This web application prepares an NFC tag by writing a URL to it. You can configure which URL to write to the tag by setting the ?url= query parameter in the URL of the page.
Note
Currently, only Android Chrome is supported. See https://caniuse.com/webnfc.
Construct a URL like this:
https://creatorsgarten.github.io/nfc-onboarder/?url=https://grtn.org/inventory/nfc/{sn}
Replace https://grtn.org/inventory/nfc_{sn} with the URL you want to write to the NFC tag. The {sn} part will be replaced with the serial number of the NFC tag. Note that the serial number will not have : characters in it.