Developers

Built for developers. Operated by security teams.

Simple REST APIs, clear documentation, and a console designed for both developers and security operators.

curlNode.jsPythonGo

Resources

Everything you need to integrate

curlNode.jsPythonGo

Use with AI: Cursor, Claude Code, Codex

Copy one prompt into Cursor, Claude Code, or Codex and ship breached-password screening in minutes.

Get from zero to breached-password screening in under 10 minutes.

Complete REST API documentation with request/response schemas and examples.

Policy Outcomes

Learn how to configure block, step-up, force reset, and notify policies.

Receive real-time notifications for exposure alerts and policy events.

Status & Changelog

System status, uptime history, and a log of API changes and updates.

How it works

One API call. That's it.

Hash the password on your side, send the first 5 characters of the SHA-1 hash, and compare locally.

$ echo $PASSWORD_HASH
5BAA6
$ curl -s https://api.leakjar.com/v1/passwords/range/$PASSWORD_HASH \
    -H "Authorization: Bearer lj_..."
200 OK — text/plain, 847 lines of SUFFIX:COUNT
# Compare full hash locally to check for a match

Console

Manage everything from the console

API keys, project settings, usage analytics, and audit logs — all in one place.

Build with AI

Vibe-code it in two steps

Grab a free key (10,000 checks/month, no card), paste our prompt into Cursor, Claude Code, or Codex, and let your agent wire up breached-password screening. Agents read /llms.txt for the exact contract.

Get the AI prompt View /llms.txt

Start building today

Sign up for a free account and integrate breached password screening in minutes.

Open the Console Read the Quickstart