How to Implement Caching with Express

How to Implement Caching with Express

What is Express?

Express is a minimal Node.js web application framework. Its APIs provide web and mobile application functionality. Its simplicity enables users to quickly create a robust API in a familiar environment with enhanced features, including Robust routing, high performance, HTTP helpers, support for 14+ view template engines, content negotiation, and an executable for generating applications quickly.

What is a Cache?

A cache is a short-term, high-speed data storage layer that stores a subset of data, enabling it to be retrieved faster than accessing it from its primary storage location. Caching allows you to reuse previously retrieved data efficiently.

Caching Support in Keyv

Caching will work in memory by default. However, users can also install a Keyv storage adapter that is initialized with a connection string or any other storage that implements the Map API.

Example - Add Cache Support Using Express

const express = require('express');
const Keyv = require('keyv');

const keyv = new Keyv();

const app = express();

const ttl = 1000 * 60 * 60 * 24; // 24 hours

app.get('/test-cache/:id', async (req, res) => {
    if(! return res.status(400).send('Missing id param');
    const id =;
    const cached = await keyv.get(id);
    if(cached) {
        return res.send(cached);
    } else {
        const data = await getData(id);
        await keyv.set(id, data, ttl);
        return res.send(data);