In D7 we had
Can Migrate in D8 replace these? Eg, export views results with Migrate as json, csv etc?
You can you https://www.drupal.org/project/views_data_export for Drupal 8 as well. I am using this in my projects and its working fine.
There are some options to export Views data in CSV format in Drupal 8
This module is designed to provide a way to export large amounts of data from views. It provides a display plugin that can rendered progressively in a batch. Style plugins are included that support exporting in the following types:
- CSV Microsoft
- XLS (or really simple HTML understood by Excel)
- Microsoft DOC
- Basic TXT
The module adds 2 new Views Bulk Operations actions: Export to csv and export to Excel.
This module provides a CSV encoder for the Drupal 8 Serialization API. This enables the CSV format to be used for data input and output in various circumstances. For example:
Drupal 8's REST module can accept or return data in CSV format Views can output CSV data via a 'REST Export' view Module developers may leverage CSV as a format when using the Serialization API