Node.js SDK

The server SDK evaluates flags locally against a cached ruleset, so reads are synchronous and add no latency to your request path.

Installation

Initialize & evaluate

import { FlagFish } from '@flagfish/node';

const ff = new FlagFish('ff_server_...');
await ff.ready();

const enabled = ff.variation(
  'checkout-redesign',
  { key: 'user_8f2', plan: 'pro' },
  false
);