You can now write custom code evals in JavaScript in addition to Python, giving you more flexibility and speed in your evaluation workflows. With JS code evals, get:

⚡️ Faster execution to reduce evaluation time and speed up your development

🔧 Work in your preferred stack:… pic.twitter.com/LITheqg1Sw

— LangChain (@LangChain) 10 octobre 2025

You can now write custom code evals in JavaScript in addition to Python, giving you more flexibility and speed in your evaluation workflows. With JS code evals, get: Faster execution to reduce evaluation time and speed up your development Work in your preferred stack:

→ View original post on X — @langchain