Handlebars Formatter

This tool formats Handlebars templates to a canonical, readable style. It preserves template semantics while normalizing whitespace, indentation, and line breaks, making complex templates easier to review, diff, and maintain. It targets templates used in component libraries, server-generated views, or build pipelines, ensuring consistent appearance across a codebase. It supports codebases with multiple templates, ensures consistent line endings, and reduces churn caused by inconsistent formatting.
Conceptually, the formatter parses the template into an abstract syntax representation and re-emits source with a deterministic style. It correctly handles blocks such as {{#if}}…{{else}}…{{/if}}, each with proper nesting, and preserves the position of helpers, partials, and inline expressions to avoid altering behavior. The approach is non-destructive and idempotent; repeated runs yield the same result.
Audience and value: front‑end developers, template authors, and CI pipelines benefit from predictable formatting, which reduces review time, helps automated diffs, and supports onboarding. The tool is useful when preparing templates for collaboration or when migrating code to a shared style standard. Teams can define repository conventions, and the tool can be integrated into pre-commit hooks.
Unique differentiators include a focus on Handlebars-accurate formatting without executing logic, and deterministic indentation rules. It runs offline and requires no runtime dependencies, making it suitable for local development and automated tooling. Optional future enhancements can include a minified output or project-specific style profiles. It does not modify semantics, and outputs can be diffed against previous versions to track changes.
Core features include: two-space indentation, consistent newline usage, comment preservation, and safe handling of edge cases like nested blocks and empty sections. The formatter also ensures stable spacing around mustache tags and inline expressions, producing a clean, maintainable template one file at a time. The output remains valid Handlebars syntax, enabling seamless integration into existing tooling.