JSF**k

JSF**k is an esoteric and educational programming style based on the atomic parts of JavaScript. It uses only six different characters to write and execute code.

It does not depend on a browser, so you can even run it on Node.js.

Use the form below to convert your own script. Uncheck "eval source" to get back a plain string.

Basics

• false => ![]
• true => !![]
• undefined => [][[]]
• NaN => +[![]]
• Infinity => +(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]]+[+[]])
• 0 => +[]
• 1 => +!+[]
• 2 => !+[]+!+[]
• 10 => [+!+[]]+[+[]]
• Array => []
• Number => (+[])
• String => ([]+[])
• Boolean => (![])
• Function => []["at"]
• RegExp => Function("return/"+false+"/")()
• a => (false+"")[1]
• b => ([]["entries"]()+"")[2]
• c => ([]["at"]+"")[3]
• d => (undefined+"")[2]
• e => (true+"")[3]
• f => (false+"")[0]
• g => (false+[0]+String)[20]
• h => (+(101))["to"+String["name"]](21)[1]
• i => ([false]+undefined)[10]
• j => ([]["entries"]()+"")[3]
• k => (+(20))["to"+String["name"]](21)
• l => (false+"")[2]
• m => (Number+"")[11]
• n => (undefined+"")[1]
• o => (true+[]["at"])[10]
• p => (+(211))["to"+String["name"]](31)[1]
• q => ("")["fontcolor"]([0]+false+")[20]
• r => (true+"")[1]
• s => (false+"")[3]
• t => (true+"")[0]
• u => (undefined+"")[0]
• v => (+(31))["to"+String["name"]](32)
• w => (+(32))["to"+String["name"]](33)
• x => (+(101))["to"+String["name"]](34)[1]
• y => (NaN+[Infinity])[10]
• z => (+(35))["to"+String["name"]](36)
• A => (NaN+[]["entries"]())[11]
• B => (+[]+Boolean)[10]
• C => Function("return escape")()(("")["italics"]())[2]
• D => Function("return escape")()([]["at"])["at"]("-1")
• E => (RegExp+"")[12]
• F => (+[]+Function)[10]
• G => (false+Function("return Date")()())[30]
• I => (Infinity+"")[0]
• M => (true+Function("return Date")()())[30]
• N => (NaN+"")[0]
• R => (+[]+RegExp)[10]
• S => (+[]+String)[10]
• T => (NaN+Function("return Date")()())[30]
• [space] => (NaN+[]["at"])[11]
• " => ("")["fontcolor"]()[12]
• % => Function("return escape")()([]["at"])[22]
• & => ("")["fontcolor"](")[13]
• ( => ([]["at"]+"")[11]
• ) => (""+[]["at"])[12]
• + => (+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]])+[])[2]
• , => [[]]["concat"]([[]])+""
• - => (+(.+[0000001])+"")[2]
• . => (+(+!+[]+[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+[!+[]+!+[]]+[+[]])+[])[+!+[]]
• / => (false+[0])["italics"]()[10]
• : => (RegExp()+"")[3]
• ; => ("")["fontcolor"](NaN+")[21]
• < => ("")["italics"]()[0]
• = => ("")["fontcolor"]()[11]
• > => ("")["italics"]()[2]
• ? => (RegExp()+"")[2]
• [ => ([]["entries"]()+"")[0]
• \ => (RegExp("/")+"")[1]
• ] => ([]["entries"]()+"")[22]
• { => ([0]+false+[]["at"])[20]
• } => ([]["at"]+"")["at"]("-1")