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🧩 PolyhydraGames Valheim REST Server

A modern replacement for RCON-based control of Valheim dedicated servers — exposing a full JSON REST API for in-game automation, integration, and remote management.

⚡ Overview

PolyhydraGames.Valheim.RestServer turns your Valheim dedicated server into a RESTful API host.
This allows local or remote tools (bots, dashboards, Twitch integrations, etc.) to trigger in-game actions via HTTP POST calls instead of legacy RCON commands.

Built for use with:

PolyhydraGames’ automation ecosystem (SpottieBot, ChannelCheevos, etc.)
Valheim mod developers wanting lightweight, stateless server integrations
Streamers and admins managing events and server logic remotely

🌐 API

Base URL

http://<server-ip>:8080

All endpoints accept POST requests with JSON payloads.
A full OpenAPI spec and Postman collection are provided:

📘 OpenAPI Spec (YAML)
🧰 Postman Collection (JSON)

🧱 Example Endpoints

Action	Endpoint	Example Body
Shake Player Camera	`POST /shake`	`json { "targetPlayer": "76561197962914477", "intensity": 5 }`
Play Sound Near Player	`POST /addnoise`	`json { "targetPlayer": "76561197962914477", "noise": "https://cdn.polyhydragames.com/audio/no.mp3", "position": { "x":10, "y":5, "z":3 } }`
Spawn Entity	`POST /spawn`	`json { "prefabName": "Troll", "count": 2, "position": { "x":0,"y":0,"z":0 } }`
Teleport Player	`POST /teleport`	`json { "targetPlayer": "76561197962914477", "position": { "x":100, "y":10, "z":50 } }`
Apply Effect	`POST /addeffect`	`json { "targetPlayer": "76561197962914477", "effectName": "SE_Rested" }`
Send Server Message	`POST /say`	`json { "message": "Server restarting in 5 minutes" }`

📦 Installation

Requires:
- BepInExPack for Valheim
- Jötunn (Valheim Library)
- HarmonyX
Install:
- Extract the mod into your server’s BepInEx/plugins folder.
- Restart your Valheim dedicated server.
Verify:
- On startup, look for:
```
[Info] PolyhydraGames REST API active on port 8080
```
- Visit http://localhost:8080/info or curl http://localhost:8080/serverStats.

🧰 Integration Ideas

Twitch / Channel Points
Trigger /smite, /spawn, /shake, or /addeffect from Twitch redeems.
OBS Overlay Widgets
Display /serverStats and /time updates live on stream.
Discord Bots
Run /say or /ban from a Discord slash command.
Automation Tools
Use n8n, Node-RED, or Zapier webhooks to interact with your server via the REST API.

🧩 Schema Overview

Common object types (simplified):

{
  "Vector3": { "x": 0.0, "y": 0.0, "z": 0.0 },
  "PlayerRequest": { "targetPlayer": "SteamID64" },
  "AddNoiseRequest": { "targetPlayer": "SteamID64", "noise": "url", "position": "Vector3" },
  "SpawnArgs": { "prefabName": "string", "position": "Vector3", "count": 1, "level": 1 }
}

🔒 Security Notes

The REST API is local by default — only accessible from the host machine.
To expose it externally, bind it to your public IP and protect it with:
- A reverse proxy (Nginx/Cloudflare)
- API key headers or token middleware (coming soon)
Avoid opening port 8080 publicly without access control.

🧰 Manifest Example

{
  "name": "PolyhydraGames_Valheim_RestServer",
  "version_number": "1.1.0",
  "website_url": "https://github.com/lancer1977/Valheim.RestServer",
  "description": "Exposes a RESTful API for Valheim server automation. JSON-based commands replace legacy RCON system.",
  "author": "PolyhydraGames",
  "dependencies": [
    "ValheimModding-Jotunn-2.26.1",
    "denikson-BepInExPack_Valheim-5.4.2102",
    "HarmonyX-2.10.1"
  ]
}

🧠 Developer Notes

All commands are implemented via Harmony patches and ZRoutedRpc actions. The REST bridge serializes incoming JSON into the same request DTOs used by the original RCON command handler (AddNoiseArgs, ShakeRequest, SpawnArgs, etc.).

Source: PolyhydraGames.Valheim.Core

Polyhydra Games Valheim Restful Service

Details

🧩 PolyhydraGames Valheim REST Server

⚡ Overview

🌐 API

Base URL

🧱 Example Endpoints

📦 Installation

🧰 Integration Ideas

🧩 Schema Overview

🔒 Security Notes

🧰 Manifest Example

🧠 Developer Notes

🧾 License

🧩 PolyhydraGames Valheim REST Server

⚡ Overview

🌐 API

Base URL

🧱 Example Endpoints

📦 Installation

🧰 Integration Ideas

🧩 Schema Overview

🔒 Security Notes

🧰 Manifest Example

🧠 Developer Notes

🧾 License