Nice to PATCH mentioned. Highly useful and often overlooked.
On an old project our backend team agreed to support PATCH, but they wanted it based on this RFC: https://tools.ietf.org/html/rfc6902
The front end team wanted something more like this (before it was ensconced in an RFC): https://tools.ietf.org/html/rfc7386
To me, RFC7386 more accurately represents the idea of just sending the updated content.