Nginx Config Validator
Validate Nginx configuration syntax, reverse proxy rules, and SSL security
Free in-browser Nginx configuration validator and linter. Detect syntax errors, unclosed braces, missing semicolons, deprecated TLS protocols, and common reverse proxy misconfigurations with zero server uploads.
Keywords: nginx, validator, linter, syntax check, reverse proxy, devops, webserver, ssl, hsts
Tags: nginx, linter, validator, devops, sysadmin, webserver, ssl, reverse-proxy, security
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Nginx Config Validator is also known as: nginx validator, nginx linter, nginx config checker, nginx syntax checker, online nginx tester.
How to Nginx Config Validator Online
Paste your Nginx configuration (nginx.conf or sites-available/*.conf) into the editor or select a standard reverse proxy example.
Toggle security checks to enable automated auditing for deprecated TLS protocols, missing HSTS, and clickjacking protection headers.
Inspect real-time syntax errors, unclosed curly braces, and missing semicolons with line-numbered annotations.
Review the Nginx Health Score and actionable suggestions for proxy_pass trailing slashes and alias path traversal risks.
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.
Pre-built Automation Pipelines
Chain Nginx Config Validator with other utilities in a multi-step visual workflow.
Base64 Decode → JSON Format
Decode a Base64 string and pretty-print the JSON inside it.
CSV → JSON → YAML
Convert CSV data to JSON, then to YAML format.
JSON Format → TypeScript Schema
Format JSON and generate TypeScript/Zod schema from it.
Example Input & Output
Sample ReferenceInteractive Example: Nginx Config Validator in ActionShow example
Sample Input (text)
server {
listen 80;
server_name example.com www.example.com;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl http2;
server_name example.com;
ssl_certificate /etc/ssl/certs/example.crt;
ssl_certificate_key /etc/ssl/private/example.key;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers HIGH:!aNULL:!MD5;
add_header X-Frame-Options "DENY" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
location / {
proxy_pass http://127.0.0.1:3000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}Sample Output
[Processed output for Nginx Config Validator]
Input transformed successfully using nginx, validator, linter.What happened:
Validate Nginx configuration syntax, reverse proxy rules, and SSL security
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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