CODEWITHSUNDEEP
jsonswiftstringreplaceescaping
user2363025
user2363025

Reputation: 6505

Replace instances of \" with "

I am trying to strip out unwanted slashes from a json file. I can't simply replace all instances of \ but rather, i need to escape instances of \" with just "

e.g. my json string looks like so:

[{
    "type": "test",
    "action": "test",
    "filename": 1,
    "data": "{\"a\":1,\"b\":10000,\"c\":0,\"d\":\"\"}"
}, {
    "type": "test2",
    "action": "test2",
    "filename": 2,
    "data": "{\"a\":2,\"b\":10000,\"c\":15,\"d\":\"\"}"
}]

I can't figure out the syntax of a find and replace for this:

let jsonStringTrimmed = jsonString.replacingOccurrences(of: "\"", with: """)

Another possible pitfall is that the param d is a base64 encoded string so I need to be able to avoid replacing \" within the value for that key

The goal is to be able to use jsonStringTrimmed as below:

let jsonStr = try String(contentsOf: path, encoding: String.Encoding.utf8)
let jsonStringTrimmed = jsonStr.replacingOccurrences(of: "\", with: """)
let json = try JSONSerializer.toDictionary(jsonStringTrimmed)

UPDATE:

I initially had tried:

 do {
     let jsonStr = try String(contentsOf: path, encoding: String.Encoding.utf8)

     let json = try JSONSerializer.toDictionary(jsonStr)
 }
 catch {
     print("Error reading file : \(error)")
 }

And I was getting into the catch and receiving the error jsonIsNotDictinary

UPDATE 2 : Trying to loop through array after employing NivraD's approach:

 if let jsonData = try? Data(contentsOf: path){
        if let array = (try? JSONSerialization.jsonObject(with: jsonData, options: [])) as? [[String: Any]] {
            for i in array{
                print(array[i]?["data"] as! String)
                let dataJsonStr = array[i]?["data"] as! String
                if let dataDict = try? JSONSerializer.toDictionary(dataJsonStr){
                    print("a : \(dataDict["a"] as! String)")
                }
            }
        }
        else{
                print("in the else of if let array")
        }
    }
    else{
        print("in the else of if let jsonData")
    }

but this gives me the error: Cannot subscript value of type [[String : Any]] with an index of type Dictionary pointing to: print(employeeArray[i]?["data"] as! String)

Upvotes: 0

Views: 1177

Answers (1)

Nirav D
Nirav D

Reputation: 72410

Your String is JSON Array, so simply convert it to Array no need to replacing anything with it. So first get Data from jsonString and then use this data with JSONSerialization to get Array from it.

if let jsonData = try? Data(contentsOf: URL(fileURLWithPath: path))
    if let array = (try? JSONSerialization.jsonObject(with: jsonData, options: [])) as? [[String: Any]] {
        print(array.first?["a"])
    }
}

Upvotes: 2

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