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 descriptionlocations: The GraphQL request document’s coordinates that triggered the errorpath: The response field that encountered the errorextensions: 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) {
...