cliffkoh / graphql.js

GitHub GraphQL API client for browsers and Node

graphql.js

GitHub GraphQL API client for browsers and Node

• Usage
  • Send a simple query
  • Authentication
  • Variables
  • Pass query together with headers and variables
  • Use with GitHub Enterprise
  • Use custom @octokit/request instance
• Errors
• Partial responses
• Writing tests
• License

Usage

Browsers	Load @octokit/graphql directly from cdn.pika.dev <script type="module"> import { endpoint } from "https://cdn.pika.dev/@octokit/graphql"; </script>
Node	Install with npm install @octokit/graphql const { graphql } = require("@octokit/graphql"); // or: import { graphql } from "@octokit/graphql";

Send a simple query

const { repository } = await graphql(
  `
    {
      repository(owner: "octokit", name: "graphql.js") {
        issues(last: 3) {
          edges {
            node {
              title
            }
          }
        }
      }
    }
  `,
  {
    headers: {
      authorization: `token secret123`,
    },
  }
);

Authentication

The simplest way to authenticate a request is to set the Authorization header, e.g. to a personal access token.

const graphqlWithAuth = graphql.defaults({
  headers: {
    authorization: `token secret123`,
  },
});
const { repository } = await graphqlWithAuth(`
  {
    repository(owner: "octokit", name: "graphql.js") {
      issues(last: 3) {
        edges {
          node {
            title
          }
        }
      }
    }
  }
`);

For more complex authentication strategies such as GitHub Apps or Basic, we recommend the according authentication library exported by @octokit/auth.

const { createAppAuth } = require("@octokit/auth-app");
const auth = createAppAuth({
  id: process.env.APP_ID,
  privateKey: process.env.PRIVATE_KEY,
  installationId: 123,
});
const graphqlWithAuth = graphql.defaults({
  request: {
    hook: auth.hook,
  },
});

const { repository } = await graphqlWithAuth(
  `{
    repository(owner: "octokit", name: "graphql.js") {
      issues(last: 3) {
        edges {
          node {
            title
          }
        }
      }
    }
  }`
);

Variables

⚠️ Do not use template literals in the query strings as they make your code vulnerable to query injection attacks (see #2). Use variables instead:

const { lastIssues } = await graphql(`query lastIssues($owner: String!, $repo: String!, $num: Int = 3) {
    repository(owner:$owner, name:$repo) {
      issues(last:$num) {
        edges {
          node {
            title
          }
        }
      }
    }
  }`, {
    owner: 'octokit',
    repo: 'graphql.js'
    headers: {
      authorization: `token secret123`
    }
  }
})

Pass query together with headers and variables

const { graphql } = require('@octokit/graphql')
const { lastIssues } = await graphql({
  query: `query lastIssues($owner: String!, $repo: String!, $num: Int = 3) {
    repository(owner:$owner, name:$repo) {
      issues(last:$num) {
        edges {
          node {
            title
          }
        }
      }
    }
  }`,
  owner: 'octokit',
  repo: 'graphql.js'
  headers: {
    authorization: `token secret123`
  }
})

Use with GitHub Enterprise

let { graphql } = require("@octokit/graphql");
graphql = graphql.defaults({
  baseUrl: "https://github-enterprise.acme-inc.com/api",
  headers: {
    authorization: `token secret123`,
  },
});
const { repository } = await graphql(`
  {
    repository(owner: "acme-project", name: "acme-repo") {
      issues(last: 3) {
        edges {
          node {
            title
          }
        }
      }
    }
  }
`);

Use custom @octokit/request instance

const { request } = require("@octokit/request");
const { withCustomRequest } = require("@octokit/graphql");

let requestCounter = 0;
const myRequest = request.defaults({
  headers: {
    authentication: "token secret123",
  },
  request: {
    hook(request, options) {
      requestCounter++;
      return request(options);
    },
  },
});
const myGraphql = withCustomRequest(myRequest);
await request("/");
await myGraphql(`
  {
    repository(owner: "acme-project", name: "acme-repo") {
      issues(last: 3) {
        edges {
          node {
            title
          }
        }
      }
    }
  }
`);
// requestCounter is now 2

Errors

In case of a GraphQL error, error.message is set to the first error from the response’s errors array. All errors can be accessed at error.errors. error.request has the request options such as query, variables and headers set for easier debugging.

let { graphql } = require("@octokit/graphql");
graphqlt = graphql.defaults({
  headers: {
    authorization: `token secret123`,
  },
});
const query = `{
  viewer {
    bioHtml
  }
}`;

try {
  const result = await graphql(query);
} catch (error) {
  // server responds with
  // {
  // 	"data": null,
  // 	"errors": [{
  // 		"message": "Field 'bioHtml' doesn't exist on type 'User'",
  // 		"locations": [{
  // 			"line": 3,
  // 			"column": 5
  // 		}]
  // 	}]
  // }

  console.log("Request failed:", error.request); // { query, variables: {}, headers: { authorization: 'token secret123' } }
  console.log(error.message); // Field 'bioHtml' doesn't exist on type 'User'
}

Partial responses

A GraphQL query may respond with partial data accompanied by errors. In this case we will throw an error but the partial data will still be accessible through error.data

let { graphql } = require("@octokit/graphql");
graphql = graphql.defaults({
  headers: {
    authorization: `token secret123`,
  },
});
const query = `{
  repository(name: "probot", owner: "probot") {
    name
    ref(qualifiedName: "master") {
      target {
        ... on Commit {
          history(first: 25, after: "invalid cursor") {
            nodes {
              message
            }
          }
        }
      }
    }
  }
}`;

try {
  const result = await graphql(query);
} catch (error) {
  // server responds with
  // {
  //   "data": {
  //     "repository": {
  //       "name": "probot",
  //       "ref": null
  //     }
  //   },
  //   "errors": [
  //     {
  //       "type": "INVALID_CURSOR_ARGUMENTS",
  //       "path": [
  //         "repository",
  //         "ref",
  //         "target",
  //         "history"
  //       ],
  //       "locations": [
  //         {
  //           "line": 7,
  //           "column": 11
  //         }
  //       ],
  //       "message": "`invalid cursor` does not appear to be a valid cursor."
  //     }
  //   ]
  // }

  console.log("Request failed:", error.request); // { query, variables: {}, headers: { authorization: 'token secret123' } }
  console.log(error.message); // `invalid cursor` does not appear to be a valid cursor.
  console.log(error.data); // { repository: { name: 'probot', ref: null } }
}

Writing tests

You can pass a replacement for the built-in fetch implementation as request.fetch option. For example, using fetch-mock works great to write tests

const assert = require("assert");
const fetchMock = require("fetch-mock/es5/server");

const { graphql } = require("@octokit/graphql");

graphql("{ viewer { login } }", {
  headers: {
    authorization: "token secret123",
  },
  request: {
    fetch: fetchMock
      .sandbox()
      .post("https://api.github.com/graphql", (url, options) => {
        assert.strictEqual(options.headers.authorization, "token secret123");
        assert.strictEqual(
          options.body,
          '{"query":"{ viewer { login } }"}',
          "Sends correct query"
        );
        return { data: {} };
      }),
  },
});

License

MIT