Encoding Text to Base64 and decoding back to JSON - node.js

Question

I am trying to encode a text to Base64 and using NodeJS, and then while getting the data I am decoding it back from Base64. Now I need to change the data into JSON so I could fill the relevant fields but its not converting to JSON.
Here is my code:
fs.readFile('./setting.txt', 'utf8', function(err, data) {
if (err) throw err;
var encodedData = base64.encode(data);
var decoded = base64.decode(encodedData).replace(/\n/g, '').replace(/\s/g, " ");
return res.status(200).send(decoded);
});
In setting.txt I have the following text:
LENGTH=1076
CRC16=28653
OFFSET=37
MEASUREMENT_SAMPLING_RATE=4
MEASUREMENT_RANGE=1
MEASUREMENT_TRACE_LENGTH=16384
MEASUREMENT_PRETRIGGER_LENGTH=0
MEASUREMENT_UNIT=2
MEASUREMENT_OFFSET_REMOVER=1
This decodes the result properly but when I use JSON.parse(JSON.stringify(decoded ) its not converting to JSON.
Can someone help me with it.

Answer 1

Try below snippet
let base64Json= new Buffer(JSON.stringify({}),"base64").toString('base64');
let json = new Buffer(base64Json, 'ascii').toString('ascii');

Answer 2

What does base-64 encoding/decoding have to do with mapping a list of tuples (key/value pairs) like this:
LENGTH=1076
CRC16=28653
OFFSET=37
MEASUREMENT_SAMPLING_RATE=4
MEASUREMENT_RANGE=1
MEASUREMENT_TRACE_LENGTH=16384
MEASUREMENT_PRETRIGGER_LENGTH=0
MEASUREMENT_UNIT=2
MEASUREMENT_OFFSET_REMOVER=1
into JSON?
If you want to "turn it (the above) into JSON", you need to:
Decide on what its JSON representation should be, then
Parse it into its component bits, convert that into an appropriate data struct, and then
use JSON.stringify() to convert it to JSON.
For instance:
function jsonify( document ) {
const tuples = document
.split( /\n|\r\n?/ )
.map( x => x.split( '=', 2) )
.map( ([k,v]) => {
const n = Number(n);
return [ k , n === NaN ? v : n ];
});
const obj = Object.fromEntries(tuples);
const json = JSON.stringify(obj);
return json;
}