Web.config Validator Tool

Validate your web.config files for syntax errors, common mistakes, and security issues with our advanced validation tool.

Validate Your Web.config

Validation Results

Your validation results will appear here after submission.

Advanced Features

✓

Syntax Validation

Check for XML syntax errors, malformed tags, and improper nesting.

⚡

Common Error Detection

Identify frequent configuration mistakes that cause application issues.

🔒

Security Analysis

Detect potential security vulnerabilities in your configuration.

How It Works

Paste or Upload

Paste your web.config content or upload the file directly.

Validate

Our tool checks for errors and potential issues.

Review Results

Get detailed feedback with explanations and fixes.

Frequently Asked Questions

What is a web.config file? +

The web.config is a XML-based configuration file used in ASP.NET applications to manage various settings that govern the behavior of the web application.

What are common web.config errors? +

Common errors include malformed XML, incorrect section grouping, duplicate sections, invalid attribute values, and permission issues.

Is my data secure when using this validator? +

Yes, all validation is performed client-side in your browser. Your configuration data never leaves your computer.

Ready to validate your web.config?

Ensure your ASP.NET application runs smoothly with a properly configured web.config file.

Common Web.config Errors and How to Fix Them

Web.config files are essential for ASP.NET applications, but they can be a source of frustration when errors occur. Here are some of the most common issues:

1. XML Syntax Errors

Malformed XML is the most common issue. Always ensure your tags are properly closed and nested. Use our validator to check for syntax issues.

2. Configuration Section Errors

Sections must be declared in the correct order and properly grouped. The configSections element must be the first child of the configuration element.

3. Duplicate Sections

Having duplicate configuration sections will cause runtime errors. Our validator can detect these duplicates.

4. Invalid Attribute Values

Many configuration elements have specific value requirements. Our tool checks these values against the expected formats.

Using a validator like ours can help you identify and fix these issues before they cause problems in production.