insomnia/plugins/insomnia-plugin-cookie-jar/index.js

const { CookieJar } = require('tough-cookie');
/**
 * Get a request.jar() from a list of cookie objects
 */
 const jarFromCookies = (cookies) => {
  let jar;
  try {
    // For some reason, fromJSON modifies `cookies`.
    // Create a copy first just to be sure.
    const copy = JSON.stringify({ cookies });
    jar = CookieJar.fromJSON(copy);
  } catch (error) {
    console.log('[cookies] Failed to initialize cookie jar', error);
    jar = new CookieJar();
  }
  jar.rejectPublicSuffixes = false;
  jar.looseMode = true;
  return jar;
};

module.exports.templateTags = [
  {
    name: 'cookie',
    displayName: 'Cookie',
    description: 'reference a cookie value from the cookie jar',
    args: [
      {
        type: 'string',
        displayName: 'Cookie Url',
        description: 'fully qualified URL (e.g. https://domain.tld/path)',
      },
      {
        type: 'string',
        displayName: 'Cookie Name',
      },
    ],
    async run(context, url, name) {
      const { meta } = context;

      if (!meta.requestId || !meta.workspaceId) {
        return null;
      }

      const workspace = await context.util.models.workspace.getById(meta.workspaceId);

      if (!workspace) {
        throw new Error(`Workspace not found for ${meta.workspaceId}`);
      }

      const cookieJar = await context.util.models.cookieJar.getOrCreateForWorkspace(workspace);

      return getCookieValue(cookieJar, url, name);
    },
  },
];

function getCookieValue(cookieJar, url, name) {
  return new Promise((resolve, reject) => {
    const jar = jarFromCookies(cookieJar.cookies);

    jar.getCookies(url, {}, (err, cookies) => {
      if (err) {
        console.warn(`Failed to find cookie for ${url}`, err);
      }

      if (!cookies || cookies.length === 0) {
        console.log(cookies);
        reject(new Error(`No cookies in store for url "${url}"`));
      }

      const cookie = cookies.find(cookie => cookie.key === name);
      if (!cookie) {
        const names = cookies.map(c => `"${c.key}"`).join(',\n\t');
        throw new Error(
          `No cookie with name "${name}".\nChoices are [\n\t${names}\n] for url "${url}"`,
        );
      } else {
        resolve(cookie ? cookie.value : null);
      }
    });
  });
}