Stripe Secret Key Scanner: Find Leaked Keys in Your Next.js App

Quick answer

A Stripe secret key scanner is a tool that searches your codebase, environment variables, and git history for exposed Stripe secret keys (sk_live_ or sk_test_). For vibe-coded Next.js apps built with AI tools like Cursor, Bolt.new, or v0, leaked keys often hide in .env files, client-side bundles, or hardcoded in components. Run a scanner immediately after your AI generates code, and set up automated scanning in your CI/CD pipeline.

What to check first

Before deploying your vibe-coded Next.js app, audit these common leak points:

Step-by-step fix

Follow these steps to scan and fix leaked Stripe secret keys in your vibe-coded Next.js app.

Step 1: Scan your codebase with a Stripe secret key scanner

Use a dedicated Stripe secret key scanner like the secret leak scanner from OverMCP. This tool checks your entire project, including git history and common config files.

# Example using OverMCP CLI (if available)
npx overmcp scan --pattern "sk_live_*"
# Or use the web tool: paste your repo URL or upload a file

Alternatively, use grep manually:

grep -r "sk_live_" . --include="*.{js,ts,jsx,tsx,json,env}" --exclude-dir=node_modules

Step 2: Rotate the compromised key

If you find a leaked key, go to the Stripe Dashboard and roll the key immediately. Create a new secret key and update your environment variables.

Step 3: Remove the key from your codebase

Delete any hardcoded keys from source files. Move secrets to environment variables:

// pages/api/charge.ts (before - insecure)
const stripe = new Stripe('sk_live_abc123');

// After - secure
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

Step 4: Update `.gitignore`

Ensure .env* files are ignored:

# .gitignore
.env
.env.local
.env.production
.env.*.local

Step 5: Purge git history (if committed)

If the key was committed, use git filter-branch or BFG Repo-Cleaner to remove it from history. Then force push to overwrite remote.

Step 6: Set up continuous monitoring

Prevent future leaks by adding automated scanning. OverMCP offers continuous security monitoring that scans every commit and deployment for exposed secrets.

Common mistakes

Vibe-coded apps often make these errors:

How OverMCP helps

OverMCP’s free AI app security scanner automatically detects leaked Stripe secret keys and other secrets in your vibe-coded Next.js app. It integrates with your git workflow and provides real-time alerts when secrets are exposed. Run it before every deploy to catch leaks early.

FAQ

How do I know if my Stripe secret key is leaked?

Use a Stripe secret key scanner like OverMCP’s secret leak scanner or grep your codebase for sk_live_. Also check public GitHub repos and pastebin-like sites. If you suspect a leak, rotate the key immediately.

Can I use `grep` to find Stripe keys in my Next.js app?

Yes. Run grep -r "sk_live_" . --include="*.{js,ts,jsx,tsx,env}" --exclude-dir=node_modules. This will find any hardcoded secret keys. For a more thorough scan including git history and compressed files, use a dedicated scanner.

What should I do if my Stripe secret key is exposed?