I have a JSON with lots of empty content:
{
"items": [
{
"category": "login",
"fields": [
{
"label": "Name",
"value": "",
},
{
"label": "E-Mail",
"value": "",
},
{
"label": "Password",
"value": "123456",
},
{
"label": "Website",
"fields": [
{
"label": "Name X",
"value": ""
},
{
"label": "Name Y",
"value": "another one"
},…
]
},…
]
},…
]
}
The nesting goes several levels deeper. This shows only the first level. I want to delete all elements of "fields" (or whatever the array's key in deeper levels is), where their "value" is empty.
{
"items": [
{
"category": "login",
"fields": [
{
"label": "Password",
"value": "123456",
},
{
"label": "Website",
"fields": [
{
"label": "Name Y",
"value": "another one"
},…
]
},…
]
},…
]
}
How can I do this in Javascript?
Well, I found a way to iterate through the JSON object:
function remove(jsondata) {
for (let i in jsondata) {
if (jsondata[i].value != undefined && jsondata[i].value == '') {
delete jsondata[i];
}
else if (typeof jsondata[i] === "object") remove(jsondata[i]);
}
}
Not sure, if it's the most elegant way, but it works so far.
use filter
method,you could get a filtered array
it returned Boolean
. if value
exist,it will be true
var list=JSON.parse(data)
list.items=list.items.map(val=>{
val.fields=val.fields.filter(v=>v.value})
return val
})
We use object-scan for many data processing tasks. It's powerful once you wrap your head around it. Here is how you could answer your questions
// const objectScan = require('object-scan'); const prune = (input) => objectScan(['**[*].value'], { rtn: 'count', filterFn: ({ gparent, gproperty, value }) => { if (value === '') { gparent.splice(gproperty, 1); return true; } return false; } })(input); const obj = { items: [{ category: 'login', fields: [{ label: 'Name', value: '' }, { label: 'E-Mail', value: '' }, { label: 'Password', value: '123456' }, { label: 'Website', fields: [{ label: 'Name X', value: '' }, { label: 'Name Y', value: 'another one' }] }] }] }; console.log(prune(obj)); // return count of pruned entries // => 3 console.log(obj); // => { items: [ { category: 'login', fields: [ { label: 'Password', value: '123456' }, { label: 'Website', fields: [ { label: 'Name Y', value: 'another one' } ] } ] } ] }
.as-console-wrapper {max-height: 100%;important: top: 0}
<script src="https://bundle.run/object-scan@16.0.0"></script>
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