Post User object to SQL Server db after signup

So, I have an existing application which I’m trying to modify and use Auth0 as Authentication provider instead of storing password in my local database. User object has multiple relationships so I still need my local database, right?
My main question is, how do I post a User object to my local database after User successfully signs up? (Without password, ofc)
I am using Angular as a frontend, .net core api as a backend and SQL Server as my local database.

My guess is towards Rules, Hooks and Database connections but I’m just overwhelmed.

Hi @rluka996,

Welcome to Auth0!

The answer will depend on a few things, as there are a few ways to create a relationship between the Auth0 data store and your backend DB.

The user_id issued by Auth0 can act as the link between the user’s token that is returned from Auth0 and your database. When you create a new user in your database, store the sub claim from the token (this is the user_id) to use as a UUID.

A few things to consider:

  • You can create new users when they don’t exist in your DB. When your app receives a token and verifies it, you can use the user_id (sub in the token) to look up the user in your backend DB. If the user doesn’t exist, you will know they are a new user and you should create a row/object for them.


  • You can use an action (the new version of rules/hooks released to GA today) to create a user in your backend DB via a POST request.
  • A post-registration action runs after a new Auth0 database or passwordless user is created. You can code an action that will call your backend database. This will not run when a social user logs in for the first time (google/linkedin/twitter/etc.)

Does that make sense?

Yes it does! Just a couple of questions if you don’t mind.

First option:
So where exactly in my Angular front-end would I do that? It’s kind of unclear to me where in code does that happen, I followed this guide. And every time user logs in/signs up I would extract user_id from token and check if that object exist in my db?

Second option:
Yeah, I just saw an action as a new option in Dashboard. Would I have to connect auth0 to my local database somehow(something like or just writing an action is enough? Also, is there a example of that kind of action?

Sorry for bothering you, I’m not very familiar with auth0, hope it’s not a problem.

Are you making requests to your backend API to request user information? (for example, if you were running a blog, when are you request the user’s blog post data to display in your angular app?)

Yes, you could make a post request to your backend API to create a user in your database. This means you have to have some mechanism to receive that request. With a SPA, you usually have a backend API that is handling this type of thing.

Yes, I am. It’s a pretty complex database for application like Skyscanner with Users and their bookings, reviews, friends etc. So currently, I have auth0’s callback url set to a certain url and in that component(that url) I’m posting User object to API like this:

this.auth.user$.subscribe(token => {
this.User= token;

and then I’m doing this:

let newUser = new NewUser({
** ExternalId: this.myToken.sub,**
** Email:,**
** Name: this.myToken[‘metadata’].name,**
** Surname: this.myToken[‘metadata’].surname,**
** City: this.myToken[‘metadata’].address,**
** PhoneNumber: this.myToken[‘metadata’].phoneNumber**
** });**

On the API service I’m checking if user already exist(if it does it’s a login, and I skip adding it to database, if it doesn’t its a signup and I add him).
But I’m pretty sure this isn’t the greatest solution. What would you recommend?

Could this be done by simply triggering an action in which I would send User object with fields required and then do all the work needed on actual API?

You could use a post registration action to send the user’s info to your backend API to be added to your database. Would that solve it?

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