This is a node.js file that creates a Minecraft datapack that when used on a server or lan world will make it so that when a player tries to join they will not be able to due to the packet being too big.

crash_pack.js

const fs = require('fs');
const items = ["minecraft:acacia_boat","minecraft:acacia_button","minecraft:acacia_chest_boat","minecraft:acacia_door","minecraft:acacia_fence","minecraft:acacia_fence_gate","minecraft:acacia_leaves","minecraft:acacia_log","minecraft:acacia_planks","minecraft:acacia_pressure_plate","minecraft:acacia_sapling","minecraft:acacia_sign","minecraft:acacia_slab","minecraft:acacia_stairs","minecraft:acacia_trapdoor","minecraft:acacia_wood","minecraft:activator_rail","minecraft:air","minecraft:allay_spawn_egg","minecraft:allium","minecraft:amethyst_block","minecraft:amethyst_cluster","minecraft:amethyst_shard","minecraft:ancient_debris","minecraft:andesite","minecraft:andesite_slab","minecraft:andesite_stairs","minecraft:andesite_wall","minecraft:anvil","minecraft:apple","minecraft:armor_stand","minecraft:arrow","minecraft:axolotl_bucket","minecraft:axolotl_spawn_egg","minecraft:azalea","minecraft:azalea_leaves","minecraft:azure_bluet","minecraft:baked_potato","minecraft:bamboo","minecraft:barrel","minecraft:barrier","minecraft:basalt","minecraft:bat_spawn_egg","minecraft:beacon","minecraft:bedrock","minecraft:bee_nest","minecraft:bee_spawn_egg","minecraft:beef","minecraft:beehive","minecraft:beetroot","minecraft:beetroot_seeds","minecraft:beetroot_soup","minecraft:bell","minecraft:big_dripleaf","minecraft:birch_boat","minecraft:birch_button","minecraft:birch_chest_boat","minecraft:birch_door","minecraft:birch_fence","minecraft:birch_fence_gate","minecraft:birch_leaves","minecraft:birch_log","minecraft:birch_planks","minecraft:birch_pressure_plate","minecraft:birch_sapling","minecraft:birch_sign","minecraft:birch_slab","minecraft:birch_stairs","minecraft:birch_trapdoor","minecraft:birch_wood","minecraft:black_banner","minecraft:black_bed","minecraft:black_candle","minecraft:black_carpet","minecraft:black_concrete","minecraft:black_concrete_powder","minecraft:black_dye","minecraft:black_glazed_terracotta","minecraft:black_shulker_box","minecraft:black_stained_glass","minecraft:black_stained_glass_pane","minecraft:black_terracotta","minecraft:black_wool","minecraft:blackstone","minecraft:blackstone_slab","minecraft:blackstone_stairs","minecraft:blackstone_wall","minecraft:blast_furnace","minecraft:blaze_powder","minecraft:blaze_rod","minecraft:blaze_spawn_egg","minecraft:blue_banner","minecraft:blue_bed","minecraft:blue_candle","minecraft:blue_carpet","minecraft:blue_concrete","minecraft:blue_concrete_powder","minecraft:blue_dye","minecraft:blue_glazed_terracotta","minecraft:blue_ice","minecraft:blue_orchid","minecraft:blue_shulker_box","minecraft:blue_stained_glass","minecraft:blue_stained_glass_pane","minecraft:blue_terracotta","minecraft:blue_wool","minecraft:bone","minecraft:bone_block","minecraft:bone_meal","minecraft:book","minecraft:bookshelf","minecraft:bow","minecraft:bowl","minecraft:brain_coral","minecraft:brain_coral_block","minecraft:brain_coral_fan","minecraft:bread","minecraft:brewing_stand","minecraft:brick","minecraft:brick_slab","minecraft:brick_stairs","minecraft:brick_wall","minecraft:bricks","minecraft:brown_banner","minecraft:brown_bed","minecraft:brown_candle","minecraft:brown_carpet","minecraft:brown_concrete","minecraft:brown_concrete_powder","minecraft:brown_dye","minecraft:brown_glazed_terracotta","minecraft:brown_mushroom","minecraft:brown_mushroom_block","minecraft:brown_shulker_box","minecraft:brown_stained_glass","minecraft:brown_stained_glass_pane","minecraft:brown_terracotta","minecraft:brown_wool","minecraft:bubble_coral","minecraft:bubble_coral_block","minecraft:bubble_coral_fan","minecraft:bucket","minecraft:budding_amethyst","minecraft:bundle","minecraft:cactus","minecraft:cake","minecraft:calcite","minecraft:campfire","minecraft:candle","minecraft:carrot","minecraft:carrot_on_a_stick","minecraft:cartography_table","minecraft:carved_pumpkin","minecraft:cat_spawn_egg","minecraft:cauldron","minecraft:cave_spider_spawn_egg","minecraft:chain","minecraft:chain_command_block","minecraft:chainmail_boots","minecraft:chainmail_chestplate","minecraft:chainmail_helmet","minecraft:chainmail_leggings","minecraft:charcoal","minecraft:chest","minecraft:chest_minecart","minecraft:chicken","minecraft:chicken_spawn_egg","minecraft:chipped_anvil","minecraft:chiseled_deepslate","minecraft:chiseled_nether_bricks","minecraft:chiseled_polished_blackstone","minecraft:chiseled_quartz_block","minecraft:chiseled_red_sandstone","minecraft:chiseled_sandstone","minecraft:chiseled_stone_bricks","minecraft:chorus_flower","minecraft:chorus_fruit","minecraft:chorus_plant","minecraft:clay","minecraft:clay_ball","minecraft:clock","minecraft:coal","minecraft:coal_block","minecraft:coal_ore","minecraft:coarse_dirt","minecraft:cobbled_deepslate","minecraft:cobbled_deepslate_slab","minecraft:cobbled_deepslate_stairs","minecraft:cobbled_deepslate_wall","minecraft:cobblestone","minecraft:cobblestone_slab","minecraft:cobblestone_stairs","minecraft:cobblestone_wall","minecraft:cobweb","minecraft:cocoa_beans","minecraft:cod","minecraft:cod_bucket","minecraft:cod_spawn_egg","minecraft:command_block","minecraft:command_block_minecart","minecraft:comparator","minecraft:compass","minecraft:composter","minecraft:conduit","minecraft:cooked_beef","minecraft:cooked_chicken","minecraft:cooked_cod","minecraft:cooked_mutton","minecraft:cooked_porkchop","minecraft:cooked_rabbit","minecraft:cooked_salmon","minecraft:cookie","minecraft:copper_block","minecraft:copper_ingot","minecraft:copper_ore","minecraft:cornflower","minecraft:cow_spawn_egg","minecraft:cracked_deepslate_bricks","minecraft:cracked_deepslate_tiles","minecraft:cracked_nether_bricks","minecraft:cracked_polished_blackstone_bricks","minecraft:cracked_stone_bricks","minecraft:crafting_table","minecraft:creeper_banner_pattern","minecraft:creeper_head","minecraft:creeper_spawn_egg","minecraft:crimson_button","minecraft:crimson_door","minecraft:crimson_fence","minecraft:crimson_fence_gate","minecraft:crimson_fungus","minecraft:crimson_hyphae","minecraft:crimson_nylium","minecraft:crimson_planks","minecraft:crimson_pressure_plate","minecraft:crimson_roots","minecraft:crimson_sign","minecraft:crimson_slab","minecraft:crimson_stairs","minecraft:crimson_stem","minecraft:crimson_trapdoor","minecraft:crossbow","minecraft:crying_obsidian","minecraft:cut_copper","minecraft:cut_copper_slab","minecraft:cut_copper_stairs","minecraft:cut_red_sandstone","minecraft:cut_red_sandstone_slab","minecraft:cut_sandstone","minecraft:cut_sandstone_slab","minecraft:cyan_banner","minecraft:cyan_bed","minecraft:cyan_candle","minecraft:cyan_carpet","minecraft:cyan_concrete","minecraft:cyan_concrete_powder","minecraft:cyan_dye","minecraft:cyan_glazed_terracotta","minecraft:cyan_shulker_box","minecraft:cyan_stained_glass","minecraft:cyan_stained_glass_pane","minecraft:cyan_terracotta","minecraft:cyan_wool","minecraft:damaged_anvil","minecraft:dandelion","minecraft:dark_oak_boat","minecraft:dark_oak_button","minecraft:dark_oak_chest_boat","minecraft:dark_oak_door","minecraft:dark_oak_fence","minecraft:dark_oak_fence_gate","minecraft:dark_oak_leaves","minecraft:dark_oak_log","minecraft:dark_oak_planks","minecraft:dark_oak_pressure_plate","minecraft:dark_oak_sapling","minecraft:dark_oak_sign","minecraft:dark_oak_slab","minecraft:dark_oak_stairs","minecraft:dark_oak_trapdoor","minecraft:dark_oak_wood","minecraft:dark_prismarine","minecraft:dark_prismarine_slab","minecraft:dark_prismarine_stairs","minecraft:daylight_detector","minecraft:dead_brain_coral","minecraft:dead_brain_coral_block","minecraft:dead_brain_coral_fan","minecraft:dead_bubble_coral","minecraft:dead_bubble_coral_block","minecraft:dead_bubble_coral_fan","minecraft:dead_bush","minecraft:dead_fire_coral","minecraft:dead_fire_coral_block","minecraft:dead_fire_coral_fan","minecraft:dead_horn_coral","minecraft:dead_horn_coral_block","minecraft:dead_horn_coral_fan","minecraft:dead_tube_coral","minecraft:dead_tube_coral_block","minecraft:dead_tube_coral_fan","minecraft:debug_stick","minecraft:deepslate","minecraft:deepslate_brick_slab","minecraft:deepslate_brick_stairs","minecraft:deepslate_brick_wall","minecraft:deepslate_bricks","minecraft:deepslate_coal_ore","minecraft:deepslate_copper_ore","minecraft:deepslate_diamond_ore","minecraft:deepslate_emerald_ore","minecraft:deepslate_gold_ore","minecraft:deepslate_iron_ore","minecraft:deepslate_lapis_ore","minecraft:deepslate_redstone_ore","minecraft:deepslate_tile_slab","minecraft:deepslate_tile_stairs","minecraft:deepslate_tile_wall","minecraft:deepslate_tiles","minecraft:detector_rail","minecraft:diamond","minecraft:diamond_axe","minecraft:diamond_block","minecraft:diamond_boots","minecraft:diamond_chestplate","minecraft:diamond_helmet","minecraft:diamond_hoe","minecraft:diamond_horse_armor","minecraft:diamond_leggings","minecraft:diamond_ore","minecraft:diamond_pickaxe","minecraft:diamond_shovel","minecraft:diamond_sword","minecraft:diorite","minecraft:diorite_slab","minecraft:diorite_stairs","minecraft:diorite_wall","minecraft:dirt","minecraft:dirt_path","minecraft:disc_fragment_5","minecraft:dispenser","minecraft:dolphin_spawn_egg","minecraft:donkey_spawn_egg","minecraft:dragon_breath","minecraft:dragon_egg","minecraft:dragon_head","minecraft:dried_kelp","minecraft:dried_kelp_block","minecraft:dripstone_block","minecraft:dropper","minecraft:drowned_spawn_egg","minecraft:echo_shard","minecraft:egg","minecraft:elder_guardian_spawn_egg","minecraft:elytra","minecraft:emerald","minecraft:emerald_block","minecraft:emerald_ore","minecraft:enchanted_book","minecraft:enchanted_golden_apple","minecraft:enchanting_table","minecraft:end_crystal","minecraft:end_portal_frame","minecraft:end_rod","minecraft:end_stone","minecraft:end_stone_brick_slab","minecraft:end_stone_brick_stairs","minecraft:end_stone_brick_wall","minecraft:end_stone_bricks","minecraft:ender_chest","minecraft:ender_eye","minecraft:ender_pearl","minecraft:enderman_spawn_egg","minecraft:endermite_spawn_egg","minecraft:evoker_spawn_egg","minecraft:experience_bottl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const maxPacketSize = 8388608; // 8MB
const ingredientSize = items.length * 4;
// 4 bytes per ingredient at min can be bigger if has nbt or count. there is also the array list length varint but its insignificant here.
// the amount of bytes also changes depending on the item as the item id is a varint.
// Also changes when it comes to items like tools because they have nbt by default which makes this a lot bigger.
const baseShapelessSize =
    (1 + 28 /* Recipe Type Id */) +
    (1 + 14 /* Recipe Id */) +
    (1 + 5 /* Group */) +
    (1 /* Ingredients length */) +
    (ingredientSize * 9 /* Ingredients */) +
    (4 /* Result if only 1 count and no nbt */);
const recipeCount = Math.ceil(maxPacketSize / baseShapelessSize);

fs.mkdirSync('./crash_pack/data/crash/tags/items/', { recursive: true }, (err) => { if (err) return console.error(err); });
fs.rmSync('./crash_pack/data/crash/recipes/', { recursive: true, force: true });
fs.mkdirSync('./crash_pack/data/crash/recipes/', { recursive: true }, (err) => { if (err) return console.error(err); });

fs.writeFile(
    "./crash_pack/pack.mcmeta",
    JSON.stringify({
        "pack": {
            "description": "Crash with a a few recipes with big tags.",
            "pack_format": 10
        }
    }, null, 0),
    (err) => {
        if (err) {
            return console.error(err);
        }
    }
);

fs.writeFile(
    "./crash_pack/data/crash/tags/items/all_items.json",
    JSON.stringify({
        "replace": false,
        "values": items
    }, null, 0),
    (err) => {
        if (err) {
            return console.error(err);
        }
    }
);

//Around the number needed to exceed the max number of recipes that will make the ingredients arrays size exceed the max packet size.
for (let i = 0; i < recipeCount; i++) {
    const recipe = {
        "type": "minecraft:crafting_shapeless",
        "group": "crash",
        "ingredients": [
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"},
            {"tag": "crash:all_items"}
        ],
        "result": {"item": items[i]}
    }

    fs.writeFile(
        `./crash_pack/data/crash/recipes/bad_recipe_${i}.json`,
        JSON.stringify(recipe, null, 0),
        (err) => {
            if (err) {
                return console.error(err);
            }
        }
    );
}

console.log("Happy Crashing!")
console.log(`Recipe Count: ${recipeCount}`)