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How do I individually implement stubs to functions invoked inside a parent function?

Assuming I have these functions (req1,req2...) that are HTTP Requests from external services that are all returning differing values, is there a way where I can apply stubs for req1 or req2 individually to mock their values?

The purpose of this is because I need to do this to test a function that relies on an OTP verification and I want to bypass said verification in order to cover all branches in my testing.

I am trying to write a simple function handling authentication POST requests that return JWT tokens.

My LoopBack 4 API returns the token as a JSON packet in the following format:

I'm trying to use a REST API apparently constructed with LoopBack and it requires that my filter parameters be encoded in a specific way.

What is this sort of transformation called?

I'm new to Loopback 4 and I've been trying to execute a native SQL query. I found how to do it, the thing is that don't have any clue of WHERE to put it in my code in order for it to work... here's the documentation I found.

I need to know where should I put this:

I followed up LoopBack JWT tutorial, but it didn't mention how to store credentials in a real datasource (ex. RDBM datasource)

To do that I simply created a datasource with connector: 'postgresql' but it didn't work because I always get this error message!

What's the benefit of defining BelongsTo relation?

When I defined HasMany relation I could execute all my queries without missing anyone (I prefer to give me an example in case you find it's important to use BelongsTo relation).

I have loopback 3 project. I want to build it. I am creating a bitbucket pipeline for this.

So for deployment, I want to know how to build loopback 3 project so that I can use these commands into my bitbucket.yml file.

I checked the documentations but for lb3 there is nothing for building the project. I got this into documentations: Preparing-for-deployment. But I am not user how I can use this into the yml file.

For loopback 4 we can use @loopback/build, and its working fine there. But I couldn't find anything for loopback 3.

Is there any other way to build loopback 3 project ?

Thanks in advance!

I want to add authentication to my server. I followed the docs here: https://loopback.io/doc/en/lb4/Authentication-tutorial.html

When I add this annotation @authenticate('jwt') I get the following error:

I have a pre-developed API connected to my backend. I am using loopback 4 as a data provider for my react application. I want to call the API using Loopback and get the result in my application. I went through the loopback 4 documentation calling other API's but found it a bit confusing. Data returned by my API is :
{ "name": "xyz", "place": "xyz", "email": "xyz" }

I want this data to be returned to my application using Loopback. I do not want to make a direct API call from my React application. I want Loopback to make all the API calls.
Any help is much appreciated.