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URL Parameters

MistWarp supports URL parameters that let you load projects and adjust runtime and compiler behavior. These are useful for embedding, automation, and sharing reproducible setups.

Basic Usage​

URL Parameter Syntax​

Add parameters using standard query string format:

https://warp.mistium.com/?parameter1&parameter2=value&parameter3=value

Multiple Parameters​

Combine multiple parameters with &:

https://warp.mistium.com/?turbo&fps=60&username=alice&autoplay

Project Loading​

Load by ID​

Load a Scratch project by its ID:

https://warp.mistium.com/123456789

Load from URL​

Load a project from a direct URL:

https://warp.mistium.com/?project_url=https://example.com/project.sb3

Auto-start (embed only)​

Automatically start the project in embeds:

https://warp.mistium.com/123456789?autoplay

Username​

Set the username used by cloud variables and blocks:

https://warp.mistium.com/123456789?username=alice

Performance​

Turbo Mode​

Enable high-speed execution:

https://warp.mistium.com/?turbo

Frame Rate​

Set custom frame rate:

https://warp.mistium.com/?fps=60     # 60 FPS
https://warp.mistium.com/?fps=120    # 120 FPS
https://warp.mistium.com/?fps=30     # 30 FPS (default)

High Quality Pen​

Enable anti-aliased pen rendering:

https://warp.mistium.com/?hqpen

Interpolation​

Enable frame interpolation for smoother motion:

https://warp.mistium.com/?interpolate

Remove Misc Limits​

Disable certain runtime limits:

https://warp.mistium.com/?limitless

Display​

Custom Stage Size​

Set custom stage dimensions:

https://warp.mistium.com/?size=800x600
https://warp.mistium.com/?size=1920x1080

Fullscreen Background (player-only)​

Control fullscreen background color:

https://warp.mistium.com/?fullscreen-background=%23abc123

Offscreen Fencing​

Disable offscreen fencing:

https://warp.mistium.com/?offscreen

Clone Limit​

Set maximum clones:

https://warp.mistium.com/?clones=300

Extensions​

Load Extensions​

Load custom extensions by URL (unsandboxed recommended):

https://warp.mistium.com/?extension=https://example.com/ext.js
https://warp.mistium.com/?extension=https://example.com/other.js

Addons (embed only)​

Enable specific addons in embeds:

https://warp.mistium.com/123456789/embed?addons=pause,gamepad

Embedding​

Autoplay and Addons​

Embed-specific options:

https://warp.mistium.com/123456789/embed?autoplay
https://warp.mistium.com/123456789/embed?addons=pause,gamepad

Development​

Disable Compiler​

Turn off the compiler (for debugging):

https://warp.mistium.com/?nocompile

Project URL​

Load project data from a direct URL:

https://warp.mistium.com/?project_url=https://example.com/project.sb3

Cloud Host (embed/player)​

Override cloud server:

https://warp.mistium.com/?cloud_host=wss://clouddata.turbowarp.org

Reference​

Complete Parameter Reference​

Performance​

ParameterValuesDescription
turbobooleanEnable turbo mode
fpsnumberSet frame rate
hqpenbooleanHigh quality pen
interpolatebooleanEnable interpolation
limitlessbooleanDisable misc limits
stuckbooleanEnable warp timer (player-only)

Display​

ParameterValuesDescription
sizeWIDTHxHEIGHTCustom stage size
fullscreen-backgroundCSS colorFullscreen background color
offscreenbooleanDisable offscreen fencing

Project​

ParameterValuesDescription
usernamestringUsername
project_urlURLLoad from URL

Extensions​

ParameterValuesDescription
extensionURLLoad extension by URL

Development​

ParameterValuesDescription
nocompilebooleanDisable compiler
cloud_hostwss://...Custom cloud host

URL Parameter Examples​

Gaming Setup​

Optimized for games:

https://warp.mistium.com/123456789?turbo&fps=60&interpolate

Educational Embedding​

Clean embed for education:

https://warp.mistium.com/123456789/embed?autoplay&size=800x600

Development Testing​

Development environment:

https://warp.mistium.com/?turbo&fps=120&hqpen

High Performance​

Maximum performance:

https://warp.mistium.com/?turbo&fps=120&hqpen

Accessible Mode​

Use OS/browser accessibility features. Theme is controlled in the UI, not via URL.

URL Encoding​

Special Characters​

Encode special characters in URLs:

Space: %20
#: %23
&: %26
=: %3D

Example with Encoding​

https://warp.mistium.com/?fps=60&hqpen

JavaScript URL Manipulation​

Reading Parameters​

const urlParams = new URLSearchParams(window.location.search);
const turboMode = urlParams.has('turbo');
const fps = urlParams.get('fps') || '30';

Setting Parameters​

const url = new URL(window.location);
url.searchParams.set('fps', '60');
url.searchParams.set('turbo', '');
window.history.pushState({}, '', url);

Building URLs Programmatically​

function buildMistWarpURL(projectId, options = {}) {
  const url = new URL(`https://warp.mistium.com/${projectId}`);
  
  Object.entries(options).forEach(([key, value]) => {
    if (value === true) {
      url.searchParams.set(key, '');
    } else if (value !== false && value !== null) {
      url.searchParams.set(key, value);
    }
  });
  
  return url.toString();
}

// Usage
const gameURL = buildMistWarpURL('123456789', {
  turbo: true,
  fps: 60,
  interpolate: true
});

Best Practices​

URL Length​

  • Keep URLs reasonable length (under 2000 characters)
  • Use essential parameters only
  • Consider using short parameter names

User Experience​

  • Provide sensible defaults
  • Use autoplay sparingly
  • Test URLs thoroughly

Performance​

  • Combine compatible performance parameters
  • Test performance impact of parameter combinations
  • Monitor for conflicts between parameters

URL parameters provide powerful customization capabilities for MistWarp. Use them to create tailored experiences for different users and use cases!