# Is there a standard k-mer count file format?

I am doing a research project involving calculating k-mer frequencies and I am wondering if there is any standard file format for storing k-mer counts.

Not as far as I am aware. The Ray assembler used to (and possibly still does) store the kmers as FASTA files where the header was the count of the sequence, which I thought was a pretty neat bastardisation of the FASTA file format. It looks like this format is also used by Jellyfish when reporting kmer frequencies by the dump command (but its default output format is a custom binary format):