# Nitro Express Middleware

_Express middleware for Nitro GraphQL IDE_

## Description

This middleware allows to setup _Nitro GraphQL IDE_ for your GraphQL server.

You can use a **cdn** hosted version of the app or a **self** hosted version using the ad hoc package.

## Installation

Install this package and the required `peerDependencies` in your project:

```sh
npm install @chillicream/nitro-express-middleware --save-dev
# or
yarn add @chillicream/nitro-express-middleware --dev
# or
pnpm add @chillicream/nitro-express-middleware --save-dev
```

**Note**: `@chillicream/nitro-embedded` is optional and only needed if you prefer to **self** host the app.

## Usage

Add the middleware to your app.

```javascript
import express from "express";
import nitroMiddleware from "@chillicream/nitro-express-middleware";

// ...

const app = express();

app.use(
  "/graphql",

  // for `cdn` hosted version
  nitroMiddleware({ mode: "cdn" })

  // for `embedded` version
  // nitroMiddleware({ mode: "embedded" }),

  // place here your graphql middleware and others
);

app.listen(3000, () => {
  console.log(`GraphQL on http://localhost:3000/graphql`);
});
```

### Extended configuration

- To pin a specific version instead of using "latest":

  ```javascript
  nitroMiddleware({
    mode: "cdn",
    target: { version: "3.0.0" },
  });
  ```

- To use your own infrastructure:

  ```javascript
  nitroMiddleware({
    mode: "cdn",
    target: "https://mycompany.com/nitro",
  });
  ```

### Custom options

- To pass `options` supported by _Nitro GraphQL IDE_:

  ```javascript
  nitroMiddleware({
    mode: "cdn",
    options: {
      title: "nitro",
    },
  });
  ```

## Recipes

<details id="graphql-http">
<summary><a href="#graphql-http"><sub><sup>🔗</sup></sub></a> With <a href="https://github.com/enisdenjo/graphql-http">graphql-http</a></summary>
<hr>

```javascript
import express from "express";
import { createHandler } from "graphql-http";
import { GraphQLObjectType, GraphQLSchema, GraphQLString } from "graphql";

import nitroMiddleware from "@chillicream/nitro-express-middleware";

const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: "Query",
    fields: {
      greeting: {
        type: GraphQLString,
        resolve(_parent, _args) {
          return "Hello, World!";
        },
      },
    },
  }),
});

const app = express();

const handler = createHandler({ schema });

app.use(
  "/graphql",

  // for `cdn` hosted version
  nitroMiddleware({ mode: "cdn" }),

  // for `embedded` version
  // nitroMiddleware({ mode: "embedded" }),

  async (req, res) => {
    try {
      const [body, init] = await handler({
        url: req.url,
        method: req.method,
        headers: req.headers,
        body: () =>
          new Promise((resolve) => {
            let body = "";
            req.on("data", (chunk) => (body += chunk));
            req.on("end", () => resolve(body));
          }),
        raw: req,
      });
      res.writeHead(init.status, init.statusText, init.headers).end(body);
    } catch (err) {
      res.writeHead(500).end(err.message);
    }
  }
);

app.listen(3000, () => {
  console.log(`GraphQL on http://localhost:3000/graphql`);
});
```

<hr>
</details>

<details id="graphql-yoga">
<summary><a href="#graphql-yoga"><sub><sup>🔗</sup></sub></a> With <a href="https://the-guild.dev/graphql/yoga-server">graphql-yoga</a></summary>
<hr>

```javascript
import express from "express";
import { createYoga, createSchema } from "graphql-yoga";

import nitroMiddleware from "@chillicream/nitro-express-middleware";

const graphQLServer = createYoga({
  schema: createSchema({
    typeDefs: /* GraphQL */ `
      type Query {
        greeting: String
      }
    `,
    resolvers: {
      Query: {
        greeting: () => "Hello, World!",
      },
    },
  }),
  logging: false,
});

const app = express();

app.use(
  "/graphql",

  // for `cdn` hosted version
  nitroMiddleware({ mode: "cdn" }),

  // for `embedded` version
  // nitroMiddleware({ mode: "embedded" }),

  graphQLServer
);

app.listen(3000, () => {
  console.log(`GraphQL on http://localhost:3000/graphql`);
});
```

<hr>
</details>

<details id="express-graphql">
<summary><a href="#express-graphql"><sub><sup>🔗</sup></sub></a> With <a href="https://github.com/graphql/express-graphql">express-graphql</a></summary>
<hr>

```javascript
import express from "express";
import { graphqlHTTP } from "express-graphql";
import { GraphQLObjectType, GraphQLSchema, GraphQLString } from "graphql";

import nitroMiddleware from "@chillicream/nitro-express-middleware";

const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: "Query",
    fields: {
      greeting: {
        type: GraphQLString,
        resolve(_parent, _args) {
          return "Hello, World!";
        },
      },
    },
  }),
});

const app = express();

app.use(
  "/graphql",

  // for `cdn` hosted version
  nitroMiddleware({ mode: "cdn" }),

  // for `embedded` version
  // nitroMiddleware({ mode: "embedded" }),

  graphqlHTTP({
    schema,
    graphiql: false,
  })
);

app.listen(3000, () => {
  console.log(`GraphQL on http://localhost:3000/graphql`);
});
```

<hr>
</details>

<details id="apollo-server">
<summary><a href="#apollo-server"><sub><sup>🔗</sup></sub></a> With <a href="https://www.apollographql.com/docs/apollo-server/">apollo-server-</a></summary>
<hr>

```javascript
import { ApolloServer } from "@apollo/server";
import { expressMiddleware } from "@apollo/server/express4";
import { ApolloServerPluginDrainHttpServer } from "@apollo/server/plugin/drainHttpServer";
import express from "express";
import http from "http";
import cors from "cors";
import bodyParser from "body-parser";

import nitroMiddleware from "@chillicream/nitro-express-middleware";

const typeDefs = `#graphql
  type Query {
    greeting: String
  }
`;

const resolvers = {
  Query: {
    greeting: () => "Hello, World!",
  },
};

const app = express();
const httpServer = http.createServer(app);
const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [ApolloServerPluginDrainHttpServer({ httpServer })],
});
await server.start();

app.use(
  "/graphql",

  // for `cdn` hosted version
  nitroMiddleware({ mode: "cdn" }),

  // for `embedded` version
  // nitroMiddleware({ mode: "embedded" }),

  cors(),
  bodyParser.json(),
  expressMiddleware(server, {
    context: async ({ req }) => ({ token: req.headers.token }),
  })
);

httpServer.listen({ port: 3000 }, () => {
  console.log(`GraphQL on http://localhost:3000/graphql`);
});
```

<hr>
</details>