Go Code Formatter

gofmt is the official Go code formatter created by the Go team. Unlike most languages where style is a matter of preference, the Go community treats gofmt output as the canonical style — all Go code is expected to be formatted with it. Using gofmt eliminates style debates, makes code reviews faster, and ensures your code passes CI checks in projects that enforce formatting. This online tool applies the same rules so you can format Go code instantly without installing Go locally.

The Go team made a deliberate choice to use tabs for indentation. The reasoning: tab width is configurable per editor, so developers who prefer 2-space visual indentation can set their editor to display tabs as 2 columns, while others use 4 or 8. This respects personal preferences without creating different physical files. Spaces lock in a specific visual width for everyone, causing disagreements. gofmt enforces tabs, so all correctly formatted Go code uses tabs.

Go's grammar actually requires this — it is not just a style choice. Go uses semicolons as statement terminators, but they are inserted automatically by the lexer at the end of lines that end with certain tokens. If you put the opening brace on a new line after a function or if-statement, the lexer inserts a semicolon after the closing parenthesis, causing a syntax error. This is why Go's brace style is enforced at the language level, not just by convention.

The gofmt convention groups imports into two blocks separated by a blank line: stdlib packages first (fmt, net/http, os, etc.), then third-party packages (github.com/..., k8s.io/..., etc.). Some teams add a third group for internal packages. The goimports tool can do this grouping automatically. This online formatter separates stdlib from third-party imports and inserts the blank line separator between groups.

This tool is ideal for quick formatting checks, learning gofmt rules, or formatting code snippets without a local Go installation. For production code, you should still run gofmt (or goimports which extends gofmt) as part of your editor setup or CI pipeline. The online formatter implements the core gofmt rules in pure JavaScript, so it handles the vast majority of cases accurately, but very complex expressions or edge cases may differ slightly from the official gofmt binary.

gofmt handles formatting: indentation with tabs, brace placement, operator spacing, and blank lines. goimports does everything gofmt does, plus it automatically manages your import block — adding missing imports and removing unused ones based on the symbols used in your code. For local development, goimports is generally preferred. This online tool implements gofmt-style formatting rules; import management requires Go type analysis and cannot run in the browser.