formData property 'name' undefined when sending an email

Hello! I’ve just landed on a project that was using mailgun-js and I’m having some trouble migrating to mailgun.js package. The issue seems to be with form-data package. The client initialization is correct and when running the function return await mailgun.messages.create(mailgunDomain, messageData) the node app crashes with the following error

Request error! TypeError : Cannot read property 'name' of undefined 
 TypeError: Cannot read property 'name' of undefined
    at FormData._getContentDisposition (/Users/PERE/Developer/marketplace-mary-services/node_modules/form-data/lib/form_data.js:227:40)
[...]

I see that form-data expects a value that I think mailgun.js should provide, maybe?

Here is my initialization

const Mailgun = require('mailgun.js')
const formData = require('form-data')
const mailgun = new Mailgun(formData)
const { MAILGUN_KEY, MAILGUN_HOST } = process.env
const mg = mailgun.client({
  username: 'api',
  key: MAILGUN_KEY,
  url: MAILGUN_HOST
})

And the packages installed are the following in package.json

"form-data": "^4.0.0",
"mailgun.js": "^5.2.2",

What am I missing here?

[olexandr-mazepa]

It happens because the SDK handles property with the name ‘file’ as a file description. Here is a block of code that does that. https://github.com/mailgun/mailgun.js/blob/9d56b32d3d5f4fc7903dcdb368e338dc7b1a694e/lib/formDataBuilder.ts#L17-L21

I will change this behavior and publish the fix soon. Until I do that, as a temporary solution you can simply remove this property from the message data.

If I am not mistaking template is already compiled to HTML after these lines https://github.com/pmontp19/mailgun-example/blob/57e1c6c30a1960e44c917ad070917103eba34b59/index.js#L17-L18 so it looks like you don’t need the filename anymore in message data.

[ralyodio]

I’m still having this problem…and i’m not passing a file property.