express-idempotency-cache

Idempotency middleware for Express to avoid duplicate requests processing of non-idempotency verbs of HTTP. Like PUT and POST, for example.

Getting started

Install the dependency.

npm install express-idempotency-cache --save

Integrate the middleware in your Express initialization

const idempotency = require('express-idempotency-cache');

const config = {
    adapter: 'redis' // "redis" or "memory"
    redis  : {
        hostname: 'url-to-your-redis-instalation.yourdomain.com',
        port    : 'port for your redis instalation' // optional
    },
    ttl: '86400' // If not specified, default is 24 hours
};

// ...express initialization
app.use(express.json())      // Body configuration SHOULD be declared BEFORE
app.use(express.urlencoded() // Body configuration SHOULD be declared BEFORE

app.use(idempotency.init(idempotencyConfig))

Add idempotency config to your routes

const idempotency = require('express-idempotency-cache');

app.post('/some-route', idempotency.set(500), function(request, response) {

    // Do your code here...

    // Send response
    response.json(yourResponseHere)
});

MIT License

Copyright (c) 2023 Leonardo Thibes

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.