How to implement point-to-point routing using GeoJSON database?

Question

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Hello.
There is a base (polyline map) of routes in GeoJSON format.
Interested in the best way to implement the search for the nearest path on the server side.
Interested in finding the nearest road on which the bus / minibus passes to the nearest stop to the end point. Also, it is desirable to implement the possibility of transfers to other routes if one route is not found.
Two days of googling did not give anything, there are only ready-made services and APIs that do not provide data for the necessary cities.
I have an idea of ​​how to implement this idea myself, but you never know, there are ready-made solutions. I do not want to create a crooked bike.
Thanks to.

Answer 1

I don't know what I googled there, but it would be worth 'postgis route planning'