# mathiasbynens/mothereff.in

Web developer tools

Repository: https://github.com/mathiasbynens/mothereff.in
Canonical: https://ross.abutalabs.com/products/mothereffin
Homepage: https://mothereff.in/
Language: JavaScript
License: GPL-2.0
License Family: copyleft
Last push: 2024-07-10T12:22:06+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5402, "days_push": 784, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1114, forks 311 (observed 2026-08-28T04:03:38.152209+00:00)

## What it is
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
- artifact type: application
- maturity: maintenance
- function: developer-tools, serialization, parser, internationalization
- domain: developer-tools, web-development, frontend
- platform: browser
- tags: web-developer-tools, encoder-decoder, validators, converters, single-page-tools, web-server, javascript

## Member repositories
- mathiasbynens/mothereff.in (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:38.152209+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:42:31.573829+00:00, confidence not recorded.
  - readme: https://github.com/mathiasbynens/mothereff.in (fetched 2026-08-28T04:03:38.152209+00:00, sha e589ef1d7404)
  - homepage: https://mothereff.in/ (fetched 2026-08-29T12:46:11.524014+00:00, sha 0f323df3f2c0)
- Data as of 2026-08-30T08:39:29.467469+00:00.