In this tutorial, we will demonstrate step by step guide to retrieve query parameters in Mule 4.

For example, let’s see how to retrieve the query parameters transaction_id and transaction_type that being sent by the client.

Retrieve Query Parameters in Mule 4

The common syntax to access the query parameters is attributes.queryParams.<<query_param_name>> or attributes.queryParams'[<<query_param_name>>']

Step 1: Create a sample Mule project with HTTP Listener.

Step 2: Add Transform message and paste the below code.

%dw 2.0
  output application/json
 ---
 {
      transactionDetails:
      {
          transactionType: attributes.queryParams.transaction_type,
          transactionId: attributes.queryParams.transaction_id,
      }
  }

You can also write an expression like this,

%dw 2.0
  output application/json
 ---
 {
      transactionDetails:
      {
          transactionType: attributes.queryParams['transaction_type'],
          transactionId: attributes.queryParams['transaction_id']
      }
  }

Step 3: Deploy your application and make a request.

That’s simple!

Conclusion

We hope this tutorial helped you to understand how to retrieve query parameters in Mule 4. You may also like,

• How to retrieve custom HTTP Headers in Mule 4
• How to insert inbound and outbound headers without redeploying Mule app