How to receive JSON data in controller with Drupal 8?

I’m using AngularJS one of my module’s settings page, so I have a javascript object in client side as a model. Could anyone help me please, how to catch this data in a controller if I send it as JSON with ajax?

This is the model I assembled is angular:

var model = {   title: 'This is a title',   url: '/random-custom-url',   description: 'little descrp',   blocks: [     {id: 1, name: 'block1', description: 'blockdecrtiption1', terms: [{"tid":"1","name":"term1","vid":"tags"}]},     {id: null, name: 'block2', description: 'blockdecrtiption2', terms: []},     {id: 3, name: 'block3', description: 'blockdecrtiption3', terms: []}   ] }; 

I’d like to “catch” it in a controller’s function(as a php associative array), so then I can process it and save to database(I have some own table in the database, created in the module’s hook_schema()). What’s the right route setup for this? In the controller’s function how can I get the data posted with ajax and how to convert it to associative array?

Thanks a lot!

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