List all repositories that a GitHub App can access.

list-accessible-repositories.js

const { App } = require("@octokit/app"); // ^3.0.0
const Octokit = require("@octokit/rest"); // ^16.25.0

const APP_ID = 1337;
const PRIVATE_KEY = `-----BEGIN RSA PRIVATE KEY-----
...
your private key content
...
-----END RSA PRIVATE KEY-----`;

const listAccessibleRepos = async ({ appId, privateKey }) => {
  const app = new App({ id: appId, privateKey });
  const jwt = await app.getSignedJsonWebToken();
  const octokit = new Octokit({ auth: `Bearer ${jwt}` });
  const options = octokit.apps.listInstallations.endpoint.merge();
  const data = await octokit.paginate(options);
  const installationIds = data.map(({ id }) => id);
  const allUrls = await Promise.all(
    installationIds.map(async installationId => {
      const installationAccessToken = await app.getInstallationAccessToken({
        installationId,
      });
      const installationOctokit = new Octokit({
        auth: `token ${installationAccessToken}`,
        previews: ["machine-man-preview"],
      });
      const {
        data: { repositories },
      } = await installationOctokit.apps.listRepos();
      const urls = repositories.map(({ html_url }) => html_url);
      return urls;
    }),
  );
  console.log(allUrls);
};

listAccessibleRepos({ appId: APP_ID, privateKey: PRIVATE_KEY });