reverse-geocoding | Reverse Geocoding for a Latitude and Longitude by Async | REST library

I have issues with reverse-geocoding. when I want to convert my coordinates to address, the Geocoder returns this error :

Caused by: java.io.IOException: grpc failed

this is my code :

I have read a lot of SO questions and answers and looked at the Mapbox documentation but I can't see a simple example of how to reverse geocode from a latitude/longitude point. The example only shows the URL to use to make a query but presumably there's a way to do it using the MapboxGeocoder object?

So, here, what would I use to display the reverse geocode for lat/long when the user clicks on the map?

I'm working with the here reverse-geocoding feature and with the code below the console prints an Object with all the information of my location. I'd like to just get the name of the city where I am. How can I do that?. Thank you! (In my code I've given a value to the "platform" variable.)

I'm using the places.js library for autocomplete, but also want to use it for reverse geocoding. According to https://community.algolia.com/places/examples.html#reverse-geocoding this should be possible - autocomplete is working fine, but not the reverse call. Code excerpt:

I'm trying to use the package reverse-geocoding https://www.npmjs.com/package/reverse-geocoding

The documentation I think isn't right because it gives me a the next error

TypeError: geocoding.location is not a function

my function is:

Is there a way to batch multiple reverse-geocoding requests on the Google Maps API?

I only see simple requests possible: https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&key=YOUR_API_KEY

I am trying to find the country name of a given location, for example lets say I know pennsylvania how do I find out automatically United States of America?

I found a couple of links for reverse geocoding like this one which gives me the full address on click on a map and this one which works while searching. The last one looks more promising as it uses nomination.

This is how I place a marker for pennsylvania.