Netlify Security Best Practices
Secure your Netlify deployments with these essential practices. From environment variables to Edge Functions security.
Verify your app follows these best practices automatically.
Netlify handles infrastructure security, but application security is your responsibility. These practices help you deploy securely on Netlify.
Quick Wins
Security Best Practices
#1Use Environment Variables for Secrets
criticalNever commit secrets to your repository. Use Netlify's environment variable management.
Implementation
Add secrets in Netlify Dashboard → Site Settings → Environment Variables
#2Scope Variables to Deploy Contexts
criticalUse different secrets for Production, Deploy Preview, and Branch Deploy contexts.
Implementation
Configure context-specific values in Site Settings → Environment Variables
#3Secure Netlify Functions
highValidate authentication and authorization in every serverless function.
Implementation
Check JWT/session validity and user permissions at function start
#4Configure Security Headers
highAdd CSP, HSTS, and other security headers via _headers file or netlify.toml.
Implementation
Create _headers file in publish directory or add headers to netlify.toml
#5Protect Deploy Previews
highDeploy previews are public by default. Add protection for sensitive sites.
Implementation
Use password protection or identity-based access control
#6Enable Netlify Graph Security
mediumIf using Netlify Graph, restrict which APIs are accessible and validate requests.
Implementation
Configure allowed operations and validate caller identity
Common Mistakes to Avoid
Same environment variables in all contexts
Exposes production secrets in previews
Use context-specific values for sensitive variables
Missing auth in Netlify Functions
Anyone with the URL can call your functions
Validate authentication at the start of every function
Public deploy previews
Preview URLs can leak unreleased features or test data
Enable access control for deploy previews
Verify Your Netlify 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
Are my environment variables secure on Netlify?
Yes, Netlify encrypts environment variables and only exposes them to your build and functions. They're not visible in logs or client-side code.
How do I add security headers on Netlify?
Create a _headers file in your publish directory with headers like Content-Security-Policy, or add headers configuration to netlify.toml.
Can deploy previews access production data?
Only if you configure them to. Use context-specific environment variables to ensure previews use staging/test resources.
Related Netlify Security Resources
Last updated: January 2026