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Deno vs Bun: What are the main differences?

Node JS has been the default option for the JavaScript runtime environment, until the introduction of updated versions. The introduction of Deno and Bun has increased the runtime options for JavaScript developers. Make the right selection of JavaScript development from Deno vs Bun options and base the decision on relevant differences.

Deno vs Bun

Both Deno and Bun have similar runtime environments with few deviations. Take the right call on the selection of a JavaScript runtime platform designed to fit the development needs. It is easy to switch between the runtime environments with the advice of expert developers. A quick run-over will ensure analysis of the differentiators for the selection of the development platform. Even the Node Js vs Deno vs Bun will provide the right direction to ensure selection of the runtime environment.

Deno: The Detailed Information

It is the type of TypeScript & JavaScript developed by Ryan Dahl to overcome the shortcomings of Node JS. Deno has a security model that suits modern-day development needs and has multiple built-in tools. The key feature includes a built-in linter, bundling of scripts, TypeScript supports, and test runner.

Since its inception, Deno has made significant progress in the developer community due to multiple reasons. It comes with a V8 JavaScript engine to support the JavaScript runtime environment needs.

Deno is one of the self-contained binaries that can be installed in different ways as per suitable OS. The simple way to download and execute the script is as follows:

# Linux and macOS

$ curl –fsSL | sh

# Windows PowerShell

$ iwr -useb | iex

The advantages of Deno include –

● Security is the top priority

● It is supporting npm & Node modules

● It ensures top-level support for TypeScript

● For superior DX, Deno is adapting to higher web platform standards

Let us look at some of the disadvantages associated with Deno –

● It is less popular than Node JS among developers

● Some of the APIs in Deno are unstable and not ready for use

● Migrating from Node to Deno is hard

Set up the Deno development environment after running the script and add the official version of the Deno extension to VS Code. Deno is executing the code by default in the sandbox and for easy access, the developer will be asked for the relevant permissions. It is able to transpile TypeScript easily and increases the overall efficiency of development with deno development company.

Bun: The Detailed Information

It is the latest version of the JavaScript runtime environment. Bun was developed to be the drop-in replacement for the TypeScript and JavaScript apps that focuses mainly on performance levels. The platform is also regarded as an all-in-one solution with features like transpiler, bundler, and package management in one tool.

The main aims of Bun are as follows –

● It ensures faster execution of the JavaScript programs

● It provider faster tooling options

● It is the drop-in replacement for the current Node projects

Deno is using the same type of JavaScript execution engine as the Node, known as V8. The top priority behind the creation of the platform is to take JavaScript performance to the next level. Bun is programmed in Zig which is considered a low-level language with minimal memory management features. It is the reason for utilizing the extreme performance code and thus allowing the programs to be segfault.

Bun is primarily preferred as the npm-compatible package manager and gets tested on the larger repository that needs more than 3,000 packages. The use of the aforementioned tools ensures the speed-up of the development procedure and uses Bun’s transpiler to be used as a runtime. Deno is the suitable alternative to improved security structure for TypeScript and Bun is still in early development, with the aim to ensure faster JavaScript execution.

Deno Vs Bun – What Set the Platforms Apart?

There are different ways to evaluate the difference between the runtime environments but check the relevant points to ensure optimal use of results. Let us look at the prime difference between Deno and Bun –

Performance Comparison

Speed is the prime factor that sets apart Bun from Deno. Bun is at least 2.5x better speed between the two. It is because of the JavaScript Bun as the engine. Also, Bun is written as Zig which provides developers control over memory.

Web APIs

Bun has a series of Web APIs like WebSocket, Fetch, or ReadableStream that are different from the Deno. The use of APIs is making the entire development process simple and trustworthy.

Deno is having the APIs not available in Node JS. Deno is using the fetch API to send the HTTP requests and there is a list of vital APIs used by Deno to comply with the requirements.


Bun is able to transpile the TypeScript files easily. The difference from Deno is that it supports TSX and JSX too.

Package Manager

Bun has a centralized package manager that is functioning faster than the NPM. It is using the compatible NodeJS module algorithm that can be used with safe NPM packaging.

Built-In Test Runner

Deno is having the native test runner able to run integration tests way quicker than other dependencies across Node JS. Bun is also ensuring the test run as per relevant use and thus uses the latest version of JavaScript runtime for the best results. 

The Final Talk!

The primary goal of Deno is not to replace Node JS but to provide an efficient alternative. It is similar to the comparison of Deno vs Bun and the developer should make the final selection based on the present requirements.

Selection of the Bun will always be a challenge as it is the newer version and thus the chances of bugs or compatibility issues remain. But, Bun looks promising due to its development with Zig and looks like the technology to keep an eye on. 

If you desire to get a faster runtime environment select Bun which has a complete set of tools for compilation. But, if you want to stick to the V8 engine and are looking for something better than Node JS then Deno is the best call.