Custom Script Processor

Custom Script Processor

Overview

The Custom script processor allows users to extract specific values from api calls and to customize them using Javascript

---

Parameters

Each parameter is defined as a key-value pair inside the parameters section.

script_text

Required: True
Type: string
Defines the javascript callback that will be invoked once an API call will be reach this processor. The Javascript function executed would be:

function onAPICall(request, response){
  //your custom script 
  return void
}

Example:

- key: script_text
  value: |
  delete request.headers['secret']
  request.body.some_key = btoa(request.body.some_other_key) //convert to base64
  request.body.system_prompt += ", answer in spanish"

would generate the following function that will be invoked in runtime

function onAPICall(request, response){
  delete request.headers['secret']
  request.body.some_key = btoa(request.body.some_other_key) //convert to base64
  request.body.system_prompt += ", answer in spanish"
  return void
}

---

User Custom script Template

Custom script Processor Example

  CustomScript:
    processor: CustomScript  # Specifies the Custom script Processor
    parameters:
      - key: script_text 
        value: |
          delete request.headers['secret'];
          request.body.some_key = btoa(request.body.some_other_key); //convert to base64
          request.body.system_prompt += ", answer in spanish";

Use Case

You can use the CustomScript Processor to monitor calls to convert the message format of OpenAI API calls to anthropic's:

Custom script Processor Example

  CustomScript:
    processor: CustomScript  # Specifies the Custom script Processor
    parameters:
      - key: script_text
        value: |
          const originalMessages = request.body.messages;
          // Move the first 'system' message into Anthropic's 'system' field, if present
          const systemMsg = originalMessages.find(msg => msg.role === 'system');
          if (systemMsg) {
            request.body.system = systemMsg.content;
          }
          // Rebuild messages array for Anthropic
          // - Typically only user or assistant messages become Anthropic "messages"
          // - If you want to keep only user messages, filter by (msg => msg.role === 'user')
          const newAnthropicMessages = originalMessages
            .filter(msg => msg.role === 'user' || msg.role === 'assistant')
            .map(msg => {
              return {
                role: msg.role,
                content: [
                  {
                    type: 'text',
                    text: msg.content
                  }
                ]
              };
            });

          request.body.messages = newAnthropicMessages;