Wordpress JsonAPI - /wp-json/ was not found on this server
In my case, I got this error after installing/configuring apache2 on my local linux machine. I finally found the error to be cause by the rewrite module not being enabled which I fixed using,
sudo a2enmod rewrite
as well as ensuring that my apache2.conf file (located in the folder /etc/apache2) has its<Directory> directive 'AllowOverride' set to all rather than none, from
<Directory /var/www/> Options Indexes FollowSymLinks AllowOverride None Require all granted</Directory>
to
<Directory /var/www/> Options Indexes FollowSymLinks AllowOverride All Require all granted</Directory>
then I restarted apache2 service and the problem was resolved.