Stitch schema is transforming the response from remote schema

[ghoshrahul]

Hi,

I have been using graphql-tools which was attached to graphql-yoga v1.18.3. As part of migration to version 2 and using stitchSchemas of the @graphql-tools/stitch v8.6.9 and above, I'm running into some challenges regarding the GraphQL errors. They are as follows:-

1. My server is connected to multiple downstream graphQL servers, and I'm using the stitch schema as mentioned in this doc. The query delegation is working perfectly fine, but when the downstream service returns an error in the graphQL format, then it is masking it at the server level. I understand the best practices don't involve error masking, and I want the error to show in my server. How can I achieve the same?

Sample response of the error from downstream service

{ "errors": [ { "message": "Invalid ModuleName or ProductName provided", "path": [ "saveFeedback" ], "locations": [ { "line": 3, "column": 3, "sourceName": null } ], "extensions": { "statusCode": "400" }, "errorType": "DataFetchingException" } ], "data": null }

Sample error returned from the server

{ "errors": [ { "message": "Unexpected error.", "path": [ "saveFeedback" ] } ], "data": null }

On debugging I see that the executor itself is transforming the response to the following:-

{ "errors": [ { "message": "Internal Server Error(s) while executing query", "extensions": null, "path": null } ], "data": null }

Please let me know if any other information is required

[ardatan]

I don't think this is an issue about GraphQL Tools.
You can disable error masking in Yoga;
https://www.graphql-yoga.com/docs/features/error-masking#disabling-error-masking

[ghoshrahul]

Right I checked one more thing, I have used envelop's useGraphQLMiddleware for transforming the middlewares. Could that possibly be a cause?

[ghoshrahul]

I have checked the issue, and it's an error on the developer end.

I just want to check another thing. How do we prevent other fields from going out to the client?

[ardatan]

There are transforms for that
https://github.com/ardatan/graphql-tools/tree/master/packages/wrap/src/transforms