apply_filters( ‘rest_url_prefix’, string $prefix )

User Contributed Notes

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   Farhan Noor 5 years ago

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   Flushing rewrite rules is required for new prefix to work. Simplest method is to visit Settings/Permalinks in your admin panel & Save Changes with existing settings. It will refresh your permalinks.
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   Ahmed Elgameel 2 years ago

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   If you want to change WordPress’s default REST API URL prefix from wp-json to another prefix e.g. api add the following code to your theme’s functions.php file or in a custom plugin:

   add_filter( 'rest_url_prefix', function () {
       return 'api';
   } );

   Now, refresh rewrite rules by going to Settings -> Permalinks and hit Save Changes.

   Your new REST API URL will be example.com/api/ instead of the default example.com/wp-json/.