caching query with redis - node.js

Question

i need to cache a query with redis and node js , the database is aws s3 ,the problem here as a noob ,i will recive the query as a string, i need to encode the keys in the body request so when i will later try to fetsch the data i will use one of those keys(they need to be seperated with '/') can anyone help me with that and bunch of thanks.
here is what i' tried to do:
const { default: axios } = require('axios');
const express = require('express');
const redisClient = require('./helper/Client')
const app = express();
const port = process.env.PORT || 3000
app.use(express.json());
async function fetchApi(species){
const apiResponse = await axios.get(`https://www.fishwatch.gov/api/species/${species}`)
console.log('request sent successfully');
return apiResponse.data
}
async function getSpeciesData(req, res) {
const species = req.body;
const keys = Object.keys(species);
const encodedParams = {};
for (const key of keys) {
const encodedKey = Buffer.from(key).toString('base64');
encodedParams[encodedKey] = species[key];
}
const key = JSON.stringify(encodedParams);
let resultat;
let isCached = false;
const cachedResponse = await redisClient.get(key);
if (cachedResponse) {
isCached = true;
const decodedResponse = Buffer.from(cachedResponse, 'base64').toString('utf-8');
resultat = JSON.parse(decodedResponse);
res.send({
fromCache: isCached,
data: resultat
});
console.log(cachedResponse);
} else {
const responseData = await fetchApi(keys.join('/'));
const encodedResponseData = Buffer.from(JSON.stringify(responseData)).toString('base64');
redisClient.SETEX(key, 3600, encodedResponseData);
res.send(responseData);
}
}
app.post("/fish", getSpeciesData);
app.listen(port, () => {
console.log(`Listening on ${port}`);
});