Tips for extracting the most deeply nested object in a JSON file using JavaScript

Question

Tips for extracting the most deeply nested object in a JSON file using JavaScript

Is it possible to access the innermost object without knowing the path names?

Consider this JSON example:

 const data = {
            first: {
               second: {
                  third: {innerObject}
                       }
                    }
                  }

Each level will only have one value, but there can be up to 5 levels of nesting.

Is there a way to always reach the inner object without using explicit paths like data.first.second.third?

Please note that the inner object will always have consistent keys.

javascript json

Answer 1

Answer №1

Utilize a recursive method for searching

Ensure that the object aligns with the key template designated for a response object ("the response object will consistently have the same keys")
If it matches, you have discovered the response object and can return it
If not, conduct another search using the value of the first object (as "the levels will always only contain 1 value")
If any level of the search encounters a non-object, terminate the process

const response = {
  level1: {
    level2: {
      level3: {
        I: "am",
        a: "response object"
      }
    }
  }
}

const responseObjectKeyTemplate = (["I", "a"]).sort().join(",")
const isResponseObject = (obj) =>
  Object.keys(obj).sort().join(",") === responseObjectKeyTemplate
  
const searchLevel = (obj) => {
  if (typeof obj !== "object") {
    return null // not an object, bail
  }
  if (isResponseObject(obj)) {
    return obj // found it
  }
  
  // BWAAAAAAA (Inception pun)
  return searchLevel(Object.values(obj)[0])
}

console.log(searchLevel(response))

Answer 2

Utilize a recursive method for searching

Ensure that the object aligns with the key template designated for a response object ("the response object will consistently have the same keys")
If it matches, you have discovered the response object and can return it
If not, conduct another search using the value of the first object (as "the levels will always only contain 1 value")
If any level of the search encounters a non-object, terminate the process

const response = {
  level1: {
    level2: {
      level3: {
        I: "am",
        a: "response object"
      }
    }
  }
}

const responseObjectKeyTemplate = (["I", "a"]).sort().join(",")
const isResponseObject = (obj) =>
  Object.keys(obj).sort().join(",") === responseObjectKeyTemplate
  
const searchLevel = (obj) => {
  if (typeof obj !== "object") {
    return null // not an object, bail
  }
  if (isResponseObject(obj)) {
    return obj // found it
  }
  
  // BWAAAAAAA (Inception pun)
  return searchLevel(Object.values(obj)[0])
}

console.log(searchLevel(response))

Tips for extracting the most deeply nested object in a JSON file using JavaScript

Answer №1

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