constfs=require('fs')constzlib=require('zlib')conststrs=require('stringstream')constutf8Stream=fs.createReadStream('massiveLogFile.gz').pipe(zlib.createGunzip()).pipe(strs('utf8'))utf8Stream.on('data',str=>console.log(`This will be a string: ${str}`))

• strs(to, [options]) – creates a transform stream that converts the input into strings in to encoding (eg, utf8, hex, base64)
• strs(from, to, [options]) – creates a transform stream converts the input from strings in from encoding to strings in to encoding

options can be anything compatible with the standard Node.js new stream.Transform([options]) constructor

Back in the day, calling .setEncoding('base64') on a readable stream didn't align correctly, which was one of the main reasons I wrote this library – however this hasn't been the case for a long time, so this library is now really only useful in scenarios where you don't want to call .setEncoding() for whatever reason.

It also handles input and output text encodings:

// Stream from utf8 to hex to base64... Why not, ay.consthex64Stream=fs.createReadStream('myFile.txt').pipe(strs('utf8','hex')).pipe(strs('hex','base64'))

Also deals with base64 output correctly by aligning each emitted data chunk so that there are no dangling = characters:

conststream=fs.createReadStream('myFile.jpg').pipe(strs('base64'))letbase64Str=''stream.on('data',data=>base64Str+=data)stream.on('end',()=>{console.log('My base64 encoded file is: '+base64Str)console.log('Original file is: '+Buffer.from(base64Str,'base64'))})