register onclick events for encode buttonĭocument.getElementById('btnencode64'). This._keyStr.charAt(enc3) + this._keyStr.charAt(enc4) This._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + Var chr1, chr2, chr3, enc1, enc2, enc3, enc4 _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", This object is fully compatible with UTF-8 encoding. In this page it is presented a JavaScript object that can be used to encode / decode data with MIME base64. Encode and decode text to/from base64 and base64url, as per RFC-4648. On the other hand, the ASCII character set is quite simple to consume for most applications.įor more information on Base64 encoding and decoding, read this MDN guide.Base64-encoded data takes about 33% more space than the original data, but it is useful when you want to transfer compact and encrypted data from an aplication to another (for example from cliend side /browser to a script on server and vice versa). JavaScript base64/base64url encoder/decoder Source Code. But it can be risky sometimes, as not all applications and network communication devices can handle raw binary data. Of course, you can still choose to send binary data over the network. Base64 is a widely used encoding scheme for securely transmitting binary data as a stream of ASCII characters over the network. That's all folks for Base64 encoding and decoding in JavaScript. To encode Unicode characters, you first need to escape the input string to an array of 8-bit bytes (like UTF-8) and then use btoa() to encode it to Base64, as shown in the following example: function encodeUnicode ( str ) decodeUnicode ( 'SmF2YVNjcmlwdCBpcyBmdW4g8J+OiQ=' ) // JavaScript is fun □ decodeUnicode ( '8J+UpfCfkqE=' ) // □□ Conclusion If you execute the above code, you should see the following error output: Uncaught DOMException: Failed to execute 'btoa' on 'Window' : The string to be encoded contains characters outside of the Latin1 range. Here is an example: const str = 'JavaScript is fun □' // encode the string const encodedStr = btoa (str ) // print encoded string If your input data contains any character with more than 8 bits, for instance, a Unicode character, the btoa() function will throw an exception. log (encodedStr ) // output: SmF2YVNjcmlwdCBpcyBmdW4hIQ=īy default, the btoa() method works fine for binary data consisting of 8-bit bytes. The following example shows how you can use btoa() to Base64 encode a string in JavaScript: const str = 'JavaScript is fun!!' // encode the string const encodedStr = btoa (str ) // print encoded stringĬonsole. It accepts the binary string as an argument and returns a Base64 encoded ASCII string. The btoa() function (stands for binary-to-ASCII) is used to create a Base64 encoded ASCII string from the binary data. There are two built-in functions in JavaScript for encoding and decoding raw binary data into Base64 strings. In this article, you'll learn how to encode and decode Base64 strings in JavaScript. You first encode the binary file into a textual format, preferably ASCII. It only transforms the binary data into an ASCII character set that is extremely useful for transferring obfuscated strings over the network.įor instance, a simple example is sending an image or any other binary file to an email server that typically expects textual data. It is important to remember that Base64 is not an encryption or compression scheme. Base64 makes sure that the binary data doesn't change during transportation. It is commonly used for encoding and transporting data over media incompatible with transferring binary data. This means that the Base64 version of a string or file will be at least 133 the size of its source (a 33 increase). So, three 8-bits bytes of the input string/binary file (3×8 bits 24 bits) can be represented by four 6-bit Base64 digits (4×6 24 bits). Base64 is a widely used binary-to-text encoding scheme that transforms binary data into an equivalent ASCII character set by translating it into a radix-64 representation. Each Base64 digit represents exactly 6 bits of data.
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