JSFiddle - React, Tailwind, and code Playground

JavaScript

const toInt = (val) => parseInt(val, 10);
const toBool = (val) => val === "true";
const toString = (val) => val;

const OPTIONS = [
	{
    	name: 'width',
        default: 2,
        convert: toInt,
    },
    {
    	name: 'format',
        default: 'auto',
        convert: toString,
    },
    {
    	name: 'flat',
        default: false,
        convert: toBool,
    },
];

const DEFAULTS = {};
const OPTIONS_MAP = new Map(OPTIONS.map(param => {
	DEFAULTS[param.name] = param.default;
	return [param.name, param];
}));

const test = {
	width: '4',
    format: 'CODE128',
    flat: 'true',
};

function optionsFromStrings(options) {
	Object.keys(options).forEach(key => {
    	const opt = OPTIONS_MAP.get(key);
        if (opt && opt.convert) {
        	options[key] = opt.convert(options[key]);
        }
	});
	return options;
}

console.log(optionsFromStrings(test));