LangServe is a newly launched tool designed to streamline the deployment of LangChain applications, enabling developers to easily transition from prototype to a production-ready API. Built as a Python package, LangServe leverages the LangChain Expression Language (LCEL) and the Runnable protocol to support efficient deployment of complex chains, with features like first-class streaming, async support, optimized parallel execution, and support for retries and fallbacks. It also introduces input and output schemas for validation and offers hosting solutions on platforms like GCP and Replit. The tool has been tested with applications like ChatLangChain and WebLangChain and aims to provide a seamless and scalable path for launching AI-driven applications. Future updates will include new functionalities, such as a playground for experimenting with prompts and retrievers, and support for saving multiple configurations of the same chain.