How We Handle 17 Languages with WordPress + Polylang: A Technical Deep Dive

Running a WordPress site in 17 languages taught us things no documentation covers. Here is what we learned building kkinvesting.io . Polylang REST API Patterns Polylang exposes language data through the WP REST API, but it is underdocumented. # Get all posts in Japanese GET / wp - json / wp / v2 / posts ? lang = ja & per_page = 100 # Set language when creating a post POST / wp - json / wp / v2 / posts { " title " : " ... " , " lang " : " ja " , " translations " : { " en " : 123 }} Batch Publishing Pipeline We publish articles in batches: write the source (Traditional Chinese) → translate → localize → publish all languages. Our Python pipeline handles: Markdown to Gutenberg HTML conversion Language-specific slug generation Polylang translation linking Rank Math SEO metadata per language Cloudflare cache purging Hard Lessons PUT requests get blocked by Cloudflare — Use X-HTTP-Method-Override: PUT header Rate limit your batch operations — WordPress crashes if you fire too many PUT request