NPM Version Badge Generator - Online Shields Style
Pick a package name and generate a custom version or download badge as a static image or Markdown link. For readme files.
UD5 Toolkit
Pick a package name and generate a custom version or download badge as a static image or Markdown link. For readme files.
Write and run simple Sinclair BASIC programs in a browser-based ZX Spectrum emulator. Load demo programs and experience 80s computing. Educational fun.
Write slides in Markdown and instantly preview a webβbased presentation. Export as HTML. Pure frontend.
Fill in your PWA details to generate a valid manifest.json file. Include icons, theme color, display mode.
Configure how your PWA launches: focus existing or create new. Test with the launch_handler manifest field.
Bypass CORS for testing by routing requests through a local service worker proxy. Debug APIs without server changes. Experimental.
Upload a 512x512 logo and get resized icons for every PWA requirement. Download a zip and the corresponding manifest.json snippet.
Test SQL injection inputs on a mock database and see the resulting query. Learn how to prevent SQLi. No real data.
Paste your manifest.json and instantly validate it against the W3C spec. Catch errors and warnings. Clientβside.
Derive a strong cryptographic key from a password using PBKDF2 with SHAβ256. Adjust iterations and salt. Educational and test tool.
Check if your related native or PWA app is installed. See the API in action and copy the code.
Fold a virtual square paper step by step with crease lines and visual previews. Practice origami basics without wasting real paper. All canvasβbased.
Generate a series of semantic version tags with optional prefixes. Copy for your release script. Consistent tagging.
Learn how to register your PWA to handle custom URL protocols. See the manifest entry and test.
Validate and compare semantic version strings. Check if a version satisfies a range (e.g., ^1.2.3). Visual breakdown of major.minor.patch. Local only.
Paste a GraphQL SDL schema and get autoβgenerated Markdown documentation. Perfect for API docs. All local.
Paste your Swagger/OpenAPI YAML and see a rendered API documentation preview with expandable endpoints. All local rendering.
Generate a dummy RSA or EC public/private key pair for educational visualization. Shows key structure and ASN.1 dump. Not for production use.
Paste JSON-LD and validate basic syntax and required properties for Article, Product, etc. Local only. Instant feedback.
Parse XML strings into compact JSON representation. Handles attributes and text nodes intelligently. Quick and private, ideal for API response translation.
Paste a GeoJSON object and validate its structure. Catch missing coordinates, wrong types, and feature errors. Local.
Paste your .htaccess rules and check for common syntax errors or misconfigurations. No server required; static analysis.
Translate YAML configuration files into JSON format instantly. Validate syntax during conversion. Perfect for DevOps and configuration management. Secure client-side operation.
See how Trusted Types prevents unsafe HTML assignment. Test against injected scripts. Modern security practice.
Paste two Markdown texts and see a sideβbyβside diff with rendered preview. Perfect for editing and collaboration.
Validate if a version string follows SemVer 2.0.0. Also sort and compare versions. Developer tool.
Move your mouse or finger to create colorful paint splatters on canvas. Great stress reliever. Download as PNG.
Load a sprite sheet, define frames, and play an animation on a canvas. Control frame rate and loop. Game dev tool.
Paste HTML/CSS and render it to a canvas image. Download as PNG. For creating dynamic social share images.
Upload a small image and see it tiled as a canvas pattern. Export the pattern or copy the JavaScript.