text/template component: Parse templates using text/template (opens new window). It is used in scenarios such as message format transformation, content templating, and data adaptation. It supports a rich set of template syntax and custom function extensions.

Configuration

Field	Type	Description	Default Value
template	string	Template content or template file path. Use the prefix file: to indicate a file path, such as file:/path/to/tpl.txt	None

Supported template variables:

• .id - Message ID
• .ts - Message timestamp (in milliseconds)
• .data - Raw message content
• .msg - Message body object (when of JSON type, you can access fields with .msg.field)
• .metadata - Message metadata object
• .type - Message type
• .dataType - Data type

Template example:

 {{ .msg.name }} - Retrieve the name field from the message
 {{ .metadata.deviceType }} - Retrieve the device type from metadata
 {{ .type }} - Retrieve the message type
 {{ .ts }} - Retrieve the message timestamp
 {{ if gt .msg.temperature 30 }}High Temperature{{ else }}Normal{{ end }} - Conditional judgment
 {{ range .msg.items }}{{ .name }},{{ end }} - Iterate over an array
 {{ printf "%.2f" .msg.value }} - Format a number
 {{ .msg.name | upper }} - Convert to uppercase
 {{ .msg.content | replace "old" "new" }} - Replace text

Configuration example

{
  "id": "s1",
  "type": "text/template",
  "name": "Template Transformation",
  "configuration": {
    "template": "type:{{ .type}}"
  }
}