dropbox/zxcvbn
Low-Budget Password Strength Estimation observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5300
- days_rel: n/a
- days_push: 744
- n_releases_24m: 0
Adoption not part of the score
16037 stars · 996 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
zxcvbn is a JavaScript password strength estimator inspired by password crackers, using pattern matching and conservative estimation against common passwords, words, dates, keyboard patterns, and l33t speak. It provides realistic guessability scores plus targeted verbal feedback as an alternative to rigid password composition rules.
Use cases
- estimate password strength realistically in a signup form
- replace password composition rules with a complexity score
- give users instant feedback on weak passwords
- detect common passwords and keyboard patterns like qwerty
- score passphrase strength based on word rarity
When to choose
- you need client-side password strength metering with no server round-trip
- you want to replace LUDS composition policies with a research-backed estimator
When to avoid
- you need server-side strength checks in a non-JavaScript stack without a port
- you need cryptographic key-strength validation rather than user-facing feedback
Facets
library · maturity maintenance
security auth security web-development browser cross-platform password-strength entropy-estimation coffeescript nodejs
4 sources
- readme: https://github.com/dropbox/zxcvbn · fetched 2026-08-28 · 08f0e2c647ee
- homepage: https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/wheeler · fetched 2026-08-29 · 6c9afd83b807
- registry_npm: https://registry.npmjs.org/zxcvbn · fetched 2026-08-29 · dac7580b9dd1
- site_page: https://www.usenix.org/conference/usenixsecurity16/symposium-organizers · fetched 2026-08-29 · 916468c9b120
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| dropbox/zxcvbn | main | 23 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem