Unminify a file

npx wakaru input.js -o output.js

Without -o, output goes to stdout. Stdin works too. For a quick look without installing anything, paste the code into the playground.

What comes back

Wakaru rewrites the AST, not the whitespace. Minifier tricks like !0, void 0 === t, and comma chains become plain syntax again. Transpiler helpers become the constructs they replaced: an _asyncToGenerator state machine comes back as async/await, _createClass wiring comes back as a class. See What is Wakaru for a full before and after.

Variable names

Mangled names like e and t mostly stay short. Wakaru applies conservative renaming heuristics where the code gives evidence, and stops there. Two ways to get real names back:

• A source map with original names. See Source maps.
• An LLM renamer like humanify, if guessed names are acceptable.

Options worth knowing

npx wakaru input.js --level minimal -o output.js   # behavioral fidelity first
npx wakaru input.js --formatter -o output.js       # final formatting pass

--formatter runs a formatting pass after decompilation. It is off by default. For what each level may change, see Rewrite levels.