Is there any way that we can restrict metadata in case of DX API's

General
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how can we restrict metadata in DX API?

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The metadata is controlled or restricted to the fields defined in AllowedStartingFields Data transform. Please find the below link for more details

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You may also be interested in Security of Constellation applications

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In my opinion,
Metadata comes from the UI layer, so controlling the view is the key

What might help is:

  • Control it via View configuration (only include required fields)

  • Use field-level security (roles/privileges)

  • Or expose a custom API if you need stricter control

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What kind of metadata you mean? If you don’t use DX part of API and interested only in data part you can restrict uiResource being returned on response.