Error Handling in Mutation Resolver
We will create a resolver function for the above mutation specified, and implement a custom error handling logic that will get triggered whenever the query faces an error while running.
In the below code, we will look for the required fields in the mutations, and if either username or email is missing, we will throw the error of the missing required fields, so the UI would know that the query failed with the valid reason, and can show the message to the end user.
Javascript
const resolvers = { Mutation: { createUser: (_, { input }) => { // Extract input data const { username, email } = input; // Perform validation if (!username || !email) { throw new Error( "Missing required fields: username, email" ); } // Create user in the database try { console.log( 'newUser created!' !); } catch (error) { // Handle database errors console.error( "Error creating user:" , error); } }, }, }; |
Error Handling in Mutations in GraphQL
GraphQL is a powerful open-source query language for APIs. It is known for its flexibility and efficiency in fetching data from server endpoints. GraphQL mutations allow us to update the data in the GraphQL server. Oftentimes, the data update might fail because of several reasons, network failure, retry failure, etc. and so we need some error handling incase of the operation failure to handle it gracefully. In this article, we will explore how we can do error handling in mutations in GraphQL.
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