FTL Editor

The FTL Editor is a developer-focused tool that enables authoring, validating, and previewing FreeMarker templates (FTL). It targets backend developers, template authors, and integration engineers who produce dynamic content for web apps, emails, or CMS pipelines. Users provide an FTL string and an optional data model to verify syntax, data binding, and rendering outcomes before deployment. The tool helps ensure templates render correctly across contexts and reduces debugging time in production.
Conceptually it treats the template as code plus a data context. The engine parses the FTL, builds an AST, resolves includes and macros, and uses a sample data model to render output. Rendering follows standard FreeMarker semantics: variables, conditionals, loops, and macro calls are evaluated in the given context. Diagnostic generation maps runtime issues to precise sources (line/column). No external data sources are invoked beyond the supplied data_model.
Unique value includes integrated validation against FreeMarker dialect rules, real-time feedback on data bindings, and export options for the template and sample output. It helps teams validate templates against CI data models and supports multiple contexts for testing different locales or customer data sets. It is designed to scale from single templates to template libraries in continuous delivery environments.
Core features include syntax checking, live render previews, error highlighting with line references, macro and include support, sample data presets, and export/save options. Use cases include email templates, dynamic page fragments, document generation, or configuration file templates. It is designed to scale from single templates to template libraries in continuous delivery environments.