toBlob(doc). width); directly after setting src I get 0 on the first load in Chrome, but on subsequent page reloads I get the actual width of the image. – NFTX. The whole procedure would look something like this: Jul 18, 2020 · 1. I suspect the difference is that node is storing the string as bytes from a base64 string, while go is storing the string as bytes from an ascii/utf8 string represented as base64. However, you don't need to get a blob from node-fetch. Since you’re receiving a Buffer back as output, Buffer. 24. 9. Tool to decode Protobuf without having the original . Nov 16, 2022 · Using the atob function is deprecated and I suggest you this little snippet to decode base64 encoded strings: const encoded = "SOME_BASE64_STRING". Apr 7, 2020 · To convert a string into a Base64 encoded string, we first create a buffer from the given string using the Buffer. In this article, you will be introduced to the btoa and atob JavaScript functions that are available in modern web browsers. toString("base64") n = 1 to 10 (Spacing) Oct 17, 2023 · The core functions to base64 encode and decode in JavaScript are btoa() and atob() . We can create an array of byte values by applying this using the . Base64 エンコード. The legacy version with Node. This is to ensure that the data remain intact without modification during transport. Only thing I've found is to dump the already-encoded buffer to a base64, read it back into the Feb 22, 2019 · Decode Base64 to file using the free online decoder, which allows you to preview files directly in the browser, as well as download them, get the hex dump for any binary data, and get summary information about the original file. Dec 2, 2016 · var utf8encoded = Buffer. And, of course, you will have a special link to download the audio file to your device. In particular, using the following code: var img = new Buffer(b64, 'base64'). buffer). base64 - W29iamVjdCBBcnJheUJ1ZmZlcl0= library am using decoding - react-native-base64 Jul 20, 2021 · 3 Ways to Convert String to Base64. const asciiString = 'hello'; // This will work. js is by using the buf. Then on the nodejs server you can use Buffer directly: const b64 = "SGVsbG8sIFdvcmxkIQ=="; const fileDataProcessed = Buffer. This method allows you to create a new Buffer object from a string, array, or another Buffer object. 2. Decoder. Base64 in your source file to use its methods. 1. This btoa () method simply encodes or creates the Base64 ASCII string from the given file or object. Println(buf) The above prints: both of which are rather different from node's output. Here's an in-depth explanation with proper code examples and outputs: Jan 20, 2012 · let str = Buffer. stringify(obj); let objJsonB64 = Buffer. const byteCharacters = atob(b64Data); Each character's code point (charCode) will be the value of the byte. If you need to get Base64 string from Image please visit another free web tool Online Image Encoder. copy doesn't apply encoding when copying and using toString() is 150x slower in a quick test. from('someText'). Jul 2, 2024 · An Encoding is a radix 64 encoding/decoding scheme, defined by a64-character alphabet. You can just get a buffer directly from the response. I can read a lot of the file, but there are tons of weird characters in there as well. Base64 Encoding Javascript to C#. log(reader. from ( str , 'utf-8' ) ; // decode buffer as Base64 const base64 = buff . com Nov 30, 2019 · Base64 encoding and decoding in JavaScript. As you can see, it only takes a few lines of code to seamlessly convert between raw strings and base64 encoded strings. The hexadecimal transcription in ASCII of the bytes would increase the size by two when we want to represent binary data (an image, an executable) in a textual message, such as an email. Decode. – Jaromanda X. toString('base64') will convert the raw binary data in the buffer to a base64 representation of the data. base64; Base64 streaming encoder and decoder. By default, toString () converts the buffer to a string using UTF8 encoding. toString("base64") to get base-64 encoded of the buffer content. Mar 14, 2015 · I want to convert a message like "Hello World" to base58 and then been able to decode it using node. var buff = Buffer. URLEncoding. Oct 10, 2022 at 16:09. To transform that buffer instance into a string that can be used in JSON. If I do console. Jun 15, 2022 · The Node. from(uint8arr. edited Nov 16, 2022 at 21:19. stringify(words); // 'Hello, World!' The WordArray is CryptoJS's format-independent representation of data. from() method. Latest version: 1. As per the doc at this location. toString('base64'); Apr 3, 2020 · for sending docx file to browser use toBlob() method instead of using toBase64String() method and again converting to buffer. js v6. let objJsonStr = JSON. Base64 encoding schemes are commonly used when there is a need to encode binary data, especially Mar 10, 2023 · Here's how to do Base64 encoding and decoding using Buffer in Node. from(base64data, 'base64'). However I need the actual ArrayBuffer. proto files. I'm trying to decode a base64 string representing an image stored in a db. No problem there: it was, so it'll do the right thing: Protobuf Decoder. For example, if you create a buffer from a string using Buffer. However, when encoding a string, make sure the string is in the correct character encoding. from(base64String, "base64"); return buf. readFile(attachment, function(err, data) {. drawImage(this, 0, 0, canvas. toString(); // ' à la mode' The toString method of Buffer defaults to utf8, but you can specify any desired encoding. toString ('base64')". Before saving a file representation to the DB you can just use the toString method with base 64 encoding: var base64pdf = pdf. write(slugId2, SLUGID_SIZE, 'base64'); - because the length defaults to buffer. from(base64encoded, 'base64'). Node currently has no efficient way to encode a buffer as a Base64 buffer without creating an interim V8 String. 0 using the constructor method has been deprecated and the following method should instead be used to construct a new buffer from a base64 encoded string: var b64string = /* whatever */; var buf = Buffer. Feb 18, 2021 · I am using Buffer to convert a string to Base64 encoded in one of the cloud function and during bulk processing,this base64 encoding is taking 15 seconds to convert a string into base64 encoded. 8k 15 97 119. Aug 1, 2018 · b64. atob() and buf. Pass it your base64-encoded string as the first argument and the base64 encoding as the second argument. These methods atob () and btoa () are used to convert to string and base64 format respectively. var text = 'Hello World'; var buff = new Buffer. Again, note You can always prettify above code by providing some spacing, so that when some one decode it back to JSON String it would look good. Jun 5, 2021 · The result from Buffer. length - offset - in this case, it would be SLUGID_SIZE. split(""). from(string, 'base64')). The Buffer class implements the Uint8Array API and provides 1. 1. When decoding Base64 to Buffer, you can pass the Base64 encoded string as the first parameter to the Buffer. Syntax Buffer. Base64. from(b64, 'base64'). The data is a 29 byte custom formatted payload of bytes that describes an event. Converting a Buffer into a string using either UTF-8, UTF-16, or Latin1 is called decoding. from (text); var base64data = buff. js buffers are objects that store arbitrary binary data. from(base64, 'base64'); const text = buffer. log(image. atob()to decode any Base64 encoded data back to binary data -. Base64 encoding schemes are commonly used when there is a need to encode binary data, especially The interest of the base64 encoding is therefore not in the representation of textual data, but especially in the representation of binary data. . log( emBase64) // Saída: "RGV2UGxlbm8=" // Voltando para string var Apr 6, 2021 · const base64data = Buffer. from(objJsonStr). Please note that the preview is available only for textual values and known media files such as images, sounds, and May 7, 2015 · If trying to decode a Base64 representation of utf8 encoded data in node, you can use the native Buffer helper. from(base64String, 'base64 Jan 8, 2019 · For NodeJS (with node-fetch), you can get a buffer from blob using Buffer. You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format Nov 18, 2021 · Base64 Decode a Value in Node. Click on the Upload File button and select File. from(). So here's the recommended way Mar 29, 2016 · I tried to use return reader. 4. toString("base64"); console. toString ('base64'); This is the way I encode it. 3 & below, you need to use the buffer constructor (ie: new Buffer ) instead of Buffer. toString ( 'base64' ) ; // print Base64 string console . I have a client interface that sends binary data encoded in base64. base64data = new Buffer(data). Feb 17, 2016 · The file actually got bigger, from 9kb to 11 kb. toString(); we end up with a PDF of 109 kB in size and a document that can't be opened using PDF viewers. l, _ := base64. For example: > console. Buffer. const decoded = new Buffer(encoded , "base64"). toString('base64')) or decode a string and return a buffer (Buffer. Make sure to pass the correct encoding to initialize the buffer Convert Base64 to Audio online using a free decoder tool which allows you to decode Base64 as sound file and play it directly in the browser. Buffers have a toString () method that you can use to convert the buffer to a string. log(deserialized Sep 7, 2022 · Unicode uses various decoding and encoding formats. from("asdf"); // this is a string you can store in a JSON object somewhere const serialized = x. I need the server to decode that so I can extract the fields. toString first to make it work. Jan 26, 2013 at 10:27. If no character encoding is specified, UTF-8 will be used as the Jul 4, 2012 · I've got a data URL like this: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA What's the easiest way to get this as binary data (say, a Buffer) so I can write it to a file? Feb 13, 2012 · This example uses the built-in FileReader readDataURL() to do the conversion to base64 encoding. Oct 3, 2012 · And to decode the base64 string back to a Uint8Array: var u8_2 = new Uint8Array(atob(b64encoded). In JavaScript there are two functions respectively for decoding and encoding base64 strings: atob () btoa () The atob () function decodes a string of data which has been encoded using base-64 encoding. Meet Base64 Decode and Encode, a simple online tool that does exactly what it says: decodes from Base64 encoding as well as encodes into it quickly and easily. btoa() methods, and according to their documentation should not be used in new code. toString('utf8'); answered Dec 2, 2016 at 9:56. toString('base64')) Is there any alternate available in Node js to convert a string to base64 instead of using Buffer. Decode string in base64 and load as Jun 25, 2020 · Base64 encoding and decoding can be done in Node. then((blob) => { // saveAs from FileSaver will download the file saveAs(blob); }); Utilizando Base64 no navegador (Internet Explorer 10 e acima): O código abaixo pode ser copiado e colado dentro do Console do Chrome, para vê-lo executando. Here's an example: Dec 14, 2019 · Beware it's not the same as converting "to an UTF-8 string", since JavaScript only supports UCS-2 and UTF-16 strings. Here's my code: var base64data; fs. However, base64 can contain characters like + and / , which carry special meaning in the context of URLs. Jun 9, 2017 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Buffers can be used for taking a string or piece of data and doing Base64 encoding of the result. Encode/decode base64 data into ArrayBuffers. When encoding a Buffer to a string, this encoding will omit padding. RFC 4648also defines an alternate encoding, which isthe standard encoding with - and _ substituted for + and /. StdEncoding. The parameters are described below: Dec 12, 2011 · You don't need to "decode" a base64 string to draw it in a canvas, just assign it to an image source and draw that image in your canvas. Thank you. For example, the reverse operation would look like this The atob function will decode a base64-encoded string into a new string with a character for each byte of the binary data. toString()) // Output: 쭅 . from("SGVsbG8gV29ybGQ=", 'base64'). Since WebSockets Class Base64. log(text. Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data. arrayBuffer(); var processImageBuffer = arrayBufferToBuffer(processImageBuffer); // convert promise array to buffer const buf: Buffer = Buffer. toString('utf-8'); // Outputs original "Hello World" string. from Share Aug 21, 2020 · Node. decode(a String) returns a Buffer Aug 16, 2021 · The Buffer. Jun 3, 2023 · In Node. And this atob () method decodes the above Base64 string and returns Dec 1, 2023 · 3. log(serialized); // YXNkZg== // you can get the serialized base64 from a JSON object const deserialized = Buffer. This length is useful for sizing your buffer but part of the buffer won't be written and thus won't be valid UTF-8. The btoa() method of the Window interface creates a Base64 -encoded ASCII string from a binary string (i. Java provides a class Base64 to deal with encryption. Made by pawitp. In addition, you will receive some basic information about this audio file (duration, MIME type, extension, size). Encoding the original string to base64: The Buffer class in Node. buffer. You can use these methods at the following levels. toString btoa Jun 14, 2024 · Base64. arrayBuffer());. Jan 20, 2014 · Good call. Sep 7, 2023 · Converting a buffer to Base64 in JavaScript is a common operation when working with binary data, such as images or files, and you want to represent it as a text-based string. Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by transforming it into a radix-64 representation. I'm trying to encode an image using base64 in Node. toString('ascii')) Hello World The Buffer constructor is a global object, so no require is needed none. The Base64 padding character '=' is accepted and interpreted as the end of the encoded byte data, but is not required. . toString() can also take other encodings, you can read more about the other supported encodings in the docs. Decode(base64Text, []byte(message)) log. You have to use only the real written length returned by the Decode function. atob 5 days ago · The ArrayBuffer object is used to represent a generic raw binary data buffer. Online Image Decoder. from () method that accepts the string to be converted and the current encoding of the string. 0. atob (): It decodes a Base64 encoded string created by btoa (). The toString() method is used for converting the Base64 buffer back into the string format. I didn't found a solution right now to convert it to a readable string and the other direction seems to be the same problem. Jan 26, 2013 · 1. toString('ascii'); I get a similar binary representation, except for the first bytes. I just want to get file object by decoding base64 string (encoded by other app from a file) without html file input form. Feb 21, 2017 · Buffer is NodeJS not Javascript – Nils Rückmann. toString('base64'); After you get the base64 file representation from db use the buffer as follows in order to convert it back to a file: var decodedFile = new Buffer(base64pdf, 'base64'); More information on Buffer Oct 14, 2020 · If you were to provide an example of the encoded data that doesn't work, that would make it easier to answer, rather than speculate. Apr 4, 2021 · Am trying to decode a base64 string containing an array buffer. toString('ascii') As far as it goes to your code, its not wrong base64 conversion is right, may be there can be issue in your temporary_user_id, because of that you are getting some awkward text but conversion is done right About. const buffer = Buffer. You can encrypt and decrypt your data by using provided methods. from() method takes a string as an input and converts it into Base64. The btoa() function and Buffer. Aug 29, 2014 · To reconvert the resulting decryptedWordArray to an ArrayBuffer, the simplest approach would probably be, to first convert it to a Base64-String (as discussed here) and then decode that String to the desired ArrayBuffer (see here). mido. Data URLs are structured data:[<mediatype>][;base64],<data>, so we split that url at the comma and return only the base64 encoded characters. Result. toString('base64') and to decode it just use. enc. Start using base64-arraybuffer in your project by running `npm i base64-arraybuffer`. Anyways, buffer. This nitpick passed, there are many methods to do the same as this code in a browser. Unicode 文字列も結果的にバイナリデータとして扱うため、バイナリデータを Base64 エンコードする方法を先に説明します。. Isomorphic—it can be used in, both, Node and the browser. encodeURI (): This encodeURI () function is used to encode a URI. // Uma string qualquer var string = 'DevPleno' // Convertendo para Base64 var emBase64 = btoa( string) console. 0. js can be used to convert a string to a series of bytes. Data truncation may occur when decoding strings that do not exclusively consist of an even number of Node has native Base64 methods, but these either encode a buffer and return a string (buffer. Mar 8, 2023 · バイナリデータの場合. encode(a Buffer or Uint8Array) returns a String Base58. parse('SGVsbG8sIFdvcmxkIQ=='); var base64 = CryptoJS. The converted bytes can be changed again into String. The size of the Buffer is established when it is created and cannot be modified. js. Nov 4, 2016 · im working on a javascript/nodejs application that needs to talk with a C++ tcp/udp socket. The 29 bytes is made up of a number of fields; each with unique lengths. Something like this: context. varencodedStr ="SGVsbG9AV29ybGQ=";// Decode the StringvardecodedStr =atob(encodedStr);console. var words = CryptoJS. About. charCodeAt method for each character in the string. toString("base64"); Oct 16, 2023 · TypeScript/JavascriptでBase64のエンコードとデコードの方法です。 const decodedData = Buffer. The above function works flawlessly if the Base64 encoded input only had 8-bit bytes. from(b64string, 'base64'); // Ta-da For Node. Allowed image types: JPG, JPEG, PNG, GIF, BMP, TIFF, SVG - Max size: 10Mb. It is an array of bytes, often referred to in other languages as a "byte array". js using the Buffer object. Using atob () and btoa () in Javascript. On the other hand, converting a string into a Buffer is called encoding. js core Buffer API allows base64 encoding for cases like Basic authentication. log ( base64 Feb 15, 2017 · NodeJS: How to decode base64 encoded string back to binary? In node 5. stringify({"hello":"world"},undefined,n)). JS to pass along to the PostageApp API as an attachment. js v5. Moreover, Buffer objects are immutable. So it may be used for APIs, not for client side code. btoa() goes from a string to a base64-encoded string, and atob() decodes back. Try roundtripping this, and you'll see it works fine: decodeURIComponent(escape(unescape(encodeURIComponent("東京")))) "東京", even thought the intermediate result looks like funny characters--because it IS funny characters. Feb 24, 2011 · Otherwise binary just works fine, although there's the UTF-8 encode/decode overhead in the protocol, but that's always there. Jul 5, 2020 · var processImageBuffer = new ArrayBuffer(image); // convert image to buffer array var blob = new Blob(image); // convert buffer array to promise array var processImageBuffer = blob. So: Buffer("Man","utf8") means "Create a buffer with the input "Man", and decode that input for internal storage as if the bytes are utf8 encoded". Jun 3, 2024 · Window: btoa () method. After converting image, you can download this as png file / picture. Decoding a base64-encoded string is also possible using the global Buffer class. parse(decodedRequestBodyString. buffer; base64; base64-decode Apr 8, 2020 · In JavaScript, these are the functions respectively for encoding and decoding Base64 strings and URL. When the term "Base64" is used on its own to refer to a specific algorithm, it typically refers to When creating a Buffer from a string, this encoding will also correctly accept regular base64-encoded strings. So I want to convert a base64 string to the javascript file object like that. Formatters (like Base64 and Utf8) are interfaces between this WordArray format, and strings, which may contain data encoded in any format. from (), the toString () function gives you the original In JavaScript, it is possible to use Base64 to encode and decode strings. The file content seems to be the correct content with all kinds of gibberish interspersed. Be mindful of character encoding: Base64 encoding is a binary-to-text encoding scheme, which means it can handle any binary data. result)) because i want to capture the base64 as a variable (and then send it to Google Apps Script). The cleanest is to first decode this base64 string in an ArrayBuffer and then read that ArrayBuffer as string, just like your node code: Aug 30, 2017 · 226 1 6. from(serialized, "base64"); console. So if the final unit of the encoded byte data only has two or three Base64 Apr 21, 2014 · Anyone know of a good snippet of JavaScript code to convert HEX encoded strings to base64 encoded strings? var hexString = Buffer. toString()); Base64 is commonly used in a number of applications including email via MIME, and storing complex data in XML. Nov 20, 2018 · Consequently, I thought about checking the result of a base64 decode instead of what I pass into the base64 decode. See full list on stackabuse. Buffer is a storage type that uses dynamic heap and is used for ensuring conversion standards ( IPCs can be encoded in utf-8, however if you start utilizing Sockets or network packets then Feb 1, 2022 · 7. Faster than the Node's implementation for short blobs, smaller than 40 bytes. CONVERT STRING TO IMAGE. 1 and below. This only works if base64encoded is a string. write() - third argument is not length, it is end offset - no, for write it is a length - see documentation - you could actually do buffer. Therefore, if you are not sure that your Base64 string is an image, use the Base64 to file converter since it is capable of displaying various file types. What I am trying to do: I want to check against 쭅 and similar output of buffer A simple Base64 encode / decode function for JavaScript supports UTF-8 encoding. You may want to file a bug on Node for buffer copying which copies in the specified encoding. This tool helps to convert base64 string / text to image. Base-58 module has the below explanation but I can't exactly understand how to convert my message. Jun 30, 2016 · Basically the Buffer class represents byte streams, it's only when you convert it from/to strings that encoding comes into context. This Base64 data can then be embedded directly into an HTML image tag, allowing the image to be displayed within the web page without linking to an external file. btoa (): This function uses the A-Za-z0-9+/= characters to encode the string in Base64. Javascript contains a built-in function called window. parse the code needs to invoke Buffer. toString('base64')); SGVsbG8gV29ybGQ= > console. packer. Jan 29, 2013 · As of Node. map(function(c) { return c. Again, create a buffer instance using the Buffer. The most common encoding is the "base64"encoding defined in RFC 4648and used in MIME (RFC 2045) and PEM(RFC 1421). from('hey there', 'base64'); let bufferResult = buffer. from (str, 'base64') andbuf. base64 is a style of storing information (where 6 bits encode your information). Printf("base64: %s\n", base64Text[:l]) Aug 19, 2023 · In Node. The following shows a quick example: // A really plain string that is just code points below 128. If it's already a buffer you get the same encoded value out as what went in. All decoding is done locally via JavaScript. Base64 エンコード を行う btoa 関数は文字列を引数として渡しますが、その 文字列の文字 1 Oct 14, 2023 · Base64 is efficient and perfect for data consistent. It seems like I get from the old C++ clients an utf16 buffer. This class provides three different encoders and decoders to encrypt information at each level. from(JSON. toString(); We're just extracting the ArrayBuffer from the Uint8Array and then converting that to a proper NodeJS Buffer. You should instead use buffer. log(decodedStr);// Hello@World. This method takes two parameters, a plain-text string, and the character encoding, and creates a buffer or binary data array for the given encoding. In any case, feel free to give it a try, since this Nov 29, 2015 · The encoding you pass in tells the Buffer object that the byte sequence you also gave it uses that encoding. Apr 9, 2024 · Implements Base64 encoding algorithm compatible with Node's Buffer. from method. util. Encode(buf, []byte("test")) fmt. from (encodedData, 'base64url'). The best way to serialize a buffer in plaintext is probably to convert it to base64: const buf = Buffer. 2, last published: 2 years ago. Apr 10, 2019 · The “Base64 to Image” converter will force the decoding result to be displayed as an image, even if it is a different file type. from(await blob. js APIs, converting between base64-encoded strings and binary data should be performed using Buffer. JavaScript provides a built-in method for this purpose called btoa() for encoding binary data as Base64. Then we convert the Buffer to a string (you can throw in a hex or base64 encoding if you want). If we want to convert back to a Uint8Array from a string, then we'd do this: May 30, 2018 · For code running using Node. Base64 encode your data without hassles or decode it into a human-readable format. The term Base64 originates from a specific MIME content transfer encoding. const requestBodyObject = JSON. The code: let buffer = Buffer. This can be done using the Buffer. The notable ones are UTF-8, UTF-16, and base64. Jul 9, 2019 · I was also trying to decode a large image. To accomplish this, JavaScript provides the Buffer. You need to import java. Commented Jul 11, 2022 at 12:05. I thought I had it working but it attaches a 1K file that isn't exactly what I was looking for. toString("base64") method assume the string is in UTF-8 encoding by default. from is an instance of Buffer. 11. I tried many libraries and solutions provided on SO, but I'm still unable to decode the image correctly. from(string, [encoding]) object. This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045. This tool helps you to convert your Base64 String to image with Ease. 3. Base64 encoding tool supports loading the Base64 text File to transform to Image. First, you'll need to install the request module using npm: Mar 11, 2016 · 'file' variable is a javascript file object. result from the getBase64() function (rather than using console. toString('utf-8'); console. It's usually used for image to binary conversion (and encoding decoding). That’s why you should make your base64 string URL safe. – user663031. from("4pyTIMOgIGxhIG1vZGU=", "base64"). 'hex': Encode each byte as two hexadecimal characters. After decoding all am getting is a string showing [object ArrayBuffer]. js, you can use the Buffer class to encode and decode Base64 data without the need for the btoa() and atob() functions. , a string in which each character in the string is treated as a byte of binary data). stringify(msgBody)). In the result field you will see your image, MIME type, and actual size. In the same vein, you can do binary to text encoding using base64, hex, or base64url. So for your above code you would use this to get your image as You can decode any Base64 encoded data using the built-in Buffer API provided by Node. js, converting an image URL to Base64 can be achieved using the request module along with the built-in Buffer class. e. height); Make sure that your base64 string starts with the data:image/gif;base64, part. toString(encoding) Parameters. log(Buffer. toString('binary') const decodedData = Buffer(fileDataProcessed, 'base64') // This is the code that you can now upload to your s3 bucket, or somewhere else. width, canvas. Aug 6, 2023 · This process is known as decoding Base64 to Buffer. Buffer objects are similar to arrays of integers from 0 to 255. from("Hello World"). Construct a new Buffer and pass 'base64' as the second Apr 5, 2020 · Where I need to convert the array buffer in this code to be converted to base64, and in order to test if the base64 is indeed correct I need to convert the base64 back to arrayBuffer and then feed that into the sourceBuffer for display. Base58. charCodeAt(0); })); If you have very large array buffers then the apply may fail with Maximum call stack size exceeded and you may need to chunk the buffer (based on the one posted by @RohitSengar). For a simple PDF, such as this one, with a base64 encoded string representation like this, the code above works and the PDF can be read in any PDF viewer. There are 458 other projects in the npm registry using base64-arraybuffer. You can use this method to encode data which may otherwise cause communication problems, transmit it, then use the Window. js Encoding // plain-text string const str = 'This will be encoded in base64' ; // create a buffer const buff = Buffer . Under the hood, the Buffer handles all the binary to base64 mapping and conversion for you. toString() Edit: For client-side usage without the browserify module I recommend you to use this package. mp be dl vr gt fw vf pe tv lj