LaunchDarkly Has a Free Feature Flag Service — Ship Features Safely Without Redeploying

Deploying code should not equal releasing features. LaunchDarkly decouples deployment from release, letting you control who sees what — without touching your CI/CD pipeline.

Feature flags let you wrap new features in toggles. Ship the code, then gradually roll it out to 1%, 10%, 50%, 100% of users. If something breaks, kill the flag instantly — no rollback needed.

Why Feature Flags Matter

• Canary releases — test with 1% of users before full rollout
• Kill switches — instantly disable broken features
• A/B testing — show different variants to different user segments
• Trunk-based development — merge incomplete features behind flags
• Scheduled launches — flip a flag at midnight, no engineer needed

Free Tier (Starter Plan)

• Up to 1,000 monthly active users
• Unlimited feature flags
• Unlimited environments (dev, staging, prod)
• Server-side and client-side SDKs
• Flag targeting and segmentation

Quick Start: Node.js

import LaunchDarkly from '@launchdarkly/node-server-sdk';

const client = LaunchDarkly.init('your-sdk-key');
await client.waitForInitialization();

const context = {
  kind: 'user',
  key: 'user-123',
  email: '[e-mail]',
  custom: { plan: 'premium', country: 'US' }
};

const showNewCheckout = await client.variation('new-checkout-flow', context, false);

if (showNewCheckout) {
  renderNewCheckout();
} else {
  renderOldCheckout();
}

Progressive Rollouts

Roll out gradually with percentage-based targeting:

// In LaunchDarkly dashboard:
// Week 1: 10% of users
// Week 2: 25% of users
// Week 3: 50% of users
// Week 4: 100% if no errors

// Your code stays the same:
const enabled = await client.variation('new-search', context, false);

React Integration

import { withLDProvider, useFlags } from 'launchdarkly-react-client-sdk';

function App() {
  const { newDashboard, darkMode } = useFlags();
  return (
    <div className={darkMode ? 'dark' : 'light'}>
      {newDashboard ? <NewDashboard /> : <OldDashboard />}
    </div>
  );
}

export default withLDProvider({ clientSideID: 'your-client-id' })(App);

The Bottom Line

Feature flags turn risky big-bang releases into controlled, reversible rollouts. LaunchDarkly's free tier gives you everything you need to ship features with confidence.

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