Resource Location

String representing the registry name of an object in the game. Format is always <domain>:<name>, where <domain> typically represents a mod or datapack ID, and <name> is the specific name for this object. Valid characters are any lowercase letter, any number, -, _, and /. A single : is allowed between the domain and name.

Note that when creating new content, it is always advised to use a custom domain for your content over that of an existing mod such as tconstruct to minimize potential for conflict and to properly show the user the source of the content.

Registry IDs

A common application of resource locations is an ID of a value in a registry. Unlike regular resource locations, registry IDs are often validated against the registry contents to ensure a matching ID exists.

Tag Name

See also the Minecraft Wiki article on tags

Another common application of resource locations is an ID of a tag for a registry. Tags typically exist under data/<domain>/tags/<registry name>/<name>.json, though material and modifier tags exist under data/<domain>/tinkering/tags/<materials|modifiers>/<name>.json.

For JSON tag fields, if the requested tag does not exist the behavior is the same as if the tag is empty.

Color

Many JSON contain colors expressed as 6 or 8 digit hex color strings. 6 digit RGB strings use the format of "RRGGBB", while 8 digit ARGB strings use the format of "AARRGGBB". AA, RR, GG, and BB are hex numbers between 0 (00) and 255 (FF) representing the intensity of the color in (case insensitive) hexadecimal, with higher values meaning more of that color is present. On ARGB strings, if only 6 digits are provided then AA is set to 255.

For example, "FF00000" represents a bright red, as RR is 255 and both GG and BB are 0. If this was an ARGB color, then AA would be set to 255 (fully opaque).