Can a function be saved as a key-value pair in a .json file in Angular 5?

Question

Can a function be saved as a key-value pair in a .json file in Angular 5?

In our Angular 5 project, we are facing an issue with loading a .json file in a .ts file using XMLHttpRequest.

The content of the .json file is as follows:

{
    stringKey: "stringValue",
    functionKey: function() {
        console.log('function called!')
    }
}

An error is being thrown: [json] value expected.

When setting the object in Chrome Devtool, it works fine, but not within the project itself.

If I open Chrome Devtool and set the above object as value - it works fine but not in the project

var obj = {
  stringKey: "stringValue",
  functionKey: function() {
    console.log('function called!')
  }
}

obj.functionKey();

Edit:

Is there a workaround for storing functions in pure JSON?

javascript json angular typescript visual-studio-code

Answer 1

Answer №1

Embedding a function directly into a JSON file is not possible due to its structured data format nature. However, you can achieve the same effect by utilizing a JavaScript file and creating a JS Object containing the function code:

const obj = {
  customFunction: function() {
    console.log('The function has been executed!');
  }
}
obj.customFunction();

Answer 2

Embedding a function directly into a JSON file is not possible due to its structured data format nature. However, you can achieve the same effect by utilizing a JavaScript file and creating a JS Object containing the function code:

const obj = {
  customFunction: function() {
    console.log('The function has been executed!');
  }
}
obj.customFunction();

Answer 3

Answer №2

JSON does not include a function data type.

To learn more, check out the official documentation. JSON primarily supports objects, arrays, strings, numbers, booleans, and null values.

Keep in mind that JSON is a data format and not a programming language, hence the absence of support for functions within its structure.

Answer 4

JSON does not include a function data type.

To learn more, check out the official documentation. JSON primarily supports objects, arrays, strings, numbers, booleans, and null values.

Keep in mind that JSON is a data format and not a programming language, hence the absence of support for functions within its structure.

Answer 5

Answer №3

Try this solution: ensure that functionKey is a string. Then, you can use eval to retrieve the result.

var obj =  {
stringKey : "stringValue",
functionKey: "(function() { console.log('function called')})()"
}

var result = eval(obj.functionKey);

Visit this link for more information.

Answer 6

Try this solution: ensure that functionKey is a string. Then, you can use eval to retrieve the result.

var obj =  {
stringKey : "stringValue",
functionKey: "(function() { console.log('function called')})()"
}

var result = eval(obj.functionKey);

Visit this link for more information.

Answer 7

Answer №4

let data = {
  key: "value",
  method: function() {
    console.log('method executed!')
  }
}

data.method();

By defining an Object data, we are not working with JSON.

When attempting to convert this Object into JSON using JSON.stringify(data), the method portion will be omitted since it is not a string.

Answer 8

let data = {
  key: "value",
  method: function() {
    console.log('method executed!')
  }
}

data.method();

By defining an Object data, we are not working with JSON.

When attempting to convert this Object into JSON using JSON.stringify(data), the method portion will be omitted since it is not a string.

Can a function be saved as a key-value pair in a .json file in Angular 5?

Answer №1

Answer №2

Answer №3

Answer №4

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