index.js


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function LoadData(data) {
    const objects = JSON.parse(data).cards;
    for (i of objects) {
        console.log(i);
    }
}

function acceptFile() {
    const inp = document.getElementById("inp");
    console.log(inp.files[0]);
    readFileContent(inp.files[0]).then(content => {
        LoadData(content);
    });
}

function readFileContent(file) {
	const reader = new FileReader()
  return new Promise((resolve, reject) => {
    reader.onload = event => resolve(event.target.result)
    reader.onerror = error => reject(error)
    reader.readAsText(file)
  })
}