Loading and converting json file in R - json

Question

I have .json file which I need to load in R and perform further operations with it after converting it into a data-frame. Initials of my json file looks like this:
{"_id":{"$oid":"57a30ce268fd0809ec4d194f"},"session":{"start_timestamp":{"$numberLong":"1470183490481"},"session_id":"def5faa9-20160803-001810481"},"metrics":{},"arrival_timestamp":{"$numberLong":"1470183523054"},"event_type":"OfferViewed","event_timestamp":{"$numberLong":"1470183505399"},"event_version":"3.0","application":{"package_name":"com.think.vito","title":"Vito","version_code":"5","app_id":"7ffa58dab3c646cea642e961ff8a8070","cognito_identity_pool_id":"us-east-1:4d9cf803-0487-44ec-be27-1e160d15df74","version_name":"2.0.0.0","sdk":{"version":"2.2.2","name":"aws-sdk-android"}},"client":{"cognito_id":"us-east-1:2e26918b-f7b1-471e-9df4-b931509f7d37","client_id":"ee0b61b0-85cf-4b2f-960e-e2aedef5faa9"},"device":{"locale":{"country":"US","code":"en_US","language":"en"},"platform":{"version":"5.1.1","name":"ANDROID"},"make":"YU","model":"AO5510"},"attributes":{"Category":"120000","CustomerID":"4078","OfferID":"45436"}}
Above sample is just one id, session, metrics and there are many like that.
I tried converting it using rjson library in R as follows. events_jason is the filename:
library(rjson)
result <- fromJSON(file = "events_json.json")
print(result)
$`_id`
$`_id`$`$oid`
[1] "57a30ce268fd0809ec4d194f"
$session
$session$start_timestamp
$session$start_timestamp$`$numberLong`
[1] "1470183490481"
$session$session_id
[1] "def5faa9-20160803-001810481"
$metrics
list()
$arrival_timestamp
$arrival_timestamp$`$numberLong`
[1] "1470183523054"
$event_type
[1] "OfferViewed"
$event_timestamp
$event_timestamp$`$numberLong`
[1] "1470183505399"
$event_version
[1] "3.0"
$application
$application$package_name
[1] "com.think.vito"
$application$title
[1] "Vito"
$application$version_code
[1] "5"
$application$app_id
[1] "7ffa58dab3c646cea642e961ff8a8070"
$application$cognito_identity_pool_id
[1] "us-east-1:4d9cf803-0487-44ec-be27-1e160d15df74"
$application$version_name
[1] "2.0.0.0"
$application$sdk
$application$sdk$version
[1] "2.2.2"
$application$sdk$name
[1] "aws-sdk-android"
$client
$client$cognito_id
[1] "us-east-1:2e26918b-f7b1-471e-9df4-b931509f7d37"
$client$client_id
[1] "ee0b61b0-85cf-4b2f-960e-e2aedef5faa9"
$device
$device$locale
$device$locale$country
[1] "US"
$device$locale$code
[1] "en_US"
$device$locale$language
[1] "en"
$device$platform
$device$platform$version
[1] "5.1.1"
$device$platform$name
[1] "ANDROID"
$device$make
[1] "YU"
$device$model
[1] "AO5510"
$attributes
$attributes$Category
[1] "120000"
$attributes$CustomerID
[1] "4078"
$attributes$OfferID
[1] "45436"
But it's just showing/reading the first row as I mentioned above. There are other more ids, session, metrics,event_type,etc which it is not showing.
Please help how can i read my whole json file so that i can see other rows as well and covert it into a proper data frame.
UPDATE:
I have found the solution. Using ndjson package I am getting desired data frame.
library(ndjson)
df<-ndjson::stream_in('events_data.json')

Answer 1

Your file is not a single json object, but rather a list of json obejcts, one for each line. You have to read each line and convert each one from json.
One way to do that is:
d <- lapply(strsplit(readLines("events_data2.json"),"\n"), fromJSON)
Hope this helps