How to find custom fields exact keys so that they can be used when registering new members from code?

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Question:
How to find custom fields exact keys so that they can be used when registering new members from code?

Product:
Velo

What are you trying to achieve:
I’m trying to build a custom registration process, where members/contacts have custom fields that I already added on the site dashboard.

What have you already tried:
My code looks like:

import { authentication } from 'wix-members-frontend';

     $w.onReady(async function () {
        const options = {
            contactInfo: {
                //the keys of customFields are identical to the names of custom fields as I can see them on the site dashboard, under Contacts/Members
                customFields: {"Company": "xyzzy", "Position": "abcd", "First Name": "abcd"}
            },
            privacyStatus: 'PRIVATE'
        };
    
    
    
        return authentication.register(email, password, options)
            .then((registrationResult) => {
                //return registrationResult;
                const status = registrationResult.status;
    
    
                if (status === "PENDING") {
                    console.log('Member registered and waiting for approval:', registrationResult);
                } else {
                    console.log('Member registered and logged in:', registrationResult);
                }
            })
            .catch((error) => {
                console.error(error);
            })
    }

And I always get some error.
The last error I got is:
Unexpected value for field str_value @ @"

Additional information:
All my custom fields have thee type Text, and everything provided in the code through the dictionary customFields is Text too. Some of them were converted to string using JSON.stringify().

2

Hi! I haven’t tried setting custom fields upon registration, but I do access them quite a bit and they have a very specific syntax. Perhaps this might help you reverse engineer what you need?

Here’s the way to access custom field code (which you might already know):
member.contactDetails.customFields[“custom.yourCustomFieldName”].value

So from that, perhaps you need another “custom” layer before adding your customFields object?

I don’t know - just trying to help with the brainstorm (insert shrug emoji)