how to use async await in nodejs? error while using async await

Question

I have written google cloud function, which reads file from the bucket and then return the content.

   async function getFileContent(fileName, bucketName) {
      const storage = new Storage();
      const file = await storage.bucket(bucketName).file(fileName);
      file.download(function(err, contents) {
           console.log("file err: "+err);
           console.log("file data: "+contents); //contents is displaying data here
          return contents;
      });
    }
//cloud function starts
    exports.getdata = async function(req, res) {
      var filecontent = await getFileContent("file1", "bucket1");
      console.log("outside "+filecontent); //displaying as undefined
     ));
    }

I want to execute console.log("outside "+filecontent); only once the getFileContent returns value after processing.

Does this answer your question? [How do I return the response from an asynchronous call?](https://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call) — CertainPerformance, Mar 30 '20 at 22:20
You've got an await keyword where you don't need it, and missing await keywords where you do need them. I suggest taking some time to better learn how async/await syntax is meant to work with promises. And be sure to understand how promises are used with the APIs that you're working with. — Doug Stevenson, Mar 30 '20 at 22:22

score 0 · Accepted Answer · answered Apr 16 '20 at 05:45

I have done small mistake here, have to keep await for file.download where as in the query i have mentioned above i have given await at storage.bucket(bucketName).file(fileName);

 async function getFileContent(fileName, bucketName) {
      const storage = new Storage();
      const file = storage.bucket(bucketName).file(fileName);
      content = await file.download(function(err, contents) {
           console.log("file err: "+err);
           console.log("file data: "+contents); //contents is displaying data here
          return contents;
      });
    }

the above code is working fine after making this change. Not sure why it is down voted instead of correcting the mistake.

how to use async await in nodejs? error while using async await

1 Answers1