How to do Base64 encoding in node js

Question

Does node js have built-in base64 encoding yet   The reason why I ask this is that final   from crypto can only output hex  binary or ascii data  For example   var cipher   crypto createCipheriv  des-ede3-cbc   encryption key  iv   var ciph   cipher update plaintext   utf8    hex    ciph    cipher final  hex     var decipher   crypto createDecipheriv  des-ede3-cbc   encryption key  iv   var txt   decipher update ciph   hex    utf8    txt    decipher final  utf8      According to the docs  update   can output base64-encoded data  However  final   doesn t support base64   I tried and it will break   If I do this   var ciph   cipher update plaintext   utf8    base64        ciph    cipher final  hex      Then what should I use for decryption  Hex or base64   Therefore  I m looking for a function to base64-encode my encrypted hex output

User · Accepted Answer

Buffers can be used for taking a string or piece of data and doing base64 encoding of the result. For example:

> console.log(Buffer.from("Hello World").toString('base64'));
SGVsbG8gV29ybGQ=
> console.log(Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
Hello World

Buffers are a global object, so no require is needed. Buffers created with strings can take an optional encoding parameter to specify what encoding the string is in. The available toString and Buffer constructor encodings are as follows:

'ascii' - for 7 bit ASCII data only. This encoding method is very fast, and will strip the high bit if set.

'utf8' - Multi byte encoded Unicode characters. Many web pages and other document formats use UTF-8.

'ucs2' - 2-bytes, little endian encoded Unicode characters. It can encode only BMP(Basic Multilingual Plane, U+0000 - U+FFFF).

'base64' - Base64 string encoding.

'binary' - A way of encoding raw binary data into strings by using only the first 8 bits of each character. This encoding method is deprecated and should be avoided in favor of Buffer objects where possible. This encoding will be removed in future versions of Node.

User · Answer

crypto now supports base64  reference    cipher final  base64      So you could simply do   var cipher   crypto createCipheriv  des-ede3-cbc   encryption key  iv   var ciph   cipher update plaintext   utf8    base64    ciph    cipher final  base64     var decipher   crypto createDecipheriv  des-ede3-cbc   encryption key  iv   var txt   decipher update ciph   base64    utf8    txt    decipher final  utf8

User · Answer

I am using following code to decode base64 string in node API nodejs version 10 7 0  let data    c3RhY2thYnVzZS5jb20        Base64 string let buff   new Buffer data   base64       Buffer let text   buff toString  ascii       this is the data type that you want your Base64 data to convert to console log       data      converted from Base64 to ASCII is      text            Please don t try to run above code in console of the browser  won t work  Put the code in server side files of nodejs  I am using above line code in API development

User · Answer

Buffers can be used for taking a string or piece of data and doing base64 encoding of the result  For example   You can install Buffer via npm like  - npm i buffer --save  you can use this in your js file like this  -   var buffer   require  buffer    Buffer   - gt  gt  console log buffer from  Hello Vishal Thakur   toString  base64     SGVsbG8gVmlzaGFsIFRoYWt1cg       Result  - gt  gt  console log buffer from  SGVsbG8gVmlzaGFsIFRoYWt1cg      base64   toString  ascii    Hello Vishal Thakur      Result

User · Answer

The accepted answer previously contained new Buffer    which is considered a security issue in node versions greater than 6  although it seems likely for this usecase that the input can always be coerced to a string    The Buffer constructor is deprecated according to the documentation   Here is an example of a vulnerability that can result from using it in the ws library   The code snippets should read   console log Buffer from  Hello World   toString  base64     console log Buffer from  SGVsbG8gV29ybGQ     base64   toString  ascii       After this answer was written  it has been updated and now matches this

User · Answer

I have created a ultimate small js npm library for the base64 encode decode conversion in Node js   Installation  npm install nodejs-base64-converter --save   Usage  var nodeBase64   require  nodejs-base64-converter     console log nodeBase64 encode  test text       dGVzdCB0ZXh0 console log nodeBase64 decode  dGVzdCB0ZXh0       test text

User · Answer

You can do base64 encoding and decoding with simple javascript           input   keyup function           var value     this  val             hash   Base64 encode value            test   html hash         var decode   Base64 decode hash             decode   html decode         var Base64   keyStr  ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789     encode function e  var t    var n r i s o u a var f 0 e Base64  utf8 encode e  while f lt e length  n e charCodeAt f    r e charCodeAt f    i e charCodeAt f    s n gt  gt 2 o  n amp 3  lt  lt 4 r gt  gt 4 u  r amp 15  lt  lt 2 i gt  gt 6 a i amp 63 if isNaN r   u a 64 else if isNaN i   a 64 t t this  keyStr charAt s  this  keyStr charAt o  this  keyStr charAt u  this  keyStr charAt a  return t  decode function e  var t    var n r i var s o u a var f 0 e e replace    A-Za-z0-9     g     while f lt e length  s this  keyStr indexOf e charAt f     o this  keyStr indexOf e charAt f     u this  keyStr indexOf e charAt f     a this  keyStr indexOf e charAt f     n s lt  lt 2 o gt  gt 4 r  o amp 15  lt  lt 4 u gt  gt 2 i  u amp 3  lt  lt 6 a t t String fromCharCode n  if u  64  t t String fromCharCode r  if a  64  t t String fromCharCode i   t Base64  utf8 decode t  return t   utf8 encode function e  e e replace  rn g  n   var t    for var n 0 n lt e length n    var r e charCodeAt n  if r lt 128  t  String fromCharCode r  else if r gt 127 amp  amp r lt 2048  t  String fromCharCode r gt  gt 6 192  t  String fromCharCode r amp 63 128  else t  String fromCharCode r gt  gt 12 224  t  String fromCharCode r gt  gt 6 amp 63 128  t  String fromCharCode r amp 63 128   return t   utf8 decode function e  var t    var n 0 var r c1 c2 0 while n lt e length  r e charCodeAt n  if r lt 128  t  String fromCharCode r  n   else if r gt 191 amp  amp r lt 224  c2 e charCodeAt n 1  t  String fromCharCode  r amp 31  lt  lt 6 c2 amp 63  n  2 else c2 e charCodeAt n 1  c3 e charCodeAt n 2  t  String fromCharCode  r amp 15  lt  lt 12  c2 amp 63  lt  lt 6 c3 amp 63  n  3  return t       Define the string var string    Hello World        Encode the String var encodedString   Base64 encode string   console log encodedString      Outputs   SGVsbG8gV29ybGQh      Decode the String var decodedString   Base64 decode encodedString   console log decodedString      Outputs   Hello World   lt  script gt  lt  div gt    This is implemented in this Base64 encoder decoder

[node.js] How to do Base64 encoding in node.js?

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