How to convert text to binary code in JavaScript

Question

Text to Binary Code I want JavaScript to translate text in a textarea into binary code  For example  if a user types in  quot TEST quot  into the textarea  the value  quot 01010100 01000101 01010011 01010100 quot  should be returned  I would like to avoid using a switch statement to assign each character a binary code value  e g  case  quot T quot   return  quot 01010100  or any other similar technique  Here s a JSFiddle to show what I mean  Is this possible in native JavaScript

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this seems to be the simplified version   Array from  abc   map  each   gt each charCodeAt 0  toString 2   join

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Just a hint into the right direction  var foo    TEST       res         foo split     forEach function  letter         var bin       letter charCodeAt  0   toString  2            padding   8 - bin length       res push  new Array  padding 1   join   0      bin         console log  res

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var PADDING    00000000   var string    TEST  var resultArray       for  var i   0  i  lt  string length  i        var compact   string charCodeAt i  toString 2    var padded    compact substring 0  PADDING length - compact length    compact    resultArray push padded     console log resultArray join

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Provided you re working in node or a browser with BigInt support  this version cuts costs by saving the expensive string construction for the very end   const zero   0n const shift   8n  function asciiToBinary  str      const len   str length   let n   zero   for  let i   0  i  lt  len  i          n    n  lt  lt  shift    BigInt str charCodeAt i         return n toString 2  padStart len   8  0      It s about twice as fast as the other solutions mentioned here including this simple es6  implementation   const toBinary   s   gt      s     map x   gt  x      codePointAt        toString 2       padStart 8 0         join       If you need to handle unicode characters  here s this guy   const zero   0n const shift   8n const bigShift   16n const byte   255n  function unicodeToBinary  str      const len   str length   let n   zero   for  let i   0  i  lt  len  i          const bits   BigInt str codePointAt i       n    n  lt  lt   bits  gt  byte   bigShift   shift     bits       const bin   n toString 2    return bin padStart 8   Math ceil bin length   8   0

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traverse the string convert every character to their char code  convert the char code to binary push it into an array and add the left 0s  return a string separated by space    Code   function textToBin text      var length   text length        output         for  var i   0 i  lt  length  i          var bin   text i  charCodeAt   toString 2       output push Array 8-bin length 1  join  0     bin          return output join         textToBin   a     gt   00100001 01100001    Another way   function textToBin text      return       Array        from text         reduce  acc  char    gt  acc concat char charCodeAt   toString 2               map bin   gt   0  repeat 8 - bin length    bin          join

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Thank you Majid Laissi for your answer   I made 2 functions out from your code   the goal was to implement convertation of string to VARBINARY  BINARY and back  const stringToBinary   function string  maxBytes        for BINARY maxBytes   255     for VARBINARY maxBytes   65535   let binaryOutput         if  string length  gt  maxBytes        string   string substring 0  maxBytes          for  var i   0  i  lt  string length  i          binaryOutput    string i  charCodeAt 0  toString 2                return binaryOutput       and backward convertation   const binaryToString   function binary      const arrayOfBytes   binary split          let stringOutput          for  let i   0  i  lt  arrayOfBytes length  i          stringOutput    String fromCharCode parseInt arrayOfBytes i   2           return stringOutput       and here is a working example  https   jsbin com futalidenu edit js console

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What you should do is convert every char using charCodeAt function to get the Ascii Code in decimal  Then you can convert it to Binary value using toString 2    HTML    lt input id  ti1  value   TEST   gt   lt input id  ti2   gt   lt button onClick  convert     gt Convert  lt  button gt    JS   function convert       var output   document getElementById  ti2      var input   document getElementById  ti1   value    output value         for  var i   0  i  lt  input length  i            output value    input i  charCodeAt 0  toString 2                 And here s a fiddle  http   jsfiddle net fA24Y 1

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This might be the simplest you can get   function text2Binary string        return string split     map function  char            return char charCodeAt 0  toString 2          join

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Here s a pretty generic  native implementation  that I wrote some time ago       ABC - a generic  native JS  A scii B inary C onverter      c  2013 Stephan Schmitz  lt eyecatchup gmail com gt     License  MIT  http   eyecatchup mit-license org    URL  https   gist github com eyecatchup 6742657 var ABC       toAscii  function bin        return bin replace   s  01  8  s  g  function bin          return String fromCharCode parseInt bin  2                 toBinary  function str  spaceSeparatedOctets        return str replace    s S  g  function str          str   ABC zeroPad str charCodeAt   toString 2          return  1    spaceSeparatedOctets   str   str                     zeroPad  function num        return  00000000  slice String num  length    num          and to be used as follows   var binary1         01100110011001010110010101101100011010010110111001100111001000000110110001110101011000110110101101111001       binary2         01100110 01100101 01100101 01101100 01101001 01101110 01100111 00100000 01101100 01110101 01100011 01101011 01111001       binary1Ascii   ABC toAscii binary1       binary2Ascii   ABC toAscii binary2    console log  Binary 1                        binary1   console log  Binary 1 to ASCII               binary1Ascii   console log  Binary 2                        binary2   console log  Binary 2 to ASCII               binary2Ascii   console log  Ascii to Binary                 ABC toBinary binary1Ascii           default  space-separated octets console log  Ascii to Binary  wo spaces      ABC toBinary binary1Ascii  0        2nd parameter false to not space-separate octets   Source is on Github  gist   https   gist github com eyecatchup 6742657  Hope it helps  Feel free to use for whatever you want  well  at least for whatever MIT permits

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The other answers will work for most cases  But it s worth noting that charCodeAt   and related don t work with UTF-8 strings  that is  they throw errors if there are any characters outside the standard ASCII range   Here s a workaround      UTF-8 to binary var utf8ToBin   function  s        s   unescape  encodeURIComponent  s          var chr  i   0  l   s length  out           for    i  lt  l  i               chr   s charCodeAt  i   toString  2            while  chr length   8    0    chr    0    chr            out    chr            return out         Binary to UTF-8 var binToUtf8   function  s        var i   0  l   s length  chr  out           for    i  lt  l  i    8            chr   parseInt  s substr  i  8    2   toString  16            out              chr length   2    0     chr    0    chr              return decodeURIComponent  out         The escape unescape   functions are deprecated  If you need polyfills for them  you can check out the more comprehensive UTF-8 encoding example found here  http   jsfiddle net 47zwb41o

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8-bit characters with leading 0   sometext           split              map  char    gt   00  concat char charCodeAt 0  toString 2   slice -8            join         If you need 6 or 7 bit  just change  slice -8

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var UTF8ToBin function f  for var a c 0 d  f unescape encodeURIComponent f    length b  quot  quot  c lt d c    for a f charCodeAt c  toString 2  a length 8  0   a  quot 0 quot  a b  a return b  binToUTF8 function f  for var a c 0 d f length b  quot  quot  c lt d c  8  b   quot   quot    a parseInt f substr c 8  2  toString 16   length 2  0 a  quot 0 quot  a  return decodeURIComponent b     This is a small minified JavaScript Code to convert UTF8 to Binary and Vice versa

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Try this   String prototype toBinaryString   function spaces   0        return this split     map function character            return character charCodeAt 0  toString 2          join     repeat spaces        And use it like this    test string  toBinaryString 1      with spaces  test string  toBinaryString       without spaces  test string  toBinaryString 2      with 2 spaces

[javascript] How to convert text to binary code in JavaScript?

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