JSON to R for Analysis of a file

Using the JSON file below, call it Home.JSON, how can we generate various visualizations in R depicting the historical overall spend and the same by project.

 [ { "accountId" : "00BAB0-FBE045-2A9ECF", "lineItemId" : "com.google.cloud/services/support/Gold", "startTime" : "2015-06-26T00:00:00-07:00", "endTime" : "2015-06-27T00:00:00-07:00", "measurements" : [ { "measurementId" : "com.google.cloud/services/support/Gold", "sum" : "253", "unit" : "USD" } ], "cost" : { "amount" : "253", "currency" : "USD" } }, { "accountId" : "00BAB0-FBE045-2A9ECF", "lineItemId" : "com.google.cloud/services/app-engine/DatastoreReadOps", "startTime" : "2015-06-29T00:00:00-07:00", "endTime" : "2015-06-30T00:00:00-07:00", "projectNumber" : "20221773448", "measurements" : [ { "measurementId" : "com.google.cloud/services/app-engine/DatastoreReadOps", "sum" : "0", "unit" : "requests" } ], "cost" : { "amount" : "0", "currency" : "USD" }