It is easy to see the error in GraphQL. A successful GraphQL query is supposed to return a JSON object with a root field called "data." If your request query fails or partially fails, you will see a second root field called "errors" in the response. See the below example
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Example:
{
"data": { ... },
"errors": [ ... ]
}
Note: Sometimes, the request query fails or partially fails if the user requesting the data doesn't have the right access permission.