FTL Validator

The online FTL validator analyzes FreeMarker Template Language templates for syntax accuracy and semantic consistency.
It accepts FTL code, checks for invalid tokens, misplaced directives, and improper macro usage, and reports issues with exact line and column references to guide quick fixes.
It is designed for template authors, backend engineers, and CI workflows.

Conceptually, the tool parses FTL code into an abstract syntax tree, analyzes directives, expressions, and macros, and checks include/import references for correctness.
It returns structured results with error or warning messages, their location, an error code, and optional suggested corrections.

Audience includes Java web developers, CMS teams, and template authors deploying dynamic content with FreeMarker. The validator’s value lies in precise error localization, dialect awareness, and actionable guidance, reducing manual debugging time and accelerating safe template iterations across teams.
Documentation references and example FTL snippets are provided in the tool's help output for faster remediation.

Core features include syntax validation, macro and include/import consistency checks, undefined-variable detection, and optional batch validation across multiple templates. It supports UTF-8 templates, reports clear line/column positions, and integrates with CI pipelines and local development workflows as a lightweight, dependency-free tool.