rest - Different kinds of exception handling in nestjs (graphql)

Question

I am using GraphQLFederationModule in my nestjs project and now working on the exceptions handling part. I use formatError to catch all the exceptions thrown in resolvers.

Basically I have 4 kinds of source of exception:

1. Error in resolver/service logic that not related to other services.
2. Error from database, which is mongoDb (using nestjs/mongoose).
3. Error when calling api from other graphql servers using graphql-request.
4. Error when calling api from other restful api servers using axios.

For each kind of exceptions I need to handle it differently. So the question is, how can I determine which kind of exception it is from the error passed into formatError ?

Thank you.

question from:https://stackoverflow.com/questions/65847439/different-kinds-of-exception-handling-in-nestjs-graphql

Answer 1

I cannot find a "good" way to solve this so I just determine them by the content: https://github.com/VictorCheng114668/nestjs-helper/blob/main/graphqlModule-formatError-helper/exceptionsHandler.ts