WordPress 4.7 will include the long awaited content endpoints. These endpoints are needed to display basic content types provided by WordPress core; posts, pages etc.
You can view the REST json responses in a browser but for serious development and testing of core endpoints as well as custom endpoints its best to setup a method for api calls.
There are a few options available to do this via apps, services and browser extensions. One beautiful and simple app to do this is Insomnia.
Here’s a tutorial video of a walk through setting up Insomnia for WP-API endpoints:
Insomnia WP-API Workspace file: https://gist.github.com/modemlooper/22488f5489c2513687003ee82a0e3dd1
Basic Auth plugin: https://github.com/WP-API/Basic-Auth
WP-API V2 Endpoint plugin: https://wordpress.org/plugins/rest-api/
WP Core Beta Tester plugin: https://wordpress.org/plugins/wordpress-beta-tester/
WP-API Docs: http://v2.wp-api.org