The goal is to configure the system to dynamically pass through the exact input data. The syntax {{input}} represents a variable or placeholder that references the entire incoming data object. This is a standard convention in many data integration and workflow automation platforms using templating engines like Handlebars or Mustache. By setting the "Additional input" to {{input}} and enabling "Send Only Additional input," the configuration ensures that for any given input, its complete data structure is dynamically used as the new payload. This approach is robust and works regardless of the specific content of the incoming data.

1. Handlebars.js Documentation: The {{...}} syntax is a core feature of templating engines like Handlebars. The documentation states

"A handlebars expression is a {{

some contents

followed by a }}." This syntax is used to embed and reference data objects within a template. In this context

{{input}} would reference the entire input object.

Source: Handlebars.js official documentation

"Expressions" section. (See: https://handlebarsjs.com/guide/#expressions)

2. n8n Documentation (Workflow Automation Platform): Modern workflow automation tools use this expression syntax to handle data. The n8n documentation explains how to reference incoming JSON data. For example

{{$json.body}} references the body of an incoming item. The variable {{input}} follows this exact principle for referencing the entire input data item.

Source: n8n Documentation

"Expressions

" section on "Data from other nodes." (See: https://docs.n8n.io/expressions/)

3. Postman Documentation (API Platform): The Postman API client extensively uses the {{variablename}} syntax to dynamically insert data into requests. This demonstrates the widespread

standard use of this notation for referencing data variables in technical configuration.

Source: Postman Learning Center

"Using variables

" section "Accessing variables in requests." (See: https://learning.postman.com/docs/sending-requests/variables/)