Array.push not saving using csvtojson

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I’m using the csvtojson library to convert a csv to a json object and then push to an array. However, when I console.log(data) the array, it is empty but when I console.log(data) in csv({}) it does show the array with the jsonobj inside.

Thanks so much!

What I have tried:

I've tried using async/await function but I'm still having trouble saving the data.

const csvFilePath = 'myCsv.csv'; 
let data = [];
async function convertCsv(csvData) {
    const jsonArray= await csv({noheader: true, headers: headers}).fromFile(csvData).on('json', (jsonObj) => { 
    
        data.push(jsonObj); // Push each object to data Array
        console.log('data',data);
        
    })
    return jsonArray;
}

async function run() {
    let dat = await convertCsv(csvFilePath).then(dat => data.push(dat))
    return dat;
  }
  
  run()
console.log(data);

Posted 11-Nov-20 7:03am

ynjay

Updated 11-Nov-20 23:39pm

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Richard Deeming · Accepted Answer · 2020-11-11T23:39:00

Solution 1

Quote:

JavaScript

async function run() { ... }

run();
console.log(data);

You're logging the data before the function has finished executing.
async function - JavaScript | MDN[^]

You need to wait for the function to finish before you can access its output. The simplest way to do that is to move your console.log line inside the async function:

JavaScript

async function run(){
    let dat = await convertCsv(csvFilePath);
    data.push(dat);
    console.log(data);
    return dat;
}

run();

Posted 11-Nov-20 23:39pm

Richard Deeming

Comments

ynjay 12-Nov-20 9:17am

Thanks so much! Is there a way to save the data into a variable outside the function so I can use it in other parts of the code?

Richard Deeming 12-Nov-20 11:55am

You're already doing that. But you can't access the data before it is assigned, which means you need to wait for the async function to finish running first.