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1. Add a Responder at the beginning of the suite to serve as the entry point for all incoming requests.
2. Chain a validation tool (such as a JSON Validator or a GraphQL Query Validator) to the Pre-correlation Incoming Request output of the responder.
   
3. Chain a Text Data Bank to the validation tool. When you're done, you should have a setup similar to the one below.
   
4. Configure the Text Data Bank to extract the validation result into a variable. In the example below, it is being extracted into a variable called validation_error.
   
5. Configure the Responder Correlation of the Message Responder to reference the extracted validation result using one of the methods described below.
   • Method 1 - XPath Custom Scripting (preferred):
     To use XPath to evaluate the validation results, add an XPath like the following under Responder Correlation > Request Body > XPath:
     string-length("${validation_error}") > 0
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Method 2 - Custom Scripting:
     To use a script to evaluate the validation results, add a script like the following under Responder Correlation > Custom (Groovy):
     

     Code Block
     def correlateOnValidationError(context) { value = context.getValue("Generated Data Source", "validation_error") return value != null && value.length() > 0 }

     
     
   • Method 2 - XPath:
     To use XPath to evaluate the validation results, add an XPath like the following under Responder Correlation > Request Body > XPath:
     string-length("${validation_error}") > 0
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6. Configure the responder payload of the Message Responder to return a custom error message when a request fails validation like the following:
   

   Code Block
   { "status": 400, "error" : "${validation_error}" }