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WSO2 ESB uses Rhino engine to execute JavaScripts. Rhino engine converts the script to a method inside a Java class. Therefore, when processing large JSON data volumes, the code length must be less than 65536 characters, since the Script mediator converts the payload into a Java object. However, you can use the following alternative options to process large JSON data volumes.

• Achieve the same functionality via a Class mediator.
• If the original message consists of repetitive sections, you can use the Iterate mediator to generate a relatively small payload using those repetitive sections which . This will then allow you to use the Script mediator.