I am having trouble generating command regarding following json file I have - json

Question

This is how my json file looks
"Patient":{
"Name":{
"Patient First Name":"James",
"Patient Middle Name":"Adam",
"Patient Last Name":"Manchester"
},
"Unique ID":163983,
"Demographics":{
"Sex":"M",
"Birthdate":"7/24/1940"
},
"IntakeCriteria":{
"DmDxDate":"8/25/2012",
"InitialHgbA1c":8.1,
"Comorbidity":["Diabetes Mellitus","CHF","DVT"]
},
"Labs":{
"LDLCholesterol":{
"LDLResultDate":"5/6/2013",
"LDLLevel":200
},
"SerumCreatinine":{
"CreatinineResultDate":"11/1/2016",
"CreatinineLevel":0.9
}
},
"CareLocation":{
"Facility Name":"East Side Clinic",
"Facility Contact Name":"Mary Silverman",
"Facility Contact Phone":"618-348-1891"
}
}
}
I need to prepare a query using the following fields:
Patient Unique ID number.
Patient First Name.
Patient Last Name.
Lab Test Date.
HgbA1c Level.
LDL Level.
Creatinine Level.
I tried this resulting in no result
jq - r’[.Patient.UniqueID, .Patient.Name.FirstName, .Patient.Name.LastName, .Patient.Labs.LDLCholesterol.LabResultDate, .Patient.IntakeCriteria.InitialHgbA1c, .Patient.Labs.LDLCholesterol.LDLLevel, .Patient.Labs.SerumCreatine.CreatineLevel] | #csv’ data.json > csvtest.out

Answer 1

When using object identifiers, you have to provide the field names exactly as used in the JSON file. Also, if they contain special characters such as white spaces (or start with a digit), surround them with double quotes for clarification:
jq -r '[
.Patient."Unique ID",
.Patient.Name."Patient First Name",
.Patient.Name."Patient Last Name",
.Patient.Labs.LDLCholesterol.LDLResultDate,
.Patient.IntakeCriteria.InitialHgbA1c,
.Patient.Labs.LDLCholesterol.LDLLevel,
.Patient.Labs.SerumCreatinine.CreatinineLevel
] | #csv' data.json > csvtest.out
163983,"James","Manchester","5/6/2013",8.1,200,0.9
Demo
To shorten your filter a bit, you may also group together some of the paths sharing common parents using subfilters with pipes | within a grouping with parentheses ():
jq -r '[.Patient |
."Unique ID",
(.Name | ."Patient First Name", ."Patient Last Name"),
.Labs.LDLCholesterol.LDLResultDate,
.IntakeCriteria.InitialHgbA1c,
(.Labs | .LDLCholesterol.LDLLevel, .SerumCreatinine.CreatinineLevel)
] | #csv' data.json > csvtest.out
163983,"James","Manchester","5/6/2013",8.1,200,0.9
Demo