Trim padding - window.atob might handle trimmed strings, e.g. Over my node. Buffer objects are similar to arrays of integers from 0 to 255. This can be done using the om () method that accepts the string to be converted and the current encoding of the string. You can decode any Base64 encoded data using the built-in Buffer API provided by Node.js. Encoding the original string to base64: The Buffer class in Node.js can be used to convert a string to a series of bytes. Returns String, base64 encoded trim(string) Base64 encoding and decoding can be done in Node.js using the Buffer object. But the file isn't a valid image file, and the 'file' utility s. Returns String, url-safe-base64 encoded decode(safe) My Express app is receiving a base64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. This can be done using the om () method that accepts the string to be converted and the current encoding of the string. Pure JS - no string middlestep (no atob) I write following function which convert base64 in direct way (without conversion to string at the middlestep). Import from 'url-safe-base64' const safe = encode ( 'A/B+C=' ) // > 'A-B_C=' trim ( safe ) // > 'A-B_C' const base64 = decode ( safe ) // > 'A/B+C=' isBase64 ( base64 ) // > true isBase64 ( safe ) // > false isUrlSafeBase64 ( base64 ) // > false isUrlSafeBase64 ( safe ) // > true API encode(base64) Base64 encoding and decoding can be done in Node.js using the Buffer object.
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