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Windmill Resources

Resources store credentials and configuration for external services.

File Format

Resource files use the pattern: {path}.resource.json

Example: f/databases/postgres_prod.resource.json

Resource Structure

{
  "value": {
    "host": "db.example.com",
    "port": 5432,
    "user": "admin",
    "password": "$var:g/all/db_password",
    "dbname": "production"
  },
  "description": "Production PostgreSQL database",
  "resource_type": "postgresql"
}

Required Fields

  • value - Object containing the resource configuration
  • resource_type - Name of the resource type (e.g., "postgresql", "slack")

Variable References

Reference variables in resource values:

{
  "value": {
    "api_key": "$var:g/all/api_key",
    "secret": "$var:u/admin/secret"
  }
}

Reference formats:

  • $var:g/all/name - Global variable
  • $var:u/username/name - User variable
  • $var:f/folder/name - Folder variable

Resource References

Reference other resources:

{
  "value": {
    "database": "$res:f/databases/postgres"
  }
}

Common Resource Types

PostgreSQL

{
  "resource_type": "postgresql",
  "value": {
    "host": "localhost",
    "port": 5432,
    "user": "postgres",
    "password": "$var:g/all/pg_password",
    "dbname": "windmill",
    "sslmode": "prefer"
  }
}

MySQL

{
  "resource_type": "mysql",
  "value": {
    "host": "localhost",
    "port": 3306,
    "user": "root",
    "password": "$var:g/all/mysql_password",
    "database": "myapp"
  }
}

Slack

{
  "resource_type": "slack",
  "value": {
    "token": "$var:g/all/slack_token"
  }
}

AWS S3

{
  "resource_type": "s3",
  "value": {
    "bucket": "my-bucket",
    "region": "us-east-1",
    "accessKeyId": "$var:g/all/aws_access_key",
    "secretAccessKey": "$var:g/all/aws_secret_key"
  }
}

HTTP/API

{
  "resource_type": "http",
  "value": {
    "baseUrl": "https://api.example.com",
    "headers": {
      "Authorization": "Bearer $var:g/all/api_token"
    }
  }
}

Kafka

{
  "resource_type": "kafka",
  "value": {
    "brokers": "broker1:9092,broker2:9092",
    "sasl_mechanism": "PLAIN",
    "security_protocol": "SASL_SSL",
    "username": "$var:g/all/kafka_user",
    "password": "$var:g/all/kafka_password"
  }
}

NATS

{
  "resource_type": "nats",
  "value": {
    "servers": ["nats://localhost:4222"],
    "user": "$var:g/all/nats_user",
    "password": "$var:g/all/nats_password"
  }
}

MQTT

{
  "resource_type": "mqtt",
  "value": {
    "host": "mqtt.example.com",
    "port": 8883,
    "username": "$var:g/all/mqtt_user",
    "password": "$var:g/all/mqtt_password",
    "tls": true
  }
}

Custom Resource Types

Create custom resource types with JSON Schema:

{
  "name": "custom_api",
  "schema": {
    "type": "object",
    "properties": {
      "base_url": {"type": "string", "format": "uri"},
      "api_key": {"type": "string"},
      "timeout": {"type": "integer", "default": 30}
    },
    "required": ["base_url", "api_key"]
  },
  "description": "Custom API connection"
}

Save as: custom_api.resource-type.json

OAuth Resources

OAuth resources are managed through the Windmill UI and marked:

{
  "is_oauth": true,
  "account": 123
}

OAuth tokens are automatically refreshed by Windmill.

Using Resources in Scripts

TypeScript (Bun/Deno)

export async function main(db: RT.Postgresql) {
  // db contains the resource values
  const { host, port, user, password, dbname } = db;
}

Python

class postgresql(TypedDict):
    host: str
    port: int
    user: str
    password: str
    dbname: str

def main(db: postgresql):
    # db contains the resource values
    pass

CLI Commands

# List resources
wmill resource list

# List resource types with schemas
wmill resource-type list --schema

# Get specific resource type schema
wmill resource-type get postgresql

# Push resources to Windmill — deploys to the workspace and can be destructive to
# remote state, so only run it when the user explicitly asks to deploy/publish/push
wmill sync push