Trailing Slash expt wp-json in .htaccess

REPLACE THIS :

# Redirection en ajoutant des slashs au urls
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*[^/])$ /$1/ [R=301,L]

WITH THIS :

<IfModule mod_rewrite.c>
RewriteEngine On

# Exclude URLs containing wp-json
RewriteCond %{REQUEST_URI} !^/wp-json/ [NC]

# Condition to check the requested URL does not correspond to an existing file.
RewriteCond %{REQUEST_FILENAME} !-f

# Rule to append a trailing slash to URLs not ending with one.
RewriteRule ^(.*[^/])$ /$1/ [R=301,L]
</IfModule>
With the modified rule, any URL containing wp-json will be exempted from the trailing slash addition.