I'd like to make an array from a file, like this:
'use strict';
const fs = require('fs');
var results = [];
fs.readFile('myfile.json', (err, data) => {
if (err) throw err;
results = JSON.parse(data);
//console.log(results); This works file
});
console.log('results length:', results.length);
for ( r in results) {
console.log('res', r);
console.log(r.configuration.value);
}
I can see the json object is printed out in the console.
However when I want to access outside fs.readFile , I get
results length: 0
And the loop does not itterate.
I'm wondering how can I fix this?
fs.readFile() is asynchronous, and you're trying to use results before it has completed.
Use fs.readFileSync() instead of fs.readFile()
var results = JSON.parse(fs.readFile('myfile.json', {encoding: 'utf8'}));
Read more about Node callbacks. https://nodejs.org/en/knowledge/getting-started/control-flow/what-are-callbacks/
Or, better, try async/await version of fs functions.