Added atob and btoa for node

snippets/atob.md

@@ -0,0 +1,13 @@
+### atob
+
+Decodes a string of data which has been encoded using base-64 encoding.
+
+Create a `Buffer` for the given string with base-64 encoding and use `Buffer.toString('binary')` to return the decoded string.
+
+```js
+const atob = str => new Buffer(str, 'base64').toString('binary');
+```
+
+```js
+atob('Zm9vYmFy'); // 'foobar'
+```

snippets/btoa.md

@@ -0,0 +1,13 @@
+### btoa
+
+Creates a base-64 encoded ASCII string from a String object in which each character in the string is treated as a byte of binary data.
+
+Create a `Buffer` for the given string with binary encoding and use `Buffer.toString('base64')` to return the encoded string.
+
+```js
+const btoa = str => new Buffer(str, 'binary').toString('base64');
+```
+
+```js
+btoa('foobar'); // 'Zm9vYmFy'
+```

tag_database

@@ -1,8 +1,10 @@
 anagrams:string,recursion
 arrayToHtmlList:browser,array
+atob:node,string,utility
 average:math,array
 averageBy:math,array,function
 bottomVisible:browser
+btoa:node,string,utility
 byteSize:string
 call:adapter,function
 capitalize:string,array