Is the WordPress REST API installed and enabled in a vanilla WordPress 4.7 installation?

4.7 has it enabled by default. The easy way to check if it is working is just to visit the example.com/wp-json url, and you should get a list of registered end points there

There is no official option to disable it as (at least there was a talk about it not sure if it got in the release), some core functionality depends on it.

The most obvious things to check for if it is not working is your htaccess rules, and do you have a wp-json directory

Also, if /wp-json/wp/v2/posts type URLs don’t work for you, but /?rest_route=/wp-json/wp/v2/posts does, it means you need to enable pretty permalinks in the settings (suggested by Giles Butler in comments below).

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