Exploring the variance between Go and TypeScript when it comes to solving base64 encoding

Here is an example of encoding and decoding using base64 in different languages:

In TypeScript: Buffer.from('Мегафон').toString('base64') //0JzQtdCz0LDRhNC+0L0=

In Go: 

decode, err := base64.URLEncoding.DecodeString("0JzQtdCz0LDRhNC+0L0=") //err : illegal base64 data at input byte 15

If we try to encode the same string in Go:

base64.URLEncoding.EncodeToString([]byte("Мегафон")) //0JzQtdCz0LDRhNC-0L0=

The only difference between the two encodings is the use of + and -.

I attempted a simple solution by replacing + with - using:

v = strings.ReplaceAll(v, "+", "-")
, but this is not ideal.

typescriptgobase64

Answer №1

When comparing "standard" base64 encoding with URL-safe base64 encoding, it's important to note the differences. In Go, make sure to use base64.StdEncoding.DecodeString for normal base64 encoding instead of base64.URLEncoding.DecodeString.

Answer №2

You encrypted your data using standard base64 encoding and decrypted it using a URL-safe decoder. Make sure to refer to the base64.go file for more information.

// StdEncoding refers to the standard base64 encoding, as outlined in
// RFC 4648.
var StdEncoding = NewEncoding(encodeStd)

// URLEncoding is an alternative base64 encoding specified in RFC 4648.
// It is commonly used for URLs and file names.
var URLEncoding = NewEncoding(encodeURL)

This method will be effective.

base64.StdEncoding.DecodeString("0JzQtdCz0LDRhNC+0L0=")

If you prefer to encode your data for URLs safely, utilize base64url instead of base64. Then, you can decode the data with base64.URLEncoding.

 Buffer.from('Мегафон').toString('base64url'); //'0JzQtdCz0LDRhNC-0L0'

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