🔧 Programming
✅ 100% Free
⚡ Instant
Go Formatter
Format Go code with gofmt-style tab indentation and K&R brace placement. Inspired by the official gofmt tool — the de-facto standard for Go formatting.
📥 Input
📤 Output
Ready — paste code and click Format · Ctrl+Enter to format
Lines: —
Size: —
Load example:
▶ Function
What is gofmt?
gofmt is Go's official code formatting tool, included with every Go installation. Unlike most languages where formatting is a matter of style guides and personal preference, Go takes an opinionated stance: all Go code should be formatted with gofmt. This eliminates formatting debates entirely. Key rules: tabs (not spaces) for indentation, opening braces on the same line, and no trailing semicolons (the compiler inserts them).
Frequently Asked Questions
The Go team chose tabs because they allow each developer to set their own visual indent width in their editor while keeping the actual file consistent.
gofmt enforces tabs, and Go code style discussions never include the spaces-vs-tabs debate — it's settled.Go's lexer automatically inserts semicolons at line ends based on specific rules (if the line ends with an identifier, literal, or certain tokens). This is why opening braces must be on the same line as the statement — putting them on a new line would insert a semicolon before the brace, causing a syntax error.
A struct defines a concrete type with fields (data). An interface defines a set of method signatures — any type that implements all those methods satisfies the interface implicitly (no explicit
implements keyword). This is called duck typing. Interfaces are used for polymorphism and testability in Go.
Done!