There's https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent https://developer.mozilla.org/en-US/docs/Web/JavaScr

There's https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe..., but it isn't quite a full solution. Also, URLSearchParams will set the content-type for you, and allows you to _decode_ urlencoded data.