About Golang Diff
Compare Go source files to track function signature changes, struct field additions, and interface updates across refactors. Diff highlights Go-specific constructs — keywords, built-in types, raw string literals, and line comments.
Frequently Asked Questions
What is a Go diff tool?
A Go diff tool compares two Go source files and highlights every line-level difference — added lines in green, removed lines in red. It is useful for reviewing generated protobuf stubs, comparing gofmt output, and auditing changes to shared packages.
How do I compare two Go files while ignoring gofmt formatting differences?
Run gofmt on both files before comparing: gofmt -w file1.go && gofmt -w file2.go. Then paste both into the diff panels. All gofmt-normalised files have identical formatting, so the diff shows only logical changes — import additions, function signature changes, and logic edits.
Can a Go diff tool handle generated files like protobuf outputs?
Yes. Paste both generated files to compare API changes between proto versions. Generated Go files are large but the diff highlights only changed message fields, method signatures, and added service RPCs. Focus on the exported types rather than the internal implementation details.
What is the best way to review a Go interface change before committing?
Compare the old and new interface definitions. Any method added or removed is a breaking change for all implementing types. Any method signature change (parameter or return type) is also breaking. The diff makes it immediately visible whether a change is additive (safe) or breaking (requires updating all implementors).
Is my Go code sent to a server when using this online diff tool?
No. All comparison runs in your browser. Your Go source code is never transmitted to any server. This is safe for proprietary services, internal packages, and Go code in private repositories.
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