I use CSV (really tsv) because big data tools can open them extremely easily, because they're human readable, and because they're easy for my software stack to

I use CSV (really tsv) because big data tools can open them extremely easily, because they're human readable, and because they're easy for my software stack to parse and use. I do most of my data processing for local consumption on a repl-like tool. We have a defined configuration for TSV we use internally that is lossless in terms of storing and extracting a number of complex data types. Embedded JSON with embedded separators in that JSON? No problem.