To be honest we could remove the id resolver as well! With Next.js setup, we’re going to add an API (server) route to our app. In addition, you can track Apollo client state and inspect GraphQL queries' key-value pairs. We demonstrate the set up via an example app, that let's you create, read, update, and delete journal entries. Many people only think of Next.js as a frontend React framework, providing server-side rendering, built-in routing, and a number of performance features. Deploy your Next.js and MySQL app with Vercel in a serverless environment. This is why the artist doesn’t have a name resolver, for example. There is an additional config we need to export, stopping the body of incoming HTTP requests from being parsed, a requirement for GraphQL to work correctly: If we would like to enable or limit cross-origin requests using CORS, we’re able to add the micro-cors package to enable this: In this case, I have limited the cross-origin HTTP methods to POST and OPTIONS, changing the default export to have our handler passed to the cors function. Which of these topics are you most interested in? 5 min read In this guide, we will walk you through creating and deploying a Next.js app with the most popular open source database in the world, MySQL, on Vercel. New video about Next.js API Routes using SQL Database This is a good starting point for beginners! Next.js is no longer just for the frontend (as you can see). All of this is still true, but since version 9, Next.js also supports API routes, an easy way to provide a backend to your React frontend code, all within the same package and setup. Do you spend a lot of time reproducing errors in your apps? with Next.js API routes. You should see a success message if the migration ran successfully. The migration for artists looks like this: And the migration for albums looks like this: With our tables in place, I ran the following insert statements in Postico to set up a few dummy records: The last step before updating our GraphQL API to load data from the database is to create a connection to our DB within the graphql.js file. If you want to follow along, there's no need to install … Interested to hear how LogRocket can improve your bug fixing processes? The project template gives you a fully complete CRUD application The easiest way to set up Next.js is to run the command npx create-next-app.If you don’t have npx installed, it can first be installed by running npm i -g npx to install it globally on your system.. By using it along with MySQL, you can create a fast, modern web app that interacts with customer data in a performant manner. Empty migration files are created with the command yarn run knex migrate:make create_artists (and a similar one for albums). Create a knexfile.js file, configuring Knex so it knows how to talk to our database. The arguments each resolver function receive are: Passing the typeDefs and resolvers to a new instance of ApolloServer gets us up and running: From the apolloServer we can access a handler, in charge of handling the request and response lifecycle. At the end of this example, we want to be able to perform the following query of albums and artists, loaded efficiently from our Postgres database: Setting up a GraphQL server involves four steps: After importing the gql function from apollo-server-micro (and having installed yarn add apollo-server-micro), we can define our type definitions, describing the schema of our GraphQL server. Eventually, we’ll expand on this, but for now, we have a field we can query called hello that responds with a String. Create a new Next.js project using the with-mysql template and enter the newly created directory: Creating a new Next.js project from with-mysql template and entering /next-mysql directory. He writes about React and Ruby on his blog (https://www.leighhalliday.com) and publishes React tutorials on YouTube (https://youtube.com/leighhalliday). Hard-coding data can get boring… it’s time to load it from the database! Which, if any, do you think would help you reproduce errors more effectively? Thanks! The above code will simply respond with the text “GraphQL!”, but with this setup we could respond with any JSON that we wanted, reading query params, headers, etc… from the req (request) object. Instead of guessing why problems happen, you can aggregate and report on problematic GraphQL requests to quickly understand the root cause. There’s a tiny bit of setup to get this up and running. The easiest way to set up Next.js is to run the command npx create-next-app. Setting up Next.js. Not bad for a day’s work! Marc-André Giroux has a great article on this problem, and we’re going to discover how to solve it right now! A solution to see exactly what a user did to trigger an error, Proactive monitoring which automatically surfaces issues, Having a support team triage issues more efficiently, Virtual scrolling: Core principles and basic implementation in React, Creating a Google Keep clone with React and Firebase, Using React Native to implement a carousel, Defining type definitions which describe the GraphQL schema, Creating resolvers: The ability to generate a response to a query or mutation, Creating a handler that will tie things into the Next.js API request and response lifecycle, arguments: In the first example which included, context: Context is global state, such as who the authenticated user is, or in our case, the global instance of DataLoader. The purpose of a loader is to pool up IDs (of artists in our case) to load and load them all at once in a single batch, rather than each one on its own: We need to pass our loader to our GraphQL resolvers, which can be done via context: This allows us to update our album resolver to utilize the DataLoader: The end result is a single query to the database to load all the artists at once… N+1 problem solved!