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feature-flags-nodejs

feature-flags-nodejs

github.com/posthogDevelopment76113 installsUpdated today
Repository

About feature-flags-nodejs

feature-flags-nodejs is a skill for adding PostHog feature flags to Node.js applications. It provides guidance on implementation practices and can use a connected PostHog MCP server to manage flags.

Key features

  1. 01Node.js feature flag setup guidance
  2. 02Environment-variable handling for keys
  3. 03Boolean-first flag checks
  4. 04Server-side evaluation preference
  5. 05PostHog MCP flag management guidance

Use cases

  1. 01Adding feature flags to a Node.js application
  2. 02Choosing implementation patterns for a framework
  3. 03Managing flags through a connected PostHog MCP server

MCP support

It advises checking for a connected PostHog MCP server and using its tools to create, list, update, or delete flags.

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/posthog/skills --skill feature-flags-nodejs

After installing, type/feature-flags-nodejsin Claude Code to confirm it loaded.

Bundled files

References and scripts installed along with SKILL.md.

references/
adding-feature-flag-code.md
best-practices.md
nodejs.md

Details

From the project README

PostHog feature flags for Node.js

This skill helps you add PostHog feature flags to Node.js applications.

Reference files

  • references/nodejs.md - Node.js feature flags installation - docs
  • references/adding-feature-flag-code.md - Adding feature flag code - docs
  • references/best-practices.md - Feature flag best practices - docs

Consult the documentation for API details and framework-specific patterns.

Key principles

  • Environment variables: Always use environment variables for PostHog keys. Never hardcode them.
  • Minimal changes: Add feature flag code alongside existing logic. Don't replace or restructure existing code.
  • Boolean flags first: Default to boolean flag checks unless the user specifically asks for multivariate flags.
  • Server-side when possible: Prefer server-side flag evaluation to avoid UI flicker.

PostHog MCP tools

Check if a PostHog MCP server is connected. If available, look for tools related to feature flag management (creating, listing, updating, deleting flags). Use these tools to manage flags directly in PostHog rather than requiring the user to do it manually in the dashboard.

Framework guidelines

No specific framework guidelines.

Comments

Markdown supported