我有以下json数据：
json_data <- data.frame(changedContent=c('{"documents":[],"images":[],"profileCommunications":[],"shortListedProfiles":[],"matrimonyUser":{"createdBy":null,"parentMatrimonyUserId":0,"userSalutationVal":"Mr.","matrimonyUserCode":"173773","matrimonyUserName":"SUDIPTO DEB BARMAN","emailAddress":"sudipto06@yahoo.com","contactNumber":"9434944429","emailOTP":"","mobilePhoneOTP":"","isEmailOTPVerified":1,"isMobilePhoneOTPverified":1,"isHideContact":null,"isHideEmail":null,"lastLogInTime":null,"userSessionDtlId":null,"modifiedBy":4444,"modifiedOn":1440167133028,"isDeleted":null,"isActive":1,"isAllowedLogin":null,"numberOfChildProfile":null,"matrimonyUserTypeId":100000006,"matrimonyUserTypeVal":"Online Customer","onlineStatusFlag":null,"lastSystemTransactionDateTime":null,"isLive":null,"mobileCountryCode":0,"userStatusIdValue":"Registered and 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ligionVal":"Hindu","motherTongueVal":"Bengali","marryOutsideCasteVal":"","isSocialMediaVerified":null,"numChildrenProspectVal":null,"locality":null},"profilePhysicalAttributesDtl":{"createdBy":4444,"userSessionDtlId":null,"modifiedBy":4444,"modifiedOn":1440167133110,"isDeleted":null,"isActive":1,"hivId":0,"bodyTypeId":0,"complexionId":0,"bloodGroupId":0,"userId":165614,"createdOn":1440167133110,"height":null,"isPreferredPartnerDtl":null,"hairColourId":0,"eyeColourId":0,"hairLengthId":0,"physicalStatusId":null,"disabilitiesVal":"","hivVal":"","knownAilmentVal":"","bodyTypeVal":null,"complexionVal":null,"hairColourVal":"","eyeColourVal":"","hairLengthVal":"","physicalStatusVal":null,"bloodGroupVal":null,"profilePhysicalAttributesDtlId":2757,"weight":null},"profileSiblingsDtl":null,"profileImageDtl":null,"notes":[{"createdBy":4444,"modifiedBy":4444,"modifiedOn":1440167133115,"isDeleted":null,"isActive":1,"userId":165614,"createdOn":1440167133115,"profileNotesDtlId":3499,"notesDescription":""}],"references":[],"relationOthers":[],"photoIdentificationDetails":null,"preModAboutMes":[{"answer":"null 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我想将上面的内容转换为一个方便的数据框，上面的每个MatrimonyUserId都有1行。我尝试过一些东西但是无法以所需的格式得到它。
答案 0 :(得分：0)
假设您可以将json数据纠缠到嵌套列表中....
x <- jsonlite::fromJSON(jsontext)
我发现使用管道运算符解析复杂的列表结构并经常检查结构（限制为1级或2级）是最容易的。
str1 <- function(x) str(x, 1)
str2 <- function(x) str(x, 2)
# for pipe operator
library("magittr")
x %>% str1
x %>% .[[1]] %>% str2
等