For some integration scenarios, especially those involving Web APIs, JavaScript might be a more familiar choice than Groovy. SAP CPI supports a JavaScript engine, which you can use to process JSON payloads. The built-in 'JSON' object makes it incredibly easy to convert between JSON strings and JavaScript objects.

Key JavaScript Methods:

• JSON.parse(): Converts a JSON string into a JavaScript object. This is the first step for reading and manipulating data from an incoming JSON payload.
• JSON.stringify(): Converts a JavaScript object back into a JSON string. This is used to prepare the data for a subsequent step in the integration flow.

Example JSON Payload:

{
  "orderId": "ORD12345",
  "customer": {
    "name": "Jane Doe",
    "address": {
      "city": "London",
      "country": "GB"
    }
  },
  "status": "New"
}

Example JavaScript ('.js') Script:

importClass(com.sap.gateway.ip.core.customdev.util.Message);

function processData(message) {
    //Body
    var body = message.getBody(java.lang.String);
    var jsonObject = JSON.parse(body);

	// Access and modify a value
	jsonObject.status = "In Progress";
	jsonObject.customer.address.city = "Greater London";
	
	// Set a message header from the data
	message.setHeader("OrderId", jsonObject.orderId);
	
	// Stringify the object back to a JSON string and set the message body
	var newBody = JSON.stringify(jsonObject);
	message.setBody(newBody);
    
    return message;
}

Using these two methods, you can seamlessly read and write JSON data within your JavaScript steps, enabling powerful transformations and data enrichments.