[Resolved] Make WP API respond in a specific language

Problem:
You are developing a site and want the WordPress API to respond in English, despite the main website language being different. You tried using the WPML Hook with

do_action('wpml_switch_language', 'en');

but it did not work.
Solution:
We recommend using the

rest_request_before_callbacks

filter to force the WPML language for specific API endpoints. Here is an example of how you can implement this:

add_filter('rest_request_before_callbacks', function ($response, $handler, $request) {<br />    // Specify the endpoints you want to target (or apply globally).<br />    $target_endpoints = ['/wp/v2/posts', '/wp/v2/pages'];<br />    <br />    if (in_array($request->get_route(), $target_endpoints, true)) {<br />        // Switch WPML language context to English.<br />        do_action('wpml_switch_language', 'en');<br />    }<br />    <br />    return $response;<br />}, 10, 3);

Please note that we do not provide support for custom coding issues, but only guidance and examples as shown above. If you need further assistance, you might consider hiring a WPML Contractor.

This solution might be irrelevant if it's outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If this does not resolve your issue, please open a new support ticket.