The recipes shipped with WebDisplays REMASTER 2.0.0 are broken on 1.21.1. They still use the old 1.12-era Forge format ("data": N fields, "item": instead of "id": in results, and the recipes/ folder instead of recipe/), so the game silently rejects every single one of them at load time.
This datapack republishes all 21 recipes in the proper 1.21.1 format, using the same patterns and ingredients the mod was supposed to ship. Nothing rebalanced, nothing made up. Recipes included
backlight, batcell, batpack, extcard, keyboard, laserdiode, laserpointer, linker, minepad, peripheral, rctrl, redctrl, screen, screencfg, server, stonekey, upgrade, upgrade_gps, upgrade_laser, upgrade_redin, upgrade_redout What's NOT included
minepad2 and redctrl2, those were item-metadata variants (a 1.12 thing). Item metadata doesn't exist in 1.21 anymore, so unless the mod exposes those as separate item IDs, a vanilla shaped recipe can't reproduce them. Installation
Drop the .zip into world/datapacks/ (or datapacks/ at the server root on NeoForge), then /reload or restart. JEI/EMI/REI will pick up the recipes right after. Versions
Minecraft 1.21.1 / NeoForge, tested with WebDisplays REMASTER 2.0.0.

A datapack that adds crafts to the “WebDisplays REMASTER” mod, which is a bit poorly made