Blog post snippet - https://medium.com/gofaros/a-guide-to-inbound-parse-with-sendgrid-nodejs-382a266f8c3f

A Guide to Inbound Parse with SendGrid (NodeJS).js

// Get signed_key
const msgKey = getSignedKey(req.body.text);
// Verify key
const keyContents = verifyKey(msgKey);
// Get the message that is being responded too
const prevMessage = await db.message.findById(keyContents.id);
// Validate the sender is in this conversation / allowed to respond 
const verifiedSender = await verifySender(keyContents, prevMessage);
// Parse message data
const emailMessage = parseEmail(req.body.text);
// Validate first time (idempotent)
const date = parseMessageDate(req.body.headers);
await validateEvent(keyContents, verifiedSender.id, date);
// Create message object
const newMessage = buildMessage(emailMessage, prevMessage.convo_id, verifiedSender.id);
// create message on the conversation and send out notifications
createMessage(verifiedSender.id, prevMessage.convo_id, newMessage);

It would be very helpful if you shared some of your parsing code (especially the parseEmail method where you get the body of the email). Thanks!

It would be very helpful if you shared some of your parsing code (especially the parseEmail method where you get the body of the email).

It would be very helpful if you shared some of your parsing code (especially the parseEmail method where you get the body of the email).

You don't need anything besides an normal node js post route such as:
router.post('/add', async function(req, res, next) { console.log(req.body); }

and in your app.js file :
app.use(express.urlencoded({ extended: true, type: ["form-data", "multipart/form-data"] }));