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

Building on @AvnerSo :s answer, here's a simpler version of a function that gets the request body and headers as parameters and returns a promise of an object containing the form fields and values (skipping files):

const parseForm = (body, headers) => new Promise((resolve, reject) => {
  const contentType = headers['Content-Type'] || headers['content-type'];
  const bb = new busboy({ headers: { 'content-type': contentType }});

  var data = {};

  bb.on('field', (fieldname, val) => {
    data[fieldname] = val;
  }).on('finish', () => {
    resolve(data);
  }).on('error', err => {
    reject(err);
  });

  bb.end(body);
});