| Server Error Log | Actual Problem | Fix | | :--- | :--- | :--- | | Unexpected token < in JSON | You accidentally saved an HTML character or BOM header. | Resave as UTF-8 without BOM in Notepad++. | | End of file expected | Missing closing bracket } or ] at the end. | Count your brackets. Use VS Code folding. | | Duplicate key | Two identical entry names in the same object. | You likely copy-pasted a flag. Delete the duplicate. | | F_8172163: Persistence read failed | JSON is corrupted; zero-length file. | Restore from a backup of the storage_1 folder. |

: Add the path to your cfggameplay.json under the objectSpawnerArr as follows: "objectSpawnerArr": ["custom/my_new_base.json", "custom/extra_trees.json"] .

Think of this as the "master switch" for your server's gameplay mechanics. Located in your mission folder (e.g., mpmissions/dayz_Auto.ChernarusPlus/ ), this file must be activated by adding enableCfgGameplayFile = 1; serverdz.config What it controls: Object Spawning: objectSpawnersArr

: Adjust stamina costs, walk/run speed, and knockdown thresholds. worldData : Customize weather, fog, and rain settings.

In DayZ, JSON files are used to store various game data, such as:

Use jq (command line tool) to compact your files:

To fully customize your server, you need to understand the primary JSON files located within your mpmissions folder:

Most modern mods use JSON to define their config settings. 2. Essential DayZ JSON Files Overview cfggameplay.json (Gameplay Settings)

: DayZ uses JSON files to define the loot system. These files specify what items can spawn on the map, under what conditions, and with what frequency.

with open(output_path, 'w', encoding='utf-8') as f: json.dump(merged, f, indent=2, ensure_ascii=False) print(f"\n✅ Merged data saved to output_path")

The log file ( *.RPT ) will explicitly state which JSON file is broken and on which line.

: The strict asset or item identifier class defined in the game engine.

The Ghost in the Machine: A Deep Dive into DayZ’s JSON Architecture

Use a merge tool (e.g., WinMerge or Meld) to compare your types.xml (converted to JSON via online tools) against the mod’s defaults. Do not just overwrite—preserve your custom loot economy.