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Customizing user experiences using FastAPI and LaunchDarkly segment targeting

Use LaunchDarkly’s segment targeting feature to show users a customized FastAPI site.

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DeepSeek vs Qwen: local model showdown in Python, featuring LaunchDarkly AI Configs

Compare locally running models in Python, using LaunchDarkly AI configs.

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DeepSeek vs Qwen: local model showdown featuring LaunchDarkly AI Configs

Compare DeepSeek-R1 and Alibaba’s Qwen AI models, using LaunchDarkly AI configs.

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Quickly disable external API calls in your Sinatra application using LaunchDarkly kill switch flags

Disable 3rd-party API calls in a Sinatra application using the LaunchDarkly Ruby SDK

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Upgrade OpenAI models in ExpressJS applications — using LaunchDarkly AI configs

In this tutorial, we’ll teach you to use AI configs to upgrade the OpenAI model version in an ExpressJS application.

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Upgrade OpenAI models in Python FastAPI applications—using LaunchDarkly AI configs

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LaunchDarkly + Ghost: using feature flags to change styles in your CMS

In this post you’ll learn how to add LaunchDarkly feature flags to a site hosted on the Ghost CMS to change your site’s styling at the flick of a switch.

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Detecting vaccine misinformation in a custom Bluesky feed, using LaunchDarkly and OpenAI

In this tutorial, you’ll create a Bluesky custom feed in Python that filters posts based on keywords. You’ll use an OpenAI model to do basic sentiment analysis on the posts, discarding the ones that are likely to be misinformation. Then you’ll wrap the LLM call in a LaunchDarkly feature flag so you can quickly enable it when misinformation surges.

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Using LaunchDarkly Feature Flags in a Contentful + React Application

In this tutorial, you’ll learn how to use LaunchDarkly feature flags to show and hide front-end features in a Contentful + React web application.

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Email API showdown: testing Mailgun vs. Resend with LaunchDarkly feature flags

In this tutorial, you’ll learn how to use LaunchDarkly feature flags to toggle between 2 different email providers (Resend and Mailgun) in an ExpressJS application.

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Running a seasonally themed signup experiment with LaunchDarkly and ExpressJS

In this tutorial you’ll learn how to run an A/B experiment to give your signup flow some 🍁seasonally themed flavor ☠️, using LaunchDarkly and ExpressJS. All experiments should start with a hypothesis. Will changing the design to be a bit spooookier increase our conversion rate? Let’s find out!

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Mitigating signup spam spikes with LaunchDarkly and Twilio Verify in an ExpressJS app

 In this tutorial, we’ll build an ExpressJS demo app that has the flexibility to toggle extra verification layers on during spam attacks.  This demo combines Twilio Verify, a fraud verification API that can be used across many communications channels, with LaunchDarkly feature flags. Take that, spammers.

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Upgrade your APIs safely with Progressive Rollouts in an ExpressJS Application

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Upgrade your APIs safely with Progressive Rollouts in a Python FastAPI Application

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Creating customized user experiences using Express JS and LaunchDarkly segment targeting

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Quickly disable external API calls in your FastAPI application using FastAPI and LaunchDarkly kill switch flags

In this tutorial you will learn to add a kill switch to disable 3rd-party API calls in a FastAPI application, using the LaunchDarkly Python SDK.

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Business in the front, party in the back: creating customized user experiences using Fastify JS and LaunchDarkly

Treating every user the same is risky when they may have different goals, dreams, desires, and features they care about. To provide the best experience, you want to customize your website based on what you know about your users. Luckily, LaunchDarkly makes it easy to do just that. In this tutorial, you will learn how to use segment targeting to show users with a .edu email address a student version of your website using LaunchDarkly and Fastify.

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