Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Suggestions or found a bug
Leave me a comment/like on:Minecraft Give or Summon Firework Rocket Generator
Create a custom firework rocket, give firework rock generator and summon custom firework rocket, select color and explosion shape.
Flight Duration: How long the fire work will fly for. Between -1 to 3 work best, other options tend not to explode.
Life Time: Optional summon option, sets the time for how long until firework explodes, set to 0 for instant explosion.
Summon: The give options are present on summon command, but have no effect. For summon it's best to just use the options on the Firework Tab.
Set LifeTime for instant explosion.
/summon firework_rocket ~ ~ ~ {LifeTime:0,FireworksItem:{id:firework_rocket,Count:1,tag:{Fireworks:{Explosions:[{Colors:[I;14602026]}]}}}}
Adjust coordinates for explosion.
/summon firework_rocket ~2 ~5 ~2 {LifeTime:0,FireworksItem:{id:firework_rocket,Count:1,tag:{Fireworks:{Explosions:[{Colors:[I;14602026]}]}}}}
ShotAtAngle: Not implemented yet, due to the need to add proper entity summon support in this tool. Maybe let me know on reddit you want it.
Minecraft Versions Permalinks
If you find yourself using a particular version all the time, you can link directly. There is some crossover between versions, so there will be quirks.