Module development and code questions

Hello,

I can retrieve nodes by title filter, even upload images to nodes etc. via JSON API, works great.

In the entity type event I've got a field: image.
Now, via JSON API, I'd like to retrieve all nodes (or the 'next' node) that does not have an image.

How do I retrieve those?

I have setup the project. The project I got from someone. 
I have a react website and it is connected with headleass drupal. When I try to login the tokens are generated but the website stuck. When I see the logs in the drupal I get these error below.

I'm using Drupal commerce + commerce API modules in decoupled Drupal project. When doing the checkout frontend (in Angular) will call some third-party APIs and get some discounts for each order items. I need to update those discount details in Drupal DB.

I tried this with /jsonapi/checkout/{order_uuid} API like below. But this does not update anything in the DB.

I've created a a custom block module and i want to pass the current node to the block to allow me to show associated content.

I have this annotation at the top of the module:

Hello everyone,

Would be really grateful for some assistance.

I have built a Drupal web form and would like to display specific text fields in the form with prepopulated values so they are predefined for users when completing the form. 
 

The default values I need to display are dependent on the previous question in the form so I would need some code like - {if field C contains ‘AB’, display ‘123’ or if field C contains CD, display ‘456}

However there doesn’t seem to be an operator option for ‘contains’ in Drupal webforms? 
 

I have a commerce product, and one of it's fields is "Related products"

Each Product has :

• An entityID assigned by Drupal (obviously)
• A title
• A company assigned unique code (eg.SKU123)

I am building a table to export the products as CSV.

When I display the table, the column "related Products" returns the entity IDs of the related products. I want the SKU.

So, I've made a relationship between the "field_related_products" and the Products.