req-dedup-middleware
This middleware aims to avoid duplicated requests made by the client.
Installation
yarn add req-dedup-middleware
# Storage
yarn add @keyv/redis
# or
yarn add @keyv/mongo
Usage :
import duplicate from "req-dedup-middleware";
// or
const duplicate = require("req-dedup-middleware").default;
const express = require("express");
const app = express();
app.use(duplicate({
expiration: 10000,
key: "requestId",
prefix: "root"
}));
app.get("/", (req, res) => res.end("Hey!"));
app.listen(8080, () => console.log("Listening!"));Options
{
expiration: 10000, /* Expiration time of the request in milliseconds */
key: "id", /* Property which contains the id
* should be a string or a function
* with a req paramater which returns a string
*/
prefix: "requests", // Prefix to group requests in storage
response: {
statusCode: 429, // The status code to send if request is duplicated
json: {} // Javascript plain object to send if request is duplicated
},
connectionUri: "" // Leave empty to store object in memory, or use redis:// or mongodb://
}External storage
If you want to use an external storage (currently supported are Redis and MongoDB), you need to install one of the following package :
yarn add @keyv/mongo # TTL monitor runs every minute (not configurable)
yarn add @keyv/redis # TTL process runs every second