Online JSP Validator

The validator analyzes JSP source code to detect syntax errors, tag balance issues, and common JSP pitfalls without compiling or executing the page. It focuses on translation-time errors that typically surface during deployment or unit tests, helping teams identify issues earlier in the development lifecycle and reduce debug cycles.
Core logic includes a tokenizer that separates static HTML from JSP expressions, scriptlets, and directives, then applies formal rules for matching tags, valid directive usage, attribute syntax, and proper include/forward usage. Required features: line-accurate error reporting, structured output, and clear messages. Optional/advanced features: detection of deprecated scriptlet usage, linting of tag library references, and recommendations to replace scriptlets with expression language or JSTL. Outputs are designed for automation (JSON) and human readability.
Outputs structure a validation report with error and warning arrays, each item containing line numbers, severity, and messages. Results can be consumed by CI pipelines or editor integrations to surface issues in pull requests, and they support exporting as JSON for automation and targeted fixes.
The tool does not execute JSP, ensuring safety in shared environments. It is suitable for development, code reviews, and continuous integration workflows.