Dev iconDevSep 4, 2026 ~1 min source read

How I built a live code editor

Editor From Scratch (With Raw JS) рџљЂTags: #webdev #javascript #beginners #showdevThe Motivation рџ'ЎHey DEV Community! It splits the screen into two main sections:The Input Pane: A where you type your code.The Output Pane:

How I built a live code editor
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Editor From Scratch (With Raw JS) рџљЂTags: #webdev #javascript #beginners #showdevThe Motivation рџ'ЎHey DEV Community!

It splits the screen into two main sections:The Input Pane: A where you type your code.The Output Pane:

An that acts as an isolated sandbox environment.The magic happens in the JavaScript.

Building the complete brief

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The useful part

Editor From Scratch (With Raw JS) рџљЂTags: #webdev #javascript #beginners #showdevThe Motivation рџ'ЎHey DEV Community! It splits the screen into two main sections:The Input Pane: A where you type your code.The Output Pane: An that acts as an isolated sandbox environment.The magic happens in the JavaScript.

How it works

  • Every single time a key is pressed, JavaScript grabs the string value and uses.write() to dynamically inject it straight into the iframe's document layout.рџ"„ The Source Code1.
  • index.htmlhtml Live Code Editor рџђ¦ Adenola Tech Editor Type your HTML/CSS code below to see it live Source Code Input <textarea id="code-input" placeholder="Type HTML her...

Details worth keeping

I wanted to share my latest personal project. I added an input event listener to the textarea.

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