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Upstash works with Redis® API, that means you can use any Redis client with Upstash. At the Redis Clients page you can find the list of Redis clients in different languages. Simplest way to connect to your database is to use redis-cli. Because it is already covered in Getting Started, we will skip it here.

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Database

After completing the getting started guide, you will see the database page as below:
The connection details required for Redis clients are displayed here: Endpoint, Port, and Token (which is also the password of the database). You can also find the environment variables UPSTASH_REDIS_REST_URL andUPSTASH_REDIS_REST_TOKEN on this page. Below, we will provide examples from popular Redis clients, but the information above should help you configure all Redis clients similarly.
TLS is enabled by default for all Upstash Redis databases. It’s not possible to disable it.

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@upstash/redis

@upstash/redis is the official SDK developed and maintained by Upstash. It is HTTP-based, which makes it ideal for serverless environments like Vercel and Cloudflare Workers. In highly concurrent serverless workloads, TCP-based clients can run into connection issues. 
import { Redis } from "@upstash/redis";

const redis = new Redis({
  url: "UPSTASH_REDIS_REST_URL",
  token: "UPSTASH_REDIS_REST_TOKEN",
});

(async () => {
  try {
    const data = await redis.get("key");
    console.log(data);
  } catch (error) {
    console.error(error);
  }
})();
See the Connect with @upstash/redis page for more information.

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Node.js

Library: ioredis 
const Redis = require("ioredis");

let client = new Redis("rediss://:YOUR_PASSWORD@YOUR_ENDPOINT:YOUR_PORT");
await client.set("foo", "bar");
let x = await client.get("foo");
console.log(x);

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Python

Library: redis-py 
import redis
r = redis.Redis(
host= 'YOUR_ENDPOINT',
port= 'YOUR_PORT',
password= 'YOUR_PASSWORD',
ssl=True)
r.set('foo','bar')
print(r.get('foo'))

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Java

Library: jedis 
Jedis jedis = new Jedis("YOUR_ENDPOINT", "YOUR_PORT", true);
jedis.auth("YOUR_PASSWORD");
jedis.set("foo", "bar");
String value = jedis.get("foo");
System.out.println(value);
Jedis does not offer command level retry config by default, but you can handle retries using connection pool. Check Retrying a command after a connection failure

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PHP

Library: phpredis 
<?php

$redis = new Redis();

$redis->connect("YOUR_ENDPOINT", "YOUR_PORT");
$redis->auth("YOUR_PASSWORD");

$redis->set("foo", "bar");

print_r($redis->get("foo"));
Phpredis supports connection level retries through OPT_MAX_RETRIES. However, for command level retries, it only supports SCAN command.

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Go

Library: redigo 
func main() {
  c, err := redis.Dial("tcp", "YOUR_ENDPOINT:YOUR_PORT", redis.DialUseTLS(true))
  if err != nil {
      panic(err)
  }

  _, err = c.Do("AUTH", "YOUR_PASSWORD")
  if err != nil {
      panic(err)
  }

  _, err = c.Do("SET", "foo", "bar")
  if err != nil {
      panic(err)
  }

  value, err := redis.String(c.Do("GET", "foo"))
  if err != nil {
      panic(err)
  }

  println(value)
}