Bolt.new Security Best Practices
Secure your Bolt.new application with these essential practices. From secrets management to deployment security.
Verify your app follows these best practices automatically.
Bolt.new enables rapid prototyping in the browser, but production apps need security hardening. Follow these practices to ship secure applications.
Quick Wins
Security Best Practices
#1Move All Secrets to Environment Variables
criticalBolt projects often have secrets in code for quick testing. Before deploying, move all API keys and credentials to environment variables.
Implementation
Use your deployment platform's environment variable settings (Vercel, Netlify, etc.)
#2Review AI-Generated API Routes
criticalCheck all server-side code for proper authentication and authorization. AI often creates functional but insecure endpoints.
Implementation
Audit each API route for auth checks and user-scoped data access
#3Implement Proper Error Handling
highReplace development error messages with generic production errors. Don't leak stack traces or internal details.
Implementation
Create a central error handler that logs details server-side but returns generic messages to clients
#4Add Rate Limiting
highProtect public endpoints from abuse with rate limiting. This is often missing in AI-generated code.
Implementation
Use rate limiting middleware like express-rate-limit or upstash/ratelimit
#5Validate All User Input
highNever trust data from users. Validate type, length, and format on the server.
Implementation
Use validation libraries like Zod or Yup for type-safe input validation
#6Configure Security Headers
mediumAdd CSP, HSTS, and other security headers to protect against common web attacks.
Implementation
Configure headers in your deployment platform or application config
Common Mistakes to Avoid
Deploying with development secrets
Test API keys may have higher limits or different permissions than intended
Create separate production credentials and use environment variables
Exposing internal error details
Stack traces reveal file paths, package versions, and code structure
Implement production error handling that logs internally but returns generic messages
Missing input validation
Allows injection attacks and data corruption
Validate all user input on the server with a schema validation library
Verify Your Bolt.new App Security
Following best practices is the first step. Verify your app is actually secure with a comprehensive security scan.
Get Starter ScanFrequently Asked Questions
How do I add environment variables to my Bolt project?
When you deploy from Bolt to platforms like Vercel or Netlify, use their dashboard to add environment variables. Never commit secrets to the exported code.
Should I review all the code Bolt generates?
Focus on reviewing security-critical code: authentication, authorization, database queries, and API endpoints. You don't need to review every line, but these areas need human oversight.
How do I know if my Bolt app is secure enough to launch?
Run a security scan to check for common issues. At minimum, verify: secrets are in environment variables, authentication works correctly, users can only access their own data, and HTTPS is enforced.
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Last updated: January 2026