hp24-idemkit-fastify

Fastify plugin adding Idempotency-Key support to your routes. Part of idemkit.

npm install hp24-idemkit-fastify hp24-idemkit-core

Usage

import Fastify from 'fastify';
import { MemoryStore } from 'hp24-idemkit-core';
import idempotency from 'hp24-idemkit-fastify';

const app = Fastify();
await app.register(idempotency, { store: new MemoryStore() });

app.post('/charges', async () => ({ id: 'ch_123' }));

Implemented with a preHandler hook (short-circuits replays, conflicts, and mismatches) and an onSend hook (captures and persists the first successful response). Same semantics and options as the Express adapter: replay, 422 mismatch, 409/wait on duplicates, 5xx not cached.

For multi-instance deployments use RedisStore from hp24-idemkit-redis.

License

MIT