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Author:
Ajeet Raina, Former Developer Growth Manager at Redis

Deno and Redis

With over 80,000 stars and 670+ contributors, Deno is a popular modern runtime for JavaScript and TypeScript. It is built on V8, an open-source JavaScript engine developed by the Chromium Project for Google Chrome and Chromium web browsers.

deno

Features of Deno

  • Deno is secure by default. It executes code in a sandbox environment, disallowing runtime access to the underlying filesystem, environment variables and scripts.
  • Deno supports both JavaScript and TypeScript out of the box.
  • Deno ships as a single executable with no dependencies.
  • Comes with built-in utilities such as a dependency inspector (deno info) and a code formatter (deno fmt).

Getting Started

deno.land/x is a hosting service for Deno scripts. It caches releases of open source modules stored on GitHub and serves them at one easy-to-remember domain. These modules contain small scripts that demonstrate use of Deno and its standard module.

The basic format of code URLs is

https://deno.land/x/IDENTIFIER@VERSION/FILE_PATH

Example:

https://deno.land/std@0.126.0/examples

In order to use Redis with Deno you will need a Deno Redis client. In the following sections, we will demonstrate the use of an experimental implementation of a Redis client for Deno.

Step 1. Set up a free Redis Enterprise Cloud account

Visit developer.redis.com/create/rediscloud/ and create a free Redis Enterprise Cloud account. Once you complete this tutorial, you will be provided with the database endpoint URL and password. Save it for future reference.

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Database details

Step 2. Get Deno

brew install deno

Step 3. Verify if Deno is properly installed

deno -V
deno 1.19.0

Step 4. Create an empty file with the following content

The following code creates a connection to Redis using Deno:

import { connect } from 'https://deno.land/x/redis/mod.ts';
const redis = await connect({
hostname: 'redis-18386.c110-qa.us-east-1-1.ec2.qa-cloud.redislabs.com',
port: 18386,
password: 'XXXX',
});
const ok = await redis.set('foo', 'bar');
const foo = await redis.get('foo');

Replace the values of hostname and port to match those of your Redis database, and add an extra password field if needed.

Step 5. Executing the script

Deno can grab scripts from multiple sources. For example, you can provide a filename, a URL, or'-' to read the file from stdin. You can run a JavaScript or TypeScript program by executing deno run.

deno run --allow-net redis.ts

When you run the script, the value of foo should be output. You can verify this by running the monitor command:

redis-15692.c264.ap-south-1-1.ec2.cloud.redislabs.com:15692> monitor
OK
1646536310.435577 [0 122.171.165.94:50193] "AUTH" "(redacted)"
1646536310.475578 [0 122.171.165.94:50193] "SET" "foo" "bar"
1646536310.511578 [0 122.171.165.94:50193] "GET" "foo"

Additional references: