Delete empty and/or null values from a JSON - json

Question

Given the following message:
[{
"Name1": "Value1",
"Name2": [{
"Name2_1": [],
"Name2_2": [{
"Name2_2_1": "Value2_2_1"}]
}, {
"Name2_3": [{
"Name2_3_1": 12300}
],
"Name2_4": [{
"Name2_4_1": "Value2_4_1"}]
}],
"Name3": [{
"Name3_1": "Value3_1"
}]
}, {
"Name1": "Value1",
"Name2": [{
"Name2_1": 1234,
"Name2_2": [{
"Name2_2_1": "Value2_2_1"
}],
"Name2_3": []
}],
"Name3": []
}]
I want to remove all the empty and/or null values using the Groovy programming language.

Answer 1

The following code:
import groovy.json.*
def data = '''\
[
{
"Name1": "Value1",
"Name2": [
{
"Name2_1": [],
"Name2_2": [
{
"Name2_2_1": "Value2_2_1"
}
]
},
{
"Name2_3": [
{
"Name2_3_1": 12300
}
],
"Name2_4": [
{
"Name2_4_1": "Value2_4_1"
}
]
}
],
"Name3": [
{
"Name3_1": "Value3_1"
}
]
},
{
"Name1": "Value1",
"Name2": [
{
"Name2_1": 1234,
"Name2_2": [
{
"Name2_2_1": "Value2_2_1"
}
],
"Name2_3": []
}
],
"Name3": []
}
]'''
def json = new JsonSlurper().parseText(data)
json = recursivelyRemoveEmpties(json)
println(JsonOutput.prettyPrint(JsonOutput.toJson(json)))
def recursivelyRemoveEmpties(item) {
switch(item) {
case Map:
return item.collectEntries { k, v ->
[k, recursivelyRemoveEmpties(v)]
}.findAll { k, v -> v }
case List:
return item.collect {
recursivelyRemoveEmpties(it)
}.findAll { v -> v }
default:
return item
}
}
defines a recursive method recursivelyRemoveEmpties which removes empty and null values from arbitrary depth in the data structure. When executed this prints:
─➤ groovy solution.groovy
[
{
"Name1": "Value1",
"Name2": [
{
"Name2_2": [
{
"Name2_2_1": "Value2_2_1"
}
]
},
{
"Name2_3": [
{
"Name2_3_1": 12300
}
],
"Name2_4": [
{
"Name2_4_1": "Value2_4_1"
}
]
}
],
"Name3": [
{
"Name3_1": "Value3_1"
}
]
},
{
"Name1": "Value1",
"Name2": [
{
"Name2_1": 1234,
"Name2_2": [
{
"Name2_2_1": "Value2_2_1"
}
]
}
]
}
]
Tested on:
─➤ groovy -v
Groovy Version: 3.0.6 JVM: 15.0.2 Vendor: Amazon.com Inc. OS: Linux