January 2026 monthly summary for langchain-ai/docs focused on documenting new structured output capabilities and aligning with related feature work. Changes validated locally via docs dev, and prepared for broader onboarding of users integrating structured outputs with LangChain.js and Ollama. This update reduces confusion and speeds integration for users building structured-output pipelines.

December 2025 (langchainjs) delivered three major features improving configurability, testing reliability, and structured outputs: 1) Ollama integration: added support for a customizable base URL with fallback to environment variable, enabling flexible deployment against different Ollama endpoints; 2) Testing modernization: migrated test framework from Jest to Vitest and aligned tests with the mistral model for ongoing compatibility; 3) ChatOllama: introduced native structured outputs with function calling and JSON mode for structured responses. Business impact includes greater deployment flexibility, improved model compatibility, faster iteration, and enhanced developer productivity. Demonstrated technologies/skills include Vitest testing, Jest-to-Vitest migration, function calling, JSON structured outputs, and Ollama integration in a JS/TS stack.