Trouble expanding on aws appsync javascript resolver examples

MongoDB Atlas
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New to mongodb + aws combination and struggling to expand on a few great javascript resolvers created for this blog (listApplicants, addApplicants)–> The fullstack guide to using AWS AppSync and MongoDB Atlas | Front-End Web & Mobile

The blog examples above run fine. Tried to add “get a single applicant” resolver set up and I can’t seem to deploy it even after reviewing aws lambda/api examples. Similar with delete and update.

Here’s my toy code.

import { util } from '@aws-appsync/utils';

// https://www.mongodb.com/developer/products/atlas/atlas-data-api-aws-lambda/

export function request(ctx) {
  // how to grab id
  const id = ctx.args.id;
  return {
    method: 'POST',
    version: '2018-05-29',
    resourcePath: '/app/data-foofoo/endpoint/data/v1/action/findOne',
    params: {
      headers: {
        'api-key': secret,
        'Content-Type': 'application/json',
        'Access-Control-Request-Headers': '*',
        Accept: 'application/json',
      },
      body: {
        dataSource: 'foo-example-Cluster0',
        database: 'applicationEmployment',
        collection: 'employmentForm',
        //prettier-ignore
        // projection: { '_id': ObjectId(id) },
        projection: { _id: id },
      },
    },
  };
}

export function response(ctx) {
  console.log(ctx.result.body);
  //   const record = JSON.parse(ctx.result.body).documents;
  //   const record = JSON.parse(ctx.result.body);
  //   console.log(record);
  //   return record;
  if (res.id) {
    //// return ctx.stash.applicantData;
    return res;
  } else {
    util.error('record failed to be inserted');
  }
}

Thanks in advance.