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How to Nginx Config Validator Online

1. 1

   Paste your Nginx configuration (nginx.conf or sites-available/*.conf) into the editor or select a standard reverse proxy example.

2. 2

   Toggle security checks to enable automated auditing for deprecated TLS protocols, missing HSTS, and clickjacking protection headers.

3. 3

   Inspect real-time syntax errors, unclosed curly braces, and missing semicolons with line-numbered annotations.

4. 4

   Review the Nginx Health Score and actionable suggestions for proxy_pass trailing slashes and alias path traversal risks.

5. 5

   Copy the JSON validation report or export the clean configuration for immediate deployment in production.

Nginx Config Validator Features

• ✓

  Real-time Nginx Syntax Validation: Detects unbalanced braces, missing semicolons, and invalid directives without needing a running nginx daemon.

• ✓

  SSL/TLS Security Audit: Flags deprecated TLSv1.0 and TLSv1.1 protocols and enforces modern TLSv1.2 and TLSv1.3 configurations.

• ✓

  HTTP Security Headers Check: Analyzes presence of Strict-Transport-Security (HSTS), X-Frame-Options, and X-Content-Type-Options headers.

• ✓

  Reverse Proxy Pitfall Detection: Highlights URI replacement subtleties in proxy_pass and path traversal vulnerabilities in alias directives.

• ✓

  Health Scoring: Generates a 0-100 configuration health benchmark with categorised errors, warnings, and informational notices.

• ✓

  Zero Server Upload: 100% in-browser client-side execution ensures production IP addresses, internal domains, and upstream topology never leave your device.

Frequently Asked Questions

How do I check if my Nginx configuration syntax is valid online?

Paste your nginx.conf or site block into the DevFlow Nginx Config Validator. The tool performs real-time static syntax analysis, validating block structure, semicolon termination, and directive parameters directly in your browser without requiring root terminal access.

Why does nginx -t test pass on server but this validator flags warnings?

The standard "nginx -t" command checks basic syntax that prevents startup. Our validator performs both syntax validation and static security auditing, flagging insecure TLS versions, missing HTTP security headers, and subtle proxy_pass behavior that nginx -t ignores.

What is the danger of missing a trailing slash in an Nginx alias directive?

When using "location /static" with "alias /var/www/static", if both do not share matching trailing slashes, an attacker can request "/static../secret.txt" to traverse directories outside the intended folder. The validator flags this common misconfiguration.

Are my internal server names or upstream IPs uploaded to DevFlow?

No. DevFlow processes your configuration entirely client-side in the browser. Zero bytes are transmitted to any remote server.

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