Parse multipart/form-data from body as string on AWS Lambda

Question

I\'m glad to see AWS now supports multipart/form-data on AWS Lambda, but now that the raw data is in my lambda function how do I process it?

I see multiparty is a g

Answer 1

If you want to get a ready to use object, here is the function I use. It returns a promise of it and handle errors:

import Busboy from 'busboy';
import YError from 'yerror';
import getRawBody from 'raw-body';

const getBody = (content, headers) =>
    new Promise((resolve, reject) => {
      const filePromises = [];
      const data = {};
      const parser = new Busboy({
        headers,
        },
      });

      parser.on('field', (name, value) => {
        data[name] = value;
      });
      parser.on('file', (name, file, filename, encoding, mimetype) => {
        data[name] = {
          filename,
          encoding,
          mimetype,
        };
        filePromises.push(
          getRawBody(file).then(rawFile => (data[name].content = rawFile))
        );
      });
      parser.on('error', err => reject(YError.wrap(err)));
      parser.on('finish', () =>
        resolve(Promise.all(filePromises).then(() => data))
      );
      parser.write(content);
      parser.end();
    })