How To Fix JSON_MESSAGES_WDR002 - Parsing of JSON string failed due to an illegal node type (&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: JSON_MESSAGES_WDR - Message class for ABAP JSON library

• Message number: 002

• Message text: Parsing of JSON string failed due to an illegal node type (&1)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message JSON_MESSAGES_WDR002 - Parsing of JSON string failed due to an illegal node type (&1) ?

  The SAP error message JSON_MESSAGES_WDR002 indicates that there was a failure in parsing a JSON string due to an illegal node type. This error typically occurs when the JSON data being processed does not conform to the expected structure or contains invalid elements.
  Cause
  The error can be caused by several factors, including:
  
  Invalid JSON Structure: The JSON string may have syntax errors, such as missing commas, brackets, or quotes.
  Unexpected Data Types: The JSON may contain data types that are not expected by the SAP application, such as a function or an unsupported type.
  Incorrect Node Types: The JSON parser encountered a node type that it does not recognize or cannot process, such as a circular reference or a complex object that cannot be serialized.
  Encoding Issues: There may be issues with character encoding that lead to malformed JSON.
  
  Solution
  To resolve the error, you can take the following steps:
  
  Validate JSON Structure: Use a JSON validator tool to check the syntax of the JSON string. Ensure that it is well-formed and adheres to JSON standards.
  Check Data Types: Review the expected data types in your SAP application and ensure that the JSON data matches these expectations. For example, if a string is expected, ensure that the value is not an object or array.
  Debugging: If you have access to the code that generates the JSON, add logging or debugging statements to inspect the JSON string before it is sent for parsing.
  Simplify JSON: If possible, simplify the JSON structure to isolate the problematic node. Start with a minimal valid JSON and gradually add elements back until the error reoccurs.
  Review Documentation: Check the SAP documentation for any specific requirements or limitations regarding JSON parsing in the context you are working with.
  Encoding Check: Ensure that the JSON string is properly encoded, especially if it contains special characters.
  
  Related Information
  
  SAP Notes: Check SAP Notes for any known issues or patches related to JSON parsing in your specific version of SAP.
  Community Forums: Look for discussions in SAP Community or other forums where similar issues may have been addressed.
  SAP Documentation: Refer to the official SAP documentation for guidelines on working with JSON in your specific SAP environment.
  
  By following these steps, you should be able to identify and resolve the cause of the JSON_MESSAGES_WDR002 error.