# Parameter Transformation

This article will show you how to perform API transformation on OpenAPIHub, for example, adding a header in an API request

You need to create an API before transforming an API, please follow ”Add API as Providers” to create an API.

# Where to Transform API?

You can transform API by editing an API, please refer to “Edit API as Providers” for how to edit an API.

# How to Create a Transformation?

  1. On the Transformations tab, select "Request" or "Response" then click Create .
  2. Fill in the form with all required information, including
    1. Parameter Type
    2. Action
    3. Key *Please be reminded not to use the ”List of Reserved Words for API Transformation
    4. Type
    5. Value
  3. Click Save after you're done.