Leveraging JsonPath to retrieve data without prior knowledge of the key

Question

Leveraging JsonPath to retrieve data without prior knowledge of the key

I have a Json string that looks like the following:

  "files": {
     "fileA.c": {
         "size": 100
     },
     "fileB.txt": {
         "size": 200
     }
  }

My goal is to extract the names of the files, {"fileA.c","fileB.txt"}, using JsonPath. It's important to note that the number of files is unknown.

The issue I'm facing is not knowing whether the file name is a key or a value:

If it's a key...I have no way of knowing the key name since that's precisely the information I'm trying to extract.
If it's a value, then what exactly is its corresponding key?
Is it possible to use JsonPath to retrieve the file names? If yes, how can it be done?
In case JsonPath is unable to accomplish this task, is there another Java library for handling Json data that could help achieve the desired outcome?

java json jsonpath

Answer 1

Answer №1

When looking at the scenario you provided, fileA.c and fileB.txt serve as keys that can be accessed through iteration on the enclosing object's key "files".

In this particular situation, JSONPath may not be the most suitable (or applicable) method to use since it is intended for accessing elements when the document structure is known, meaning that the keys are already familiar. Utilizing a JSON parser would likely be a more straightforward approach.

Answer 2

When looking at the scenario you provided, fileA.c and fileB.txt serve as keys that can be accessed through iteration on the enclosing object's key "files".

In this particular situation, JSONPath may not be the most suitable (or applicable) method to use since it is intended for accessing elements when the document structure is known, meaning that the keys are already familiar. Utilizing a JSON parser would likely be a more straightforward approach.

Answer 3

Answer №2

If you're looking to improve your data structure, consider organizing it in the following way:

var filesData = {
   "files": [
      {
         "name": "fileA.c",
         "size": 100
      },
      {
         "name": "fileB.txt",
         "size": 200
      },
      {
         "name": "fileC.txt",
         "size": 50
      }
   ]
};

By structuring your data like this, you can take advantage of DefiantJS () to search for files with sizes larger than 100 as demonstrated below:

JSON.search(filesData, '//*[size >= 100]/name')

DefiantJS enhances JSON functionality by adding the "search" method, allowing you to query JSON structures using XPath expressions.

For a live demonstration using your specific data, feel free to check out this fiddle: http://jsfiddle.net/jRN22/

Answer 4

If you're looking to improve your data structure, consider organizing it in the following way:

var filesData = {
   "files": [
      {
         "name": "fileA.c",
         "size": 100
      },
      {
         "name": "fileB.txt",
         "size": 200
      },
      {
         "name": "fileC.txt",
         "size": 50
      }
   ]
};

By structuring your data like this, you can take advantage of DefiantJS () to search for files with sizes larger than 100 as demonstrated below:

JSON.search(filesData, '//*[size >= 100]/name')

DefiantJS enhances JSON functionality by adding the "search" method, allowing you to query JSON structures using XPath expressions.

For a live demonstration using your specific data, feel free to check out this fiddle: http://jsfiddle.net/jRN22/

Leveraging JsonPath to retrieve data without prior knowledge of the key

Answer №1

Answer №2

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