The method JSON.stringify is not properly converting the entire object to a string

Question

The method JSON.stringify is not properly converting the entire object to a string

JSON.stringify(this.workout) is not properly stringifying the entire object. The workout variable is an instance of the Workout class, defined as follows:


export class Workout {
    id: string;
    name: string;
    exercises: Exercise[];
    routine: Routine;
}

The Exercise and Routine classes also contain nested arrays.

The issue lies in the fact that JSON.stringify(this.workout) only returns {"name":"Day 1"}. Can anyone suggest where the problem might be?

javascript json typescript stringify

Answer 1

Answer №1

To ensure proper serialization of any classes, it may be necessary to define a toJSON() method. Failure to do so will result in only the regular enumerable properties being included in the output.

This method is likely required for classes such as Exercise, Routine, and Workout.

Additional resource: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Answer 2

To ensure proper serialization of any classes, it may be necessary to define a toJSON() method. Failure to do so will result in only the regular enumerable properties being included in the output.

This method is likely required for classes such as Exercise, Routine, and Workout.

Additional resource: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Answer 3

Answer №2

After examining the example using plain JS, it is evident that the code functions as intended. It is advisable to carefully review your code and ensure that all objects are properly initialized.

Another approach would be to create a custom toJSON method for any of those classes in order to specify how you want them to be serialized (refer to the example in the class Routine):

class Exercises {
  constructor() {
    this.items = [1, 2, 3];
  }
}

class Routine {
  constructor() {
    this.property = 'DATA';
  }
  
  toJSON() {
    return `ROUTINE = ${ this.property }`;
  }
}

class Workout {
  constructor() {
    this.id = 1;
    this.name = 'Foo';
    this.exercises = new Exercises();
    this.routine = new Routine();
  }
}

const workout = new Workout();

console.log(JSON.stringify(workout, null, 4));

.as-console-wrapper {
  max-height: none !important;
}

Answer 4

After examining the example using plain JS, it is evident that the code functions as intended. It is advisable to carefully review your code and ensure that all objects are properly initialized.

Another approach would be to create a custom toJSON method for any of those classes in order to specify how you want them to be serialized (refer to the example in the class Routine):

class Exercises {
  constructor() {
    this.items = [1, 2, 3];
  }
}

class Routine {
  constructor() {
    this.property = 'DATA';
  }
  
  toJSON() {
    return `ROUTINE = ${ this.property }`;
  }
}

class Workout {
  constructor() {
    this.id = 1;
    this.name = 'Foo';
    this.exercises = new Exercises();
    this.routine = new Routine();
  }
}

const workout = new Workout();

console.log(JSON.stringify(workout, null, 4));

.as-console-wrapper {
  max-height: none !important;
}

The method JSON.stringify is not properly converting the entire object to a string

Answer №1

Answer №2

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