation: 208

You are not using async/await properly. Await only works inside async functions. So make your function async.

var b = async (req,callBack) =>{ // made this function async
    abc.a(req, (_, res) => {
        DB Operation
        .
        .
        .
        .
        .
        callBack(null,result);
    });
}

Upvotes: 1

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