Obfuscator options

Pass an ObfuscatorOptions object as the second argument to obfuscate. Every field is optional.

ObfuscatorOptions

interface ObfuscatorOptions {
  minify?: boolean
  verbose?: boolean
  transforms?: TransformsMap
  stringGeneratorMode?: StringGeneratorMode | readonly StringGeneratorMode[]
  seed?: number
}

`minify`

Type: boolean
Default: false Passes Babel’s minified flag to the generator, removing optional whitespace and line breaks from the returned JavaScript.

`verbose`

Type: boolean
Default: false Prints the name and elapsed milliseconds of each executed stage to standard error. It does not change the returned source.

`transforms`

Type: object
Default: omitted No configurable transform runs unless its key is true. Transforms with settings also accept an options object. An omitted key or false means that transform does not run. Internal preparation passes are outside this map and always run. The defaults for minify, verbose, stringGeneratorMode, and seed do not cause transforms to run. They control output or supply settings used by transforms that do run. renameIdentifiers and specialsToStrings also accept { stringGeneratorMode }. concealStrings accepts { cache, cover, scope }. pack accepts { escapeStrict, skipGlobals, stringGeneratorMode }. mangleProperties accepts its property options.

Run transforms

const output = obfuscate(source, {
  transforms: {
    foldConstants: true,
    numbersToStrings: true,
  },
})

Removal

Key	Reference
`dropConsole`	Drop console calls
`dropDebugger`	Drop debugger statements
`removeUnreachableCode`	Remove unreachable code
`removeUnusedCode`	Remove unused code
`removeAnonymousFunctionNames`	Remove anonymous function names

Simplification and inlining

Key	Reference
`argumentsToParameters`	Arguments to parameters
`foldConstants`	Fold constants
`foldBuiltinMethods`	Fold built-in methods
`extractObjectProperties`	Extract object properties
`inlineFunctions`	Inline functions
`collapseSingleUseTemps`	Collapse single-use temporaries

Declarations and functions

Key	Reference
`constToLet`	Const to let
`constLetToVar`	Const and let to var
`hoistVariables`	Hoist variables
`objectMethodToProperty`	Object methods to properties
`arrowToFunction`	Arrow to function
`functionDeclarationToExpression`	Function declarations to expressions
`packDeclarationsIntoParameters`	Pack declarations into parameters
`reorderFunctionDeclarations`	Reorder function declarations

Control flow

Key	Reference
`switchToIf`	Switch to if
`forToWhile`	For to while
`doWhileToWhile`	Do-while to while
`optionalChainingToTernary`	Optional chaining to ternaries
`nullishCoalescingToTernary`	Nullish coalescing to ternaries
`logicalToTernary`	Logical expressions to ternaries
`ternaryToIf`	Ternaries to if statements

Expressions

Key	Reference
`updateToAssignment`	Updates to assignments
`expandBinaryAssignment`	Expand binary assignments
`expandLogicalAssignment`	Expand logical assignments
`yodifyConditions`	Yodify conditions

Names and literals

Key	Reference
`specialsToStrings`	Special values to strings
`numbersToStrings`	Numbers to strings
`concealStrings`	Conceal strings
`mangleProperties`	Mangle properties
`renameIdentifiers`	Rename identifiers

Packing

Key	Reference
`packExpressions`	Pack expressions
`pack`	Pack into a Function constructor

`stringGeneratorMode`

Type: 'mangled' | 'hexadecimal' | 'randomized' | 'zeroWidth' | 'number' | readonly StringGeneratorMode[]
Default: 'mangled' Sets the default style for generated identifiers, labels, property names, and string contents. An array mixes its modes with the seeded random source. An empty array is invalid. See String generator modes.

`seed`

Type: number
Default: 0 Seeds built-in randomized choices. The same seed and other inputs produce the same output for fixed package and Node.js versions. This random source is not cryptographic.

Configure transforms

Choose individual passes, set a naming style, and configure property mangling.

Get started

Reference

Support

`minify`

`verbose`

`transforms`

Removal

Simplification and inlining

Declarations and functions

Control flow

Expressions

Names and literals

Packing

`stringGeneratorMode`

`seed`

Configure transforms

​minify

​verbose

​transforms

​Removal

​Simplification and inlining

​Declarations and functions

​Control flow

​Expressions

​Names and literals

​Packing

​stringGeneratorMode

​seed

Configure transforms

`minify`

`verbose`

`transforms`

Removal

Simplification and inlining

Declarations and functions

Control flow

Expressions

Names and literals

Packing

`stringGeneratorMode`

`seed`