Front-end and web plumbing

Percent-encode or decode text and URLs, component-wise or whole, all local.

Break a URL into protocol, host, path, query parameters and fragment, locally.

Build a URL query string from JSON parameters and parse one back to JSON, locally.

Look up HTTP status codes and MIME types with quick search, all local reference.

Validate YAML, Docker Compose and Kubernetes manifests for structure and common mistakes, locally.

Explore an OpenAPI/Swagger spec (JSON or YAML) and generate C# models from its schemas, locally.

Format JavaScript, TypeScript, CSS, SCSS, HTML, JSON, YAML and Markdown with Prettier, locally.

Convert colors between hex, rgb(a) and hsl(a), with a live swatch, locally.

Break a User-Agent string into browser, engine, OS and device, locally.

Generate SEO, OpenGraph and Twitter meta tags from a few fields, locally.

Turn text into a clean, URL-safe slug, stripping accents and punctuation, locally.

Reduce emails to a canonical form (Gmail dots and +tags) to spot duplicates, locally.

Unwrap Outlook SafeLinks and similar redirect URLs to reveal the real destination, locally.

Press any key to see its JavaScript event.key, code, keyCode and modifiers, locally.

Write rich text with a toolbar and get clean HTML out, locally.

See what your browser exposes: screen, viewport, platform, languages and more, locally.