I have done some searching and I gather that the issue may be down to a new line character that is being handled different locally vs on heroku but I am not sure where or how to deal with that.
I have a pretty basic app that needs to base64 encode a string.
The code is pretty basic node code
let buff = new Buffer(cics);
let base64data = buff.toString('base64');
Here are the results, they are similar, only different by the "YQ=="
Local
MzQ0YzAxOWMtMWZhMC00ODU0LTlhMjMtOWNiNmYzYTdmMzNkOjlhZThhMWUwLTg2OWItNDg2Yi1iNzFkLWRkMGM1NGQ3NWFhYQ==
Heroku
MzQ0YzAxOWMtMWZhMC00ODU0LTlhMjMtOWNiNmYzYTdmMzNkOjlhZThhMWUwLTg2OWItNDg2Yi1iNzFkLWRkMGM1NGQ3NWFh
Anyone know what could be going on here?
Well, decode them and take a look.
$ echo 'MzQ0YzAxOWMtMWZhMC00ODU0LTlhMjMtOWNiNmYzYTdmMzNkOjlhZThhMWUwLTg2OWItNDg2Yi1iNzFkLWRkMGM1NGQ3NWFhYQ==' | base64 -d | hexdump -C 00000000 33 34 34 63 30 31 39 63 2d 31 66 61 30 2d 34 38 |344c019c-1fa0-48| 00000010 35 34 2d 39 61 32 33 2d 39 63 62 36 66 33 61 37 |54-9a23-9cb6f3a7| 00000020 66 33 33 64 3a 39 61 65 38 61 31 65 30 2d 38 36 |f33d:9ae8a1e0-86| 00000030 39 62 2d 34 38 36 62 2d 62 37 31 64 2d 64 64 30 |9b-486b-b71d-dd0| 00000040 63 35 34 64 37 35 61 61 61 |c54d75aaa| 00000049
$ echo 'MzQ0YzAxOWMtMWZhMC00ODU0LTlhMjMtOWNiNmYzYTdmMzNkOjlhZThhMWUwLTg2OWItNDg2Yi1iNzFkLWRkMGM1NGQ3NWFh' | base64 -d | hexdump -C 00000000 33 34 34 63 30 31 39 63 2d 31 66 61 30 2d 34 38 |344c019c-1fa0-48| 00000010 35 34 2d 39 61 32 33 2d 39 63 62 36 66 33 61 37 |54-9a23-9cb6f3a7| 00000020 66 33 33 64 3a 39 61 65 38 61 31 65 30 2d 38 36 |f33d:9ae8a1e0-86| 00000030 39 62 2d 34 38 36 62 2d 62 37 31 64 2d 64 64 30 |9b-486b-b71d-dd0| 00000040 63 35 34 64 37 35 61 61 |c54d75aa| 00000048
Notice that Heroku is encoding a buffer that's one byte shorter (missing the final letter a) – or its Base64 encoder is buggy and discards incomplete chunks instead of correctly using padding.
(As a shortcut, because Base64 output always consists of 4-character chunks, you can decode just the YQ== on its own. It indeed decodes to the letter a.)
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