Js1k

JS1K was an annual JavaScript programming competition that challenged developers to create small, creative web applications using no more than 1 kilobyte (1024 bytes) of JavaScript code. Running from 2010 to 2019, the contest became a showcase for ingenuity in minimalist programming and a celebration of technical creativity within the constraints of browser-based development.

Format

Each edition of JS1K imposed a strict limit of 1024 bytes of JavaScript code with a “no externals” rule: all entries had to be entirely self-contained using only standard web APIs (mainly vanilla JavaScript and HTML5 features) without any external resources or libraries. A basic HTML environment, including a `

` element, was provided for rendering, and the use of heavier technologies such as WebGL was initially disallowed to maintain cross-browser compatibility.

Entries had to run directly in major web browsers like Google Chrome, Mozilla Firefox, and Opera.

Themes

Each year featured an optional theme—such as “Love” (2012), “Dragons” (2014), or “Magic” (2017)—that guided participants’ creativity. For example, the 2013 theme, “Spring,” inspired floral animations and physics-based interactive demos. While themes encouraged artistic cohesion, off-theme submissions were accepted as long as they adhered to the 1K limit.

Notable Entries and Impact

Despite the extreme size constraint, participants regularly produced advanced visual and interactive projects—some achieving 3D rendering, particle systems, or full mini-games within the 1K limit. Notable entries included:

  • a spinning 3D globe displaying the user’s position,
  • a smooth playable space shooter called 1K Meteors,
  • mini-implementations of Pac-Man and Conway’s Game of Life,
  • and a 2014 recreation of Minecraft-like voxel terrain in just 1024 bytes of code.

The 2014 winning entry, DragonDrop, featured an interactive 3D crystal dragon that users could manipulate in real time.

See also

  • Code golf
  • Demoscene
  • JavaScript
  • Creative coding

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