Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Effect Command Maker Tool
Make commands to give players effects such as hunger and darkness, with easy target selector. For both Minecraft Java and Bedrock. There is a different command syntax for both versions, so make sure you choose the version applicable to you. Java and bedrock also have some different effects not available in the other.
Select the effect can harm or help a player. Seconds will set how long the effect will last for. Amplifier will increase the effect on the player, for example the greater the Jump boost amplifier the higher the player will jump. Hide particles will prevent particles appearing around the player whilst the effect in active.
The clear effect command is also selectable. As with the give effect command there is a different syntax between Java and Bedrock. Java supports clearing individual effects, where as Bedrock only supports clear all.
Version History
addedUpdated page content command with version toggle
added1.21 particles
patch1.21 particles syntax issues on particles with extra options
patchCommand save to storage issues
addedAllow attributes ids to be set for 1.21, name for before 1.21
addedNew attributes and removed uuid for 1.21
patch1.20.5+ give summon item name and lore
patch1.20.5+ tag to custom_data
patchCaching changes for icons
addedCache busting for updates
addedGive fake enchantment, potential fix
patchAttributes not importing correctly
patchIn some cases the enchantment tab disappears
added1.21 is now default
patch1.21 attributes name changed to id.
patchText editor single quote and escape character handling
added1.21 items
addedSome 1.20.5 particle support
patch1.20.5 Container item component nbt
patchText/Lore importing
added1.20.5 finished adding summon potion, firework, item, falling block, and block display support
patch1.20.5 fixed sweeping which had been renamed to sweeping_edge
added1.20.5 import for banners, enchanted books, fireworks, goat horns, knowledge books, player heads, potions, signs, and written books
added1.20.5 import for base command, and armor
added1.20.5 support for banners and premade banners
patch1.20.5 potion Ambient, Particles, Icon
added1.20.5 support for summon item
added1.20.5 support for signs
patchplayer head texture urls not working
added1.20.5 support for Enchanted Books, Fireworks, Player Heads
added1.20.5 support for Potions, Written Books
patchTargets not updating when updated
added1.20.5 support for Armor, Knowledge Books
patchItem search
addedGive generator migrated to version 2
addedBanner generator migrated to version 2
added1.20.5 predicates, sbt
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(44 More Updates)