How to Get All Reviews of an App on Google Play Store? Is There Any Api? [Solved]

Yes, you can get all your reviews as a simple csv file. All you need to do is log into your Google Play Developer console and click on "Ratings & Reviews". Here you can download the csv. 
 

There's also an API. You can get more info on it here: Download & export monthly reports

Another Way to Get All Reviews of an App on Google Play Store

There are a few services that provide an API. Otherwise if this is about a handful of apps and you’re a developer you can write your own crawler or use existing ones (chadrem/market_bot). But if you don’t want to deal with all the issues that come with large scale crawling, then existing API services are probably the way to go. One of them is AppMonsta (I work there) and we collect all available reviews and ratings in Google Play store. You can get them through our API with just one line of code. We also do sentiment analysis on reviews to give you a better insight in what customers think.

Note:- This Article on Answer on How to get all reviews of an app on Google Play Store is Only Meant to Provide Information.