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You can store response data from one API call and use it in the request body of another. This is done using $sharedState, allowing seamless data sharing between Modify Response and Modify Request rules
$sharedState is only available in extension versions > v24.8.13 and desktop app versions > v1.7.1.

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Aggregate Data from API Response

1

Create a Modify Response Rule

Open Requestly and create a new Modify Response rule.
2

Select Dynamic Modification (JavaScript)

Choose Dynamic JavaScript Modification in the rule options
3

Store Response Data in $sharedState

Use the following code to store response values like products and currency:
function modifyResponse(args) {  const { method, url, response, responseType, requestHeaders, requestData, responseJSON } = args;   // Extract data from response  const productList = responseJSON.products;  const currency = responseJSON.currency;   // Store in shared state  $sharedState.productList = productList;  $sharedState.currency = currency;   return response; }

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Use Aggregated Data in Request Body

1

Create a Modify Request Body Rule

Create a new Modify Request Body rule in Requestly.
2

Select Dynamic Modification (JavaScript)

Select the Dynamic Modification option.
3

Use Data from $sharedState in the Request

Inject the stored products and currency into your outgoing request
Here’s the code to include the previously saved data:
function modifyRequestBody(args) {  const { method, url, body, bodyAsJson } = args;   // Retrieve shared state values  const products = $sharedState.productList;  const currency = $sharedState.currency;   // Inject into request body  return {  ...bodyAsJson,  products,  currency  }; }
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