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Zig Language Formatter

Format and beautify Zig source code — brace placement, operator/comma spacing (leaving strings, character literals, and comments untouched), block-depth indentation, and optional trailing commas on multi-line lists, matching zig fmt conventions. Includes basic bracket-balance validation. Runs entirely in your browser.

Input

Drop a file or browse
One file · text
Or

Output

Validation
Issue
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Formatted Zig Code
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Guides

Paste unformatted Zig source and get back code with consistent spacing, brace placement, and block-depth indentation — matching zig fmt conventions as closely as a browser-based, regex-driven formatter can. Strings, character literals, line comments, block comments, and multi-line (\\) strings are recognized and left byte-for-byte untouched; only the surrounding code gets reformatted. A quick validation pass flags unbalanced braces, parentheses, or brackets. Everything runs locally in your browser.

How to use it

  1. Paste your Zig source, or upload a .zig file.
  2. Choose 4 spaces (the zig fmt default), 2 spaces, or Tabs for indentation.
  3. Turn on Add trailing commas to multi-line arg/field lists to append a trailing comma to the last item of a struct literal, array, or argument list that spans multiple lines — off leaves your original list endings untouched.
  4. Check the Validation panel for any bracket-balance issues, then copy or download the formatted result.

What it formats

  • Brace placement: moves a bare { on its own line up onto the previous line (fn foo()\n{ → fn foo() {).
  • Spacing around binary operators (+ - * / % == != <= >= && || << >> ++ **), compound assignment (+= -= *= /= …), commas, semicolons, and after : in type annotations — while leaving unary -/*/& untouched.
  • if/while/for/switch/defer/catch/orelse/try/comptime and similar keywords get a space before ( or {; else/struct/enum/union/error get consistent brace spacing too.
  • Re-indents every line by net brace/paren/bracket depth, and collapses runs of blank lines to one (removing a stray blank right after { or right before a closing }/)/]).

Does it validate the code semantically?

No — this checks bracket balance only (unmatched or missing {}/()/[], an unterminated block comment), not whether the Zig actually compiles. For real validation, use zig build or zig ast-check.

Is my code uploaded anywhere?

No. Segmenting, spacing, and re-indenting all run locally in your browser; your Zig source is never sent to a server.

Need to format a different systems language?

Use the Lua Code Formatter or the Go Formatter for other hand-rolled, browser-side formatters, or the Elixir Code Formatter if your project mixes Zig with a BEAM-language backend.

zigcode formatterbeautifyindentpretty printzig fmt

Use it from code

From 3 credits per call

REST API

curl -X POST https://api.iotools.cloud/v1/tool/zig-language-formatter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "zigInput": "const std=@import(\"std\");\nconst print=std.debug.…",
    "indentStyle": "4spaces",
    "trailingComma": "true"
  }'

Swap in your own key from your account. The tool's fields are the body — no wrapper.

Ask an AI agent

Use the IOTools `zig-language-formatter` tool (Zig Language Formatter) on this input:

YOUR_INPUT_HERE

Paste this at any agent connected to the IOTools MCP server, then add your input.

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