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Java Edition:Long Name Item

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To do: Add downgrade version range; link to discord discussion

By updating a custom named item through certain versions will add additional characters, which can make the name longer than usually possible[1]. You can also give items a longer name than possible by downgrading the custom named item.

Obtaining

Upgrading

Update.png
Warning: Upgrading 
This feature requires the use of upgrading and requires specific version paths. Follow the page instructions carefully.

Obtaining this is very simple by updating your world.

  1. First, get a custom named item from 12w41a (1.4.2 snapshot) through 17w50a (1.13 snapshot).
  2. Store the item in a regular chest. This does not work if the item is in your inventory or an ender chest.
  3. Directly update this item to (or stored in unloaded chunks until) 18w21b/18w22a.

This adds additional characters to the custom name.

Note: This also works with translatable items, such as woodland mansion explorer maps and ocean monument explorer maps. In addition, you can get long names for all renamed mobs in the game except for the ender dragon. This is also possible in current versions by giving a Name Tag a long name.

Downgrading

Downgrade2.png
Warning: Downgrading 
This feature requires the use of downgrading which can result in crashes, data loss, or corruption, and requires specific versions. Follow the page instructions carefully.

If you downgrade to before 17w50a[2] and upgrade back to 18w21b/18w22a, the name will increase again. With this method, the player can obtain an item with a name length of 65,524. Going beyond this limit will cause errors while saving the string to NBT. The growth is exponential due to the automatic addition of 4 double quotes with every trip to 18w21b/18w22a. For an unknown reason, when the player has the item in their inventory, the name gets longer when the player downgrades back to 17w50a.

Caution! - As the item's name increases, the game starts lagging more and more when the item's tool tip is rendered.

The maximum number of characters after a number of downgrades (needs updating, using / is faster than using &)
  • 0 - 221
  • 1 - 310
  • 2 - 485
  • 3 - 832
  • 4 - 1,523
  • 5 - 2,902
  • 6 - 5,657
  • 7 - 11,164
  • 8 - 22,175
  • 9 - 44,194
  • 10 - 88,229
  • 11 - 176,296
  • 12 - 352,427
  • 13 - 704,686
  • 14 - 1,409,201
  • 15 - 2,818,228

Formula for Calculation of Name Length

L=(B+4)2D+C(2∣D−1∣+3(D−1−∣D−1∣)+5)+A+7D−4
A = Number of Normal Characters
B = Number of Backslashes/Quotation Marks
C = Number of (</>/'/=/&)
D = Number of Downgrades/Updates to 18w21b/18w22a

Characters

Different characters convert to different characters upon updating.

All custom named items have {"text":"" added to the beginning of the name, and ""} added to the end of the name. This causes all custom named items to look like this: {"text":"<previous name>"}.

Using this method alone, along with previously naming the item with all 35 characters allows for a custom name of 46 characters. This is 11 more than the maximum.

Other specific characters affected are below. The best possible combination of characters would be 35 of any of these characters <>='& which would result in a total of 221 characters.

  • A backslash \ becomes \\.
  • A double quote " becomes \".
  • A greater than symbol > becomes \u003e.
  • A less than symbol < becomes \u003c.
  • An equal sign symbol = becomes \u003d.
  • An and symbol & becomes \u0026.
  • A single quote ' becomes \u0027.

Uses

Long Name Mob

Main page: Long Name Mob

By updating a mob through the same version ranges as the item or getting a Name Tag with a long name, you can create Long Name Mobs.

Invalid Name Explorer Map Trade

Main page: Invalid Name Explorer Map Trade

By updating a Cartographer villager with the Explorer map trades though the same versions as getting a long name item, the maps gain extra characters, allowing for a Cartographer with an Invalid Name Explorer Map Trade. Woodland mansion maps convert to {"translate":"filled_map.mansion"} and ocean explorer maps convert to {"translate":"filled_map.monument"}.

See also

References

  1. ↑ MC-130397. bugs.mojang.com.
  2. ↑ Downgrading from 18w21b to 17w50a doesn't seem to work so you'll need to go through another version first
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