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Alex Spinov
Alex Spinov

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Deno 2 Has a Free Runtime — Node.js Compatibility Without node_modules

#deno #javascript #typescript #webdev

Deno 2 Finally Fixed the Compatibility Problem

Deno 1 was brilliant but impractical. You could not use npm packages. The ecosystem was tiny. Nobody shipped production apps on it.

Deno 2 changed everything. Full npm compatibility. node_modules support. Drop-in Node.js replacement.

What Deno 2 Gives You

Native TypeScript 

# No tsconfig. No ts-node. No build step.
deno run app.ts
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TypeScript just works. Always has in Deno.

npm Packages Work 

import express from 'npm:express'

const app = express()
app.get('/', (req, res) => res.send('Hello from Deno!'))
app.listen(3000)
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Prefix with npm: and it works. No npm install. No node_modules folder (unless you want one).

Built-in Tools 

deno fmt          # Format (like Prettier)
deno lint         # Lint (like ESLint)  
deno test         # Test runner (like Jest)
deno bench        # Benchmarks
deno compile      # Compile to single binary
deno jupyter      # Jupyter notebook kernel
deno doc          # Generate docs
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No dev dependencies. No config files. It is all built in.

Security by Default 

# This FAILS — no network access by default
deno run app.ts
# Error: Requires net access to "0.0.0.0:3000"

# Explicitly grant permissions
deno run --allow-net --allow-read app.ts
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No random npm package can steal your SSH keys or exfiltrate env variables. You must explicitly allow file, network, and environment access.

Deno Deploy (Edge Hosting) 

deno deploy --project=my-app main.ts
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Deploy to 35+ edge locations worldwide. Free tier includes:

  • 1M requests/month
  • 100GB bandwidth
  • KV storage included
  • Cron jobs included

Compile to Single Binary 

deno compile --allow-net --allow-read server.ts
# Creates: ./server (single executable)
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Distribute your app as one file. No runtime needed. Runs on macOS, Linux, Windows.

Deno vs Node.js vs Bun in 2026

Feature Deno 2 Node.js 22 Bun
TypeScript Native Via ts-node Native
Security Permissions None None
Package manager Built-in npm/pnpm/yarn bun
Test runner Built-in --test flag Built-in
Formatter Built-in Prettier No
Linter Built-in ESLint No
npm compat Full Native Full
Compile to binary Yes Yes (SEA) Yes
Deploy platform Deno Deploy Many No

When to Use Deno 2

  • New projects where you want everything built-in
  • Security-sensitive code (permissions model)
  • Edge deployment (Deno Deploy is excellent)
  • Scripts and tools (compile to single binary)

When to Stay on Node.js

  • Existing large codebase (migration cost)
  • Specific Node.js native addons (C++ modules)
  • Team familiarity trumps technical advantages

Install 

curl -fsSL https://deno.land/install.sh | sh
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Building scripts that need web data? 88+ scrapers on Apify. Custom solutions: spinov001@gmail.com

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