fastqstream

fastqstream is a Stream transform for parsing FASTQ files into records.

Usage

var fs = require('fs')

var reader = fs.createReadStream('file.fq')

reader.pipe(new FASTQStream())
      .on('data', function (data) {
	    console.log(data)
	  })

Available transforms

There are two transforms available:

• FASTQStream takes a String or Buffer and convert into Records (as objects). It does some basic validation on the syntax, but doesn't try to verify if quality scores are valid, for example.
• FASTQValidator implements more strict validation, such as checking that no sequence in the original FASTQ has the same id as other sequences.

Alternatives

I checked for FASTQ parsers on NPM but none had all the features that I wanted. They are all very interesting, but I wanted something that works on any stream and is agnostic about nodejs or browser. Most of them implement the parser as a Readable stream (expecting a path, which it then opens with fs), but I think it is better to implement it as a Transform and consume data from whatever is piping data in.

• https://www.npmjs.com/package/fasta-tools
• https://www.npmjs.com/package/fqreader
• https://www.npmjs.com/package/bionode-fastq
• https://www.npmjs.com/package/streaming-sequence-extractor Focuses on GenBank files, but many nice ideas here.

License

BSD 3-clause