Related and definitely worth checking out is miller[0] which the author describes as "like awk, sed, cut, join, and sort for name-indexed data such as CSV, TSV, and tabular JSON"

[0]: https://github.com/johnkerl/miller

This looks interesting, but:

1. when you go there, it loads a sample 170,000 row file automatically. Can that be disabled? Maybe add a "Load Sample" button...

2. on mobile, the hamburger menu items ("Read more" and "About") don't work

3. the default SQL is "LIMIT 1000", but only 500 rows show up

4. it'd be nice to be able to press Ctrl+Enter (or some shortcut) instead if clicking "Run query"

5. does it support JSON nested objects? eg [{"profile":{"firstName":"Gabriel"}}]

Tools do exist actually

- Tad does this for CSV, and much more, like pivots

- XLS can be natively queried with SQL with many tools, for example dbeaver

- I am not aware of JSON tool, but this is trivially achievable with postgresql by just adding json as only field in the table and then using SQL to query it, even index it.

No single tool tho, but you can easily automate any of the above via script and have it locally, without browser which is instant show stopper for any serious work.

    choco install tad dbeaver postgresql

Where do you store the files once uploaded?

Aww man website is down :(

Thanks for building this ;p

Awesome!