Get usable array from csvtojson

I've seen code examples of using csvtojson, but each one simply outputs the result using console.log(). The following code creates a variable named 'json', but I don't see how I can use this outside of the function creating it. How can I export the variable 'json' for use outside of the function that is creating it?:

const csvFilePath='<path to csv file>'
const csv=require('csvtojson')

csv().fromFile(csvFilePath,function(err,result){

    if(err){
        console.log("An Error Has Occured");
        console.log(err);  
    } 

    var json = result; // I want to use this var outside of this function.
    console.log(json);
});

I was really hoping that it would be as simple as writing something like:

const dataArray = csv().fromFile(csvFilePath);

But, dataArray doesn't contain my data, but instead appears to be an object with parameters about the data.

Any clues will be greatly appreciated!

I've learned a bit about async functions and promises since I posted this question. Since csvjson returns promises, I return the result of csv() to the next function in my chain:

    const csv = require('csvtojson');
    const filePath = '<path to csv file>';

    // previous async function in promise chain
    .then(() => {
      return csv().fromFile(filePath)
    })
    .then(data => { // 'data' contains the json as converted by csv()
      // next step in promise chain
    })