Unreal's Property Specifiers page lists all of the core specifiers and many of the metadata specifiers, but it is not an exhaustive list.

This page attempts to be an exhaustive list of all the UPROPERTY specifiers, giving explanations, sample code, screenshots and related links for each.

If you know of any not listed here, or see any mistakes, feel free to contact me.

Special thanks to Erekose Craft, Ben Fox, Aquanox, ATankNoMore for finding meta properties, giving feedback and giving great examples of usage.

The YAML files used to generate this documentation are available on GitHub. Feel free to submit pull requests or submit any incorrect or missing information there.

General Points

• Tags are case insensitive, but I would recommend sticking to the case example here for readability.
• Quotation marks are optional if the values does not have spaces. e.g. someBool=true is treated the same as someBool="true". Again, for readability I would recommend using quotation marks only around string-type properties.