I have tried Metabase, Redash, Google DataStudio - all pretty complex tools.
I am an indie hacker, and have my product data in Mongo. Right now, I check it out in terminal. It would be good to have a visualisation tool to do that for me.
My criteria:
1. Simple to use 2. Should not keep crashing (Metabase for Mac sucks)
If nothing like this exists, do you think I should build one and open source it?
I think your best option would be to custom build some dashboards using some HTML and JS and some API that serialializes your data or if you need BI tool then either check out their bi-connector or maybe build some ETL workflow and save your data in Bigquery or something similar. From there it would be easy to use Metabase or something else to visualize your data.
I have used both of those as DB tools. Currently I have no Mongo databases and only use DataGrip, but I understand it supports Mongo pretty well and it is a decent tool. DataGrip isn't free but does have a free trial. Also, I believe there are a couple of different plug-ins for Visual Studio code that work with Mongo, but I don't use it so can't say how well etc.
* edit, sorry, just realized you said in browser, none of my suggestions are in-browser.
For the former, Robo 3T, as mentioned in sibling threads is probably the most popular free option.
For the latter, I haven't seen much but it looks like Mongo themselves have a tool called MongoDB Charts [1] for this.
https://www.holistics.io/blog/build-reporting-analytics-mong...
It has a free version you can possibly fit yourself into.