Save and Load Form state to and from the URL

API

formToUrl(form: HTMLFormElement): void

Serialize form data to a search params string and push it to the URL without reloading the page (using the history API)

urlToForm(form: HTMLFormElement): void

Parse the search params and set form values

urlToClipboard({ searchOnly?: boolean }): Promise<void>

Write current url to clipboard

searchOnly: When set to true, copy only the search parmas part of the url

Demo

https://tombigel.github.io/form-to-url-to-form/

Forms are a great way to manage state for UI, their data is serializable and is fairly easy to deserialize it back to the form.
We can push the entire form state to the url and create a savable state with very little code and no framework dependency.
This demo shows a way to do it using FormData, URLSearchParams, form.requestSubmit() and history.pushState.

The only external dependency is a polyfill for form.requestSubmit().
Safari's implementation is behind a flag for about a year now and there is no info on if and when it will be open by default (https://bugs.webkit.org/show_bug.cgi?id=197958).