Thanks for sharing them! I added the two tools to https://github.com/severo/awesome-parquet (feel free to propose more resources!)
On Thursday, 30 October 2025 at 9:55 PM, Andrew Lamb <[email protected]> wrote: > > > Thanks for sharing Julien! > > I also wanted to point out another online viewer from Xiangpeng Hao that > lets you explore all the metadata (and data) as well[1] > > Andrew > > [1]: https://parquet-viewer.xiangpeng.systems/ > > > > On Thu, Oct 30, 2025 at 2:38 PM Arnav Balyan [email protected] wrote: > > > Thanks a lot for sharing! This will be really helpful for the FSST testing! > > > > On Thu, Oct 30, 2025 at 11:41 PM Curt Hagenlocher [email protected] > > wrote: > > > > > Thanks, this is great! It's something I'd long mused about creating but > > > never got to the point of setting pen to paper. > > > > > > On Thu, Oct 30, 2025 at 11:02 AM Julien Le Dem [email protected] > > > wrote: > > > > > > > I mentioned in the sync that I did a little Parquet file metadata > > > > visualizer. > > > > I wanted to have something to help people who are benchmarking Parquet > > > > and > > > > want to take a look at what the pages look like and verify that the > > > > choices > > > > on page size or encoding are not creating degraded performance. > > > > This is made with claude code and doubles as my personal > > > > experimentation > > > > with AI coding. > > > > Note that I don't really know typescript or front end development, so > > > > code > > > > quality may vary. > > > > Requirements: > > > > - run entirely in the browser. (It is using hyparquet!) > > > > - display the page metadata by iterating through the page headers for > > > > a > > > > given column chunk. > > > > - it is trying to be careful of memory usage, I have loaded 2GB+ > > > > Parquet > > > > files with many columns in it. > > > > https://github.com/julienledem/parquet-metadata-vizualizer > > > > I have published it here, if you want to play with it: > > > > https://julien.ledem.net/experiment/parquet-visualizer.html > > > > There is no backend. It is all running in your browser. > > > > Here is an example with the NY taxi data > > > > [image: Screenshot 2025-10-30 at 10.58.53 AM.png]
