Go Code Formatter

The tool formats Go source code by applying canonical formatting rules (gofmt). It accepts plain Go source text and returns a formatted version that is consistent with standard Go style. It preserves comments and string literals as much as possible while adjusting whitespace, indent, and line breaks to canonical form.
Core logic: It uses the Go parser and formatting library to validate syntax and produce canonical output. It supports two modes: standard and gofumpt-compatible (advanced). If syntax errors are present, the formatter returns a structured error instead of applying formatting.
Audience and value: Developers, code reviewers, and CI pipelines benefit from reduced diffs, faster reviews, and consistent project style. Use cases include formatting a single snippet pasted into the tool, batch formatting in pre-commit processes, or integrating with an editor workflow to format code on save.
Differentiators and features: Real-time formatting; compatibility with official Go formatting; optional strict mode; partial-file formatting; optional diff output. The tool does not perform linting or semantic changes, and it ensures formatting changes never alter program behavior.