hi bro,first thk for your job ;D
for me it
1:works correctly with resources and medical (except low grade stack is sized at 2k max,crude oil at 1k and medikit are at 10 instead of 5)
2:doesn't work correctly with ammo,food and component(stack are sized to 50 for food,component what ever value i set,except for pumpkins it keeps the default value 20 and ammo stack are sized at max 200)
3:it doesn't work at all with weapon,construction,attire,tool,traps and misc.

this is my .json

{
"Settings": {
"CategoryDefaultStack": {
"Ammunition": 256,
"Attire": 5,
"Common": 30,
"Component": 30,
"Construction": 30,
"Food": 25,
"Items": 5,
"Medical": 5,
"Misc": 5,
"Resources": 50000,
"Tools": 5,
"Traps": 5,
"Weapon": 0
},
"DefaultStack": 0,
"StackHealthItems": true
}
}

Thank you for replying, however this is the same format I have just with different numbers. No resources or other items will stack above their standard amount. I've tried both in RCON, CFG files and chat. Nothing seems to work for me. 

Well guys it works for me with no problems, When the plugin updated and i saw that the main size config would be in the data file I just copy/pasted my original "config" into the data file, I changed the "new" config file to what i wanted , when i checked the data file i noticed that some items were stacked larger or smaller ( because what "group" they were in)  than i wanted and changed them one by one to what i wanted,
This update is great as i can now stack electrical and diving as well as weapons and tools,
I have my resources stacking at 600000, medkits at 50, weapons at 5, I dont bother using chat or rcon to update the files it is much easier (because of the amount of items) to copy the data file into a new text document, take my time editing it , check it with json validator and then copy paste it back into the data folder,
I do this also because my Streamline dashboard will close down after about 5 minutes which is bad if you are editing a large file,  :)

Can you check the data file for the value of the items that supposedly do not work? 

Keep in mind that if you damage tools/weapons/etc, you cannot stack them again. 

Doesn't seem to be a data file for stack size. Maybe you can link one so I can upload it. I am using GameServerKings so its a bit different. I assure you I am looking in the correct folder, oxide/data.

Here is mine , edit it to what you want,

{
  "itemlist": {
    "8x Zoom Scope": 5,
    "Assault Rifle": 5,
    "Handmade Shell": 1000,
    "Pistol Bullet": 1000,
    "Incendiary Pistol Bullet": 1000,
    "HV Pistol Ammo": 1000,
    "5.56 Rifle Ammo": 1000,
    "Explosive 5.56 Rifle Ammo": 1000,
    "Incendiary 5.56 Rifle Ammo": 1000,
    "HV 5.56 Rifle Ammo": 1000,
    "Rocket": 100,
    "Incendiary Rocket": 100,
    "High Velocity Rocket": 100,
    "Smoke Rocket WIP!!!!": 100,
    "12 Gauge Buckshot": 1000,
    "12 Gauge Incendiary Shell": 1000,
    "12 Gauge Slug": 1000,
    "AND Switch": 15,
    "Anti-Radiation Pills": 1000,
    "Apple": 1000,
    "Rotten Apple": 1000,
    "Bone Arrow": 100,
    "Fire Arrow": 100,
    "High Velocity Arrow": 100,
    "Wooden Arrow": 100,
    "Audio Alarm": 15,
    "Auto Turret": 500,
    "Salvaged Axe": 5,
    "Bandage": 50,
    "A Barrel Costume": 5,
    "Concrete Barricade": 20,
    "Metal Barricade": 20,
    "Sandbag Barricade": 20,
    "Stone Barricade": 20,
    "Wooden Barricade": 20,
    "Barbed Wooden Barricade": 20,
    "Battery - Small": 20,
    "Barbeque": 10,
    "Snap Trap": 50,
    "Bed": 10,
    "Binoculars": 5,
    "Black Raspberries": 1000,
    "Bleach": 50,
    "Blood": 50,
    "Blueberries": 1000,
    "Blueprint": 5,
    "Bolt Action Rifle": 5,
    "Bone Club": 5,
    "Bone Fragments": 2000,
    "Bota Bag": 10,
    "Hunting Bow": 5,
    "Large Wood Box": 100,
    "Wood Storage Box": 100,
    "Water Bucket": 5,
    "Building Plan": 20,
    "Burlap Shirt": 5,
    "Burlap Shoes": 5,
    "Butcher Knife": 5,
    "Cable Tunnel": 15,
    "Cactus Flesh": 1000,
    "Birthday Cake": 5,
    "Camera": 15,
    "Camp Fire": 100,
    "Can of Beans": 100,
    "Empty Can Of Beans": 200,
    "Can of Tuna": 100,
    "Empty Tuna Can": 100,
    "Candy Cane Club": 5,
    "Candy Cane": 100,
    "Cursed Cauldron": 5,
    "CCTV Camera": 2000,
    "Ceiling Light": 100,
    "Chainsaw": 5,
    "Chair": 10,
    "Charcoal": 600000,
    "Burnt Chicken": 100,
    "Cooked Chicken": 1000,
    "Raw Chicken Breast": 1000,
    "Spoiled Chicken": 100,
    "Chinese Lantern": 10,
    "Chocolate Bar": 100,
    "Christmas Door Wreath": 100,
    "Cloth": 2000,
    "Coal :(": 200000,
    "Coffin": 5,
    "Compound Bow": 5,
    "Corn": 1000,
    "Corn Clone": 100,
    "Corn Seed": 100,
    "Counter": 15,
    "Crossbow": 5,
    "Crude Oil": 200000,
    "Tool Cupboard": 20,
    "RF Transmitter": 15,
    "Diving Fins": 15,
    "Diving Mask": 15,
    "Diving Tank": 15,
    "Wetsuit": 15,
    "Sheet Metal Double Door": 20,
    "Armored Double Door": 20,
    "Wood Double Door": 20,
    "Sheet Metal Door": 20,
    "Armored Door": 20,
    "Wooden Door": 20,
    "Door Key": 5,
    "Door Closer": 20,
    "Door Controller": 15,
    "Festive Doorway Garland": 100,
    "Dragon Door Knocker": 100,
    "Drop Box": 100,
    "Duct Tape": 500,
    "Flasher Light": 15,
    "Siren Light": 15,
    "Blocker": 15,
    "Electrical Branch": 15,
    "Root Combiner": 15,
    "Memory Cell": 15,
    "RAND Switch": 15,
    "Satchel Charge": 50,
    "Timed Explosive Charge": 50,
    "Explosives": 2000,
    "m-facialhair01": 5,
    "Animal Fat": 200000,
    "f-armpit01": 5,
    "f-eyebrow01": 5,
    "f-pubic01": 5,
    "f-hairstyle-1": 5,
    "f-hairstyle-3": 5,
    "f-hairstyle-5": 5,
    "Stone Fireplace": 10,
    "Cooked Fish": 1000,
    "Raw Fish": 1000,
    "Handmade Fishing Rod": 5,
    "Flame Thrower": 5,
    "Flame Turret": 50,
    "Flare": 5,
    "Flashlight": 5,
    "Weapon flashlight": 5,
    "Floor grill": 20,
    "Ladder Hatch": 20,
    "Fogger-3000": 5,
    "Fridge": 100,
    "Frog Boots": 5,
    "Low Grade Fuel": 600000,
    "Furnace": 100,
    "Large Furnace": 100,
    "Electric Fuse": 15,
    "High External Stone Gate": 20,
    "High External Wooden Gate": 20,
    "Gears": 500,
    "Geiger Counter": 15,
    "Small Generator": 15,
    "Wind Turbine": 10,
    "Giant Candy Decor": 5,
    "Giant Lollipop Decor": 5,
    "Burlap Gloves": 5,
    "Leather Gloves": 5,
    "Roadsign Gloves": 5,
    "Tactical Gloves": 5,
    "Glowing Eyes": 5,
    "Glue": 500,
    "Granola Bar": 100,
    "Gravestone": 5,
    "Wooden Cross": 5,
    "Graveyard Fence": 5,
    "Beancan Grenade": 50,
    "F1 Grenade": 50,
    "Acoustic Guitar": 5,
    "Gun Powder": 600000,
    "Hab Repair": 5,
    "m-hairstyle-1": 5,
    "f-hairstyle-2": 5,
    "Halloween Loot Bag": 5,
    "WIP": 5,
    "Scarecrow Wrap": 5,
    "Hide Halterneck": 5,
    "Hammer": 5,
    "Salvaged Hammer": 5,
    "Beenie Hat": 5,
    "Boonie Hat": 5,
    "Bucket Helmet": 5,
    "Burlap Headwrap": 5,
    "Candle Hat": 5,
    "Baseball Cap": 5,
    "Clatter Helmet": 5,
    "Coffee Can Helmet": 5,
    "Bone Helmet": 5,
    "Dragon Mask": 5,
    "Heavy Plate Helmet": 5,
    "Miners Hat": 5,
    "Party Hat": 5,
    "Reindeer Antlers": 5,
    "Riot Helmet": 5,
    "Wolf Headdress": 5,
    "Wood Armor Helmet": 5,
    "Hatchet": 5,
    "Hazmat Suit": 50,
    "HBHF Sensor": 15,
    "Hemp Clone": 100,
    "Hemp Seed": 100,
    "Hide Boots": 5,
    "Hide Skirt": 5,
    "Hide Vest": 5,
    "Holosight": 50,
    "Hoodie": 5,
    "High Quality Metal Ore": 600000,
    "Burnt Human Meat": 100,
    "Cooked Human Meat": 100,
    "Raw Human Meat": 100,
    "Spoiled Human Meat": 100,
    "Salvaged Icepick": 5,
    "Bone Armor": 5,
    "Heavy Plate Jacket": 5,
    "Snow Jacket": 5,
    "Jacket": 5,
    "Jackhammer": 5,
    "Jack O Lantern Angry": 100,
    "Jack O Lantern Happy": 100,
    "Blue Keycard": 50,
    "Green Keycard": 50,
    "Red Keycard": 50,
    "Bone Knife": 5,
    "L96 Rifle": 5,
    "Wooden Ladder": 20,
    "Land Mine": 50,
    "Lantern": 100,
    "Large Rechargable Battery": 15,
    "Large Candle Set": 5,
    "Large Medkit": 50,
    "Laser Detector": 15,
    "Weapon Lasersight": 50,
    "Leather": 20000,
    "Code Lock": 20,
    "Key Lock": 20,
    "Locker": 100,
    "Longsword": 5,
    "LR-300 Assault Rifle": 5,
    "M249": 5,
    "M39 Rifle": 5,
    "M92 Pistol": 5,
    "Mace": 5,
    "Machete": 5,
    "Mail Box": 100,
    "m-facialhair02": 5,
    "m-facialhair03": 5,
    "m-facialhair04": 5,
    "m-hairstyle-2": 5,
    "m-hairstyle-4": 5,
    "m-armpit01": 5,
    "m-eyebrow01": 5,
    "m-pubic01": 5,
    "m-hairstyle-3": 5,
    "m-hairstyle-5": 5,
    "Paper Map": 10,
    "Improvised Balaclava": 5,
    "Bandana Mask": 5,
    "Metal Facemask": 5,
    "Burnt Bear Meat": 1000,
    "Cooked Bear Meat": 1000,
    "Raw Bear Meat": 1000,
    "Burnt Deer Meat": 1000,
    "Cooked Deer Meat": 1000,
    "Raw Deer Meat": 1000,
    "Burnt Horse Meat": 1000,
    "Cooked Horse Meat": 1000,
    "Raw Horse Meat": 1000,
    "Burnt Pork": 1000,
    "Cooked Pork": 1000,
    "Raw Pork": 1000,
    "Burnt Wolf Meat": 1000,
    "Cooked Wolf Meat": 1000,
    "Raw Wolf Meat": 1000,
    "Spoiled Wolf Meat": 1000,
    "Metal Fragments": 600000,
    "Metal Ore": 600000,
    "Metal Chest Plate": 5,
    "High Quality Metal": 600000,
    "Metal Blade": 500,
    "Metal Pipe": 500,
    "MC repair": 15,
    "Pump Jack": 20,
    "Mining Quarry": 20,
    "Minnows": 1000,
    "MP5A4": 5,
    "Mushroom": 1000,
    "Muzzle Boost": 5,
    "Muzzle Brake": 5,
    "Nailgun": 5,
    "Nailgun Nails": 1000,
    "Note": 5,
    "OR Switch": 15,
    "Burlap Trousers": 5,
    "Pants": 5,
    "Heavy Plate Pants": 5,
    "Hide Pants": 5,
    "Road Sign Kilt": 5,
    "Shorts": 5,
    "Paper": 2000,
    "Pickaxe": 5,
    "Pickles": 100,
    "Eoka Pistol": 5,
    "Revolver": 5,
    "Semi-Automatic Pistol": 5,
    "Pitchfork": 5,
    "Large Planter Box": 100,
    "Small Planter Box": 100,
    "Hide Poncho": 5,
    "Pookie Bear": 100,
    "Large Present": 5,
    "Medium Present": 5,
    "Small Present": 5,
    "Pressure Pad": 15,
    "Empty Propane Tank": 50,
    "Pumpkin": 1000,
    "Pumpkin Plant Clone": 100,
    "Pumpkin Seed": 100,
    "Python Revolver": 5,
    "Reactive Target": 100,
    "Repair Bench": 10,
    "Research Table": 10,
    "Research Paper": 200,
    "RF Broadcaster": 15,
    "RF Pager": 15,
    "RF Receiver": 15,
    "Rifle Body": 5,
    "Road Sign Jacket": 5,
    "Road Signs": 5,
    "Rock": 5,
    "Rocket Launcher": 5,
    "Rope": 5000,
    "Rug Bear Skin": 100,
    "Rug": 100,
    "Salt Water": 2000000,
    "Salvaged Cleaver": 5,
    "Salvaged Sword": 5,
    "SAM Ammo": 1000,
    "SAM Site": 5,
    "Santa Hat": 5,
    "Scarecrow": 100,
    "Scientist Suit": 10,
    "4x Zoom Scope": 5,
    "Scrap": 600000,
    "Search Light": 100,
    "Semi-Automatic Rifle": 5,
    "Semi Automatic Body": 5,
    "Sewing Kit": 50,
    "Sheet Metal": 500,
    "Salvaged Shelves": 100,
    "Shirt": 5,
    "Tank Top": 5,
    "Boots": 5,
    "Double Barrel Shotgun": 5,
    "Pump Shotgun": 5,
    "Waterpipe Shotgun": 5,
    "Shotgun Trap": 5,
    "Metal horizontal embrasure": 20,
    "Metal Vertical embrasure": 20,
    "Wood Shutters": 20,
    "Sickle": 5,
    "Large Banner Hanging": 10,
    "Two Sided Hanging Sign": 10,
    "Two Sided Ornate Hanging Sign": 10,
    "Landscape Picture Frame": 10,
    "Portrait Picture Frame": 10,
    "Tall Picture Frame": 10,
    "XL Picture Frame": 10,
    "XXL Picture Frame": 10,
    "Large Banner on pole": 10,
    "Double Sign Post": 10,
    "Single Sign Post": 10,
    "One Sided Town Sign Post": 10,
    "Two Sided Town Sign Post": 10,
    "Huge Wooden Sign": 10,
    "Large Wooden Sign": 10,
    "Wooden Sign": 10,
    "Small Wooden Sign": 10,
    "Silencer": 5,
    "Simple Light": 5,
    "Simple Handmade Sight": 5,
    "Skull Fire Pit": 100,
    "Human Skull": 200,
    "Wolf Skull": 200,
    "Sleeping Bag": 100,
    "Small Rechargable Battery": 15,
    "Small Oil Refinery": 10,
    "Small Stash": 10,
    "Small Candle Set": 5,
    "Small Trout": 100,
    "Small Water Bottle": 10,
    "Custom SMG": 5,
    "SMG Body": 5,
    "Smoke Grenade": 50,
    "Snowball": 5,
    "Snow Machine": 5,
    "Snowman": 10,
    "Large Solar Panel": 15,
    "Spas-12 Shotgun": 5,
    "Stone Spear": 5,
    "Wooden Spear": 5,
    "Spider Webs": 5,
    "Wooden Floor Spikes": 500,
    "Spinning wheel": 100,
    "Splitter": 15,
    "Spooky Speaker": 15,
    "Metal Spring": 500,
    "Sticks": 500,
    "SUPER Stocking": 100,
    "Small Stocking": 100,
    "Stone Pickaxe": 5,
    "Stone Hatchet": 5,
    "Stones": 600000,
    "Strobe Light": 50,
    "Sulfur": 600000,
    "Sulfur Ore": 600000,
    "Supply Signal": 100,
    "Survey Charge": 50,
    "Survival Fish Trap": 100,
    "Switch": 15,
    "Medical Syringe": 50,
    "Table": 100,
    "Targeting Computer": 2000,
    "Tarp": 50,
    "Tech Trash": 1000,
    "Thompson": 5,
    "Timer": 15,
    "Torch": 5,
    "Decorative Baubels": 5,
    "Decorative Plastic Candy Canes": 5,
    "Decorative Gingerbread Men": 5,
    "Tree Lights": 5,
    "Decorative Pinecones": 5,
    "Star Tree Topper": 5,
    "Decorative Tinsel": 5,
    "T-Shirt": 5,
    "Longsleeve T-Shirt": 5,
    "Tuna Can Lamp": 100,
    "Vending Machine": 100,
    "High External Stone Wall": 20,
    "High External Wooden Wall": 20,
    "Prison Cell Gate": 20,
    "Prison Cell Wall": 20,
    "Chainlink Fence Gate": 20,
    "Chainlink Fence": 20,
    "Garage Door": 20,
    "Netting": 20,
    "Shop Front": 20,
    "Metal Shop Front": 20,
    "Metal Window Bars": 20,
    "Reinforced Window Bars": 20,
    "Wooden Window Bars": 20,
    "Reinforced Glass Window": 20,
    "Watch Tower": 20,
    "Water": 2000000,
    "Large Water Catcher": 20,
    "Small Water Catcher": 20,
    "Water Barrel": 100,
    "Water Jug": 5,
    "Water Purifier": 100,
    "Festive Window Garland": 100,
    "Wire Tool": 15,
    "Wood": 600000,
    "Wood Chestplate": 5,
    "Wood Armor Pants": 5,
    "Work Bench Level 1": 100,
    "Work Bench Level 2": 100,
    "Work Bench Level 3": 100,
    "Christmas Lights": 100,
    "Christmas Tree": 100,
    "XOR Switch": 15
  }
}​

and here is my config json as well

{
  "Settings": {
    "CategoryDefaultStack": {
      "Ammunition":1000,
      "Attire": 5,
      "Common": 100,
      "Component": 500,
      "Construction": 200,
      "Food": 1000,
      "Items": 100,
      "Medical": 50,
      "Misc": 1000,
      "Resources": 2000000,
      "Tools": 5,
      "Traps": 5,
      "Weapon": 5
    },
    "DefaultStack": 100,
    "StackHealthItems": true
  }
}​

You might have an option on your "dashboard" or what ever gameservers calls your control panel, to open your oxide/data folder and create a new folder for Stack size controller, then copy paste the data json into it,

Thank you for looking out, I appreciate it. I reloaded the plugin via, ox.grant reload and for whatever reason that seems to have resolved the issue thank the lawd! I appreciate you going out of your way to help me out though, now if i can just figure out whats going on with my quicksmelt lol.

sorry bro did'nt think about,all works fine now thk

hi dude it works with all now except with the tools,and there is a little "bug" with gun,if u unload it,stack it than separate it u get back the munition.