Use the array filter function to get the JSON value for the key in JavaScript.
Example JSON get value by key in JavaScript
Simple example code gets value for a key from nested JSON object in JavaScript.
<!DOCTYPE html>
<html>
<head>
<script>
const obj = {
"prop": [
{
"key": "FOO",
"value": "Foo is wonderfull, foo is great"
},
{
"key": "BAR",
"value": "Bar is bad, really bad"
}
]
};
const arr = obj['prop'];
const result = arr.filter(el => {
return el['key'] === "BAR";
});
console.log(result[0].value)
</script>
</head>
</html>
Output:
JavaScript function that takes in one such object as the first argument, and a key string as the second argument.
const findByKey = (obj, key) => {
const arr = obj['prop'];
if(arr.length){
const result = arr.filter(el => {
return el['key'] === key;
});
if(result && result.length){
return result[0].value;
}
else{
return '';
}
}
}
console.log(findByKey(obj, 'BAR'));Do comment if you have any doubts or suggestions on this JS JSON code.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version