Password Strength Checker API — Evaluate Password Security

Identity Validation ⏱ 1 min read

Password Strength Checker API — Evaluate Password Security in Real-Time

Check password strength with entropy calculation, common password detection, character set analysis, and length scoring. Get actionable feedback to improve password security. Free API.

What is Password Strength Checking?

Password strength checking evaluates how resistant a password is to guessing and brute-force attacks. The API checks minimum length, character variety (uppercase, lowercase, digits, symbols), entropy, repetition patterns, and compares against common password lists. Returns a score from 0-100 with specific improvement suggestions.

How to Use It

Call GET /api/v1/password-strength?password=MyP@ss123. Returns { score: number, strength: string, entropy: number, length: number, has_upper: boolean, has_lower: boolean, has_digit: boolean, has_symbol: boolean, common_password: boolean, feedback: string[] }.

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Frequently Asked Questions

What is a good password strength score?

Scores above 80 are considered strong. Scores 60-80 are moderate. Below 60 is weak and should be improved. A score of 100 indicates maximum security characteristics.

Does the API check against known breach lists?

The API checks against common password lists but not full breach databases. For breach checking, use dedicated services like Have I Been Pwned.