function getField() {
    let fname = ''
    let tableName = arguments[0]
    let callback
    let key

    if (arguments.length === 3) {
        fname = path.join(userData, tableName + '.json');
        callback = arguments[2];
        key = arguments[1]
    } else if (arguments.length === 4) {
        fname = path.join(arguments[1], arguments[0] + '.json');
        callback = arguments[3];
        key = arguments[2]
    }

    let exists = fs.existsSync(fname)

    if (exists) {
        let table = JSON.parse(fs.readFileSync(fname));
        const rows = table[tableName]
        let data = []

        for (let i = 0; i < rows.length; i++) {
            if (rows[i].hasOwnProperty(key)) {
                data.push(rows[i][key])
            }
        }

        callback(true, data)

    } else {
        callback(false, 'The table you are trying to access does not exist.')
        return
    }
}