Managing GQL errors

The GraphQL specification defines the error’s format. We have seen an example of it in the Implementing our first GQL query resolver section. The common properties are:

• message: A message description
• locations: The GraphQL request document’s coordinates that triggered the error
• path: The response field that encountered the error
• extensions: Optional field to include custom output properties

With Mercurius, we can customize the message error by throwing or returning an Error object:

  const resolvers = {
    Query: {
      family: async function familyFunc (parent, args,
      context, info) {
        const familyData =
          await context.familyDL.load(args.id)
        if (!familyData) {
  ...