Redis Caching in Node.js – Download



In this video I will show you how to setup caching with Node.js & Redis and look at how it is beneficial.

Code:

const express = require('express');
const fetch = require('node-fetch');
const redis = require('redis');
const PORT = process.env.PORT || 5000;
const REDIS_PORT = process.env.PORT || 6379;
const client = redis.createClient(REDIS_PORT);
const app = express();
// Set response
function setResponse(username, repos) {
return `<h2>${username} has ${repos} Github repos</h2>`;
}
// Make request to Github for data
async function getRepos(req, res, next) {
try {
console.log('Fetching Data…');
const { username } = req.params;
const response = await fetch(`https://api.github.com/users/${username}`);
const data = await response.json();
const repos = data.public_repos;
// Set data to Redis
client.setex(username, 3600, repos);
res.send(setResponse(username, repos));
} catch (err) {
console.error(err);
res.status(500);
}
}
// Cache middleware
function cache(req, res, next) {
const { username } = req.params;
client.get(username, (err, data) => {
if (err) throw err;
if (data !== null) {
res.send(setResponse(username, data));
} else {
next();
}
});
}
app.get('/repos/:username', cache, getRepos);
app.listen(5000, () => {
console.log(`App listening on port ${PORT}`);
});

view raw
node_redis_cache.js
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