mathiasbynens/mothereff.in

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1114 stars · 311 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A collection of small web-based developer tools (validators, generators, and converters) for HTML, CSS, JavaScript, and encoding tasks, served as single self-contained HTML pages. It includes utilities like entity/URL/Base64 encoders, JavaScript variable name validators, and Punycode converters.

Use cases

• encode or decode HTML entities, URLs, Base64, or UTF-8 strings
• validate JavaScript variable or property names
• convert internationalized domain names to Punycode
• check HTML for ambiguous ampersands or unquoted attribute values
• escape strings for embedding in JavaScript or CSS
• count string length in UTF-8 bytes

When to choose

• you need quick, no-install browser tools for encoding, escaping, or validating web code snippets
• you want offline-capable single-file utilities
• you need a reference implementation for tricky web platform edge cases

When to avoid

• you need a programmable API or CLI for automation
• you need heavy-duty or batch processing of large files
• you need actively developed tooling with modern framework support

Facets

application · maturity maintenance

developer-tools serialization parser internationalization developer-tools web-development frontend browser web-developer-tools encoder-decoder validators converters single-page-tools web-server javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="mathiasbynens/mothereff.in")