I am dealing with a complex JSON structure that requires pulling out specific information like this
let result = data["a"]["b"][0]["c"]["d"][0]["e"][0]
What is a streamlined approach to extract the data? Additionally, is it possible to assign the result to null or undefined if any of the keys (a,b,c,d,e) are missing or if the array does not have an element at index 0?
Utilize the newest version of Javascript by incorporating the optional chaining operator:
let output = info?.x?.y?.[0]?.z?.w?.[0]?.v?.[0]
If you need to access specific properties in an object, you can create a function called path:
undefined or the end of the specified path.const path = p => o =>
p.reduce( (res, pp) =>
res === undefined ? res : res[pp]
, o
);
const abcd = path(['a', 'b', 'c', 'd']);
console.log(abcd({}));
console.log(abcd({a: 1}));
console.log(abcd({a: {b: {}}}));
console.log(abcd({a: {b: {c: {d: 42}}}}));One possible solution could involve utilizing an optional chaining operator, but the recommended approach is to leverage a tool like JSONPath for this task.
There are various libraries available, such as jsonpath or jsonpath-plus, that offer similar functionalities.
JSONPath essentially serves as XPath for JSON data structures.
For instance, consider the following JSON example:
{ "store": {
"book": [
{ "category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
Here is an example of how you can extract the authors of all books in the store using a JSONPath expression:
$.store.book[*].author
You can implement this in JavaScript like so:
const o = { /*...*/ }, // the 'store' JSON object from above
res1 = jsonPath(o, "$..author").toJSONString(); // JSONPath expression for all authors
res2 = jsonPath(o, "$..author", {resultType:"PATH"}).toJSONString();
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