how to run asynchronous function synchronously in node js

Question

I am Using Express framework.

The problem I am facing is that I have created a var duration and when a request at '/' is received it simply find the total duration of given video and save to that variable but at the end I want to show that variable but instead of showing that variable value it shows nothing and in console in shows undefined...

can anyone please please help me to tun this code synchronously instead of asynchronous...

thanks alot

This is my code

Brajendra Swain · Accepted Answer · 2016-06-19 12:35:17Z

1

to handle the asynchronous code you need to put

console.log(duration);
res.send(duration);

inside the callback of exec.

modified code:

var duration;
app.get('/', function(req, res){
    exec('ffprobe -1 ***', function(){
        if(stdout){
            duration = stdout;
            console.log(duration);
            res.send(duration);
        }
    });
});

edited Jun 19, 2016 at 12:35

answered Jun 19, 2016 at 10:16

Brajendra Swain

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2 Comments

Robbie Over a year ago

This solves the problem, but it's worth mentioning that it doesn't "make the code synchronous". It fixes the previously incorrect asynchronous handling.

Brajendra Swain Over a year ago

thanks for the correction @Robbie - yes!! the code is still asynchronous, now it is just handled correctly. (edited the answer)

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