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How Using Fetch with the Streams API Gets You Faster UX with GenAI Apps

Generative AI enables us to build incredible new types of applications, but large language model (LLM) responses can be slow. If we wait for the full response before updating the user interface, we might be making our users wait more than they need to. Thankfully, most LLM APIs—including OpenAI, Anthropic, and Langflow provide streaming endpoints that you can use to stream responses as they are generated. In this post, we’re going to see how to use JavaScript’s fetch API to immediately update your front-end application as an LLM generates output and create a better user experience.