Profile: Hector

Problem:
Can Views be used to output a valid JSON string?

Solution:
No, not a native way.

What you can do is applay a Custom Filter to render a raw View's Loop.
Then, in the Loop, you can use JSON format.

This is the function you need:
https://toolset.com/forums/topic/views-not-working-after-installing-v1-11/#post-345294

One more for reference:
https://toolset.com/forums/topic/error-using-cred_generic_field-to-let-user-select-the-post-author/#post-346275

A user also acheived this by another Plugin:
https://wordpress.org/plugins/views-output-formats/