Nginx Config Validator

What Does This Validator Check?

• Balanced braces — every { must have a matching }
• Semicolons — every directive must end with ;
• Unknown directives — checks against a list of common Nginx directives
• Missing server_name — warns if a server block has no server_name
• Duplicate listen — warns if same port is listened on twice
• SSL configuration — checks for common SSL misconfigurations

What Is Nginx Config Validation?

Nginx configuration validation is the process of checking Nginx configuration files for syntax errors, structural issues, and common misconfigurations before deploying them to production servers. Nginx uses a block-based configuration syntax where directives are organized inside server, location, and upstream blocks. A missing semicolon, unbalanced brace, or incorrect directive name can cause Nginx to fail to start or behave unexpectedly. This tool checks for balanced braces, proper semicolon termination, valid directives, missing server_name warnings, duplicate listen ports, and SSL configuration issues. It helps DevOps engineers and system administrators catch errors early in the development workflow, reducing downtime and configuration-related incidents.

How to Use This Tool

1. Paste your Nginx configuration — Enter or paste your full nginx.conf or site configuration into the input area.
2. Click Validate — The tool checks for syntax errors, unbalanced braces, missing semicolons, and known directive issues.
3. Review results — Errors and warnings are displayed with line numbers and descriptions.
4. Fix and revalidate — Correct any issues and validate again until your configuration passes.
5. Use examples — Click the example buttons (Server, Reverse Proxy, SSL, Has Errors) to see sample configurations and how validation works.

Frequently Asked Questions