How to download and setup grape-jsonapi
Open terminal and run command
                                            git clone https://github.com/EmCousin/grape-jsonapi.git
                                        
                                        git clone is used to create a copy or clone of grape-jsonapi repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with grape-jsonapi https://github.com/EmCousin/grape-jsonapi/archive/master.zip
Or simply clone grape-jsonapi with SSH
                                            [email protected]:EmCousin/grape-jsonapi.git                                    
                                    If you have some problems with grape-jsonapi
You may open issue on grape-jsonapi support forum (system) here: https://github.com/EmCousin/grape-jsonapi/issuesSimilar to grape-jsonapi repositories
Here you may see grape-jsonapi alternatives and analogs
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