Leveraging JSON.stringify alongside getter/setter in TypeScript

Question

Leveraging JSON.stringify alongside getter/setter in TypeScript

In my TypeScript code, I am utilizing getter/setter accessors. To differentiate between variables and methods with the same name, I have adopted the convention of prefixing the variable with a lower dash, as shown in many examples:

private _major: number;

get major(): number {
  return this._major;
}
set major(major: number) {
  this._major = major;
}

When I use JSON.stringify() to convert the object into a JSON string, it uses the variable name (_major) as the key.

I prefer not to have all keys prefixed with a lower dash in the JSON output file. Is there a way for TypeScript to utilize the name of the getter method as the key instead? Or are there other techniques to maintain clean JSON output while still using getter/setter methods?

Although I am aware of manual approaches to modify JSON keys before generating the output string, I am interested in finding a simpler solution.

Here is a JSFiddle that showcases the current behavior.

json typescript getter-setter

Answer 1

Answer №1

Unfortunately, using the getter/setter name instead of the property name with JSON.stringify is not possible.

One workaround is to create a method like this:

class AppInfo {
    private _appId: number;

    get appId(): number {
        return this._appId;
    }

    set appId(appId: number) {
        this._appId = appId;
    }

    toJsonString(): string {
        let jsonString = JSON.stringify(this);
        Object.keys(this).filter(key => key[0] === "_").forEach(key => {
            jsonString = jsonString.replace(key, key.substring(1));
        });

        return jsonString;
    }
}

let app = new AppInfo();
app.appId = 12345;
console.log(app.toJsonString()); // {"appId":12345}

Answer 2

Unfortunately, using the getter/setter name instead of the property name with JSON.stringify is not possible.

One workaround is to create a method like this:

class AppInfo {
    private _appId: number;

    get appId(): number {
        return this._appId;
    }

    set appId(appId: number) {
        this._appId = appId;
    }

    toJsonString(): string {
        let jsonString = JSON.stringify(this);
        Object.keys(this).filter(key => key[0] === "_").forEach(key => {
            jsonString = jsonString.replace(key, key.substring(1));
        });

        return jsonString;
    }
}

let app = new AppInfo();
app.appId = 12345;
console.log(app.toJsonString()); // {"appId":12345}

Answer 3

Answer №2

After trying out @Jan-Aagaard's method, I decided to test this implementation:

public convertToJSON(): string {
    let obj = Object.assign(this);
    let keys = Object.keys(this.constructor.prototype);
    obj.convertToJSON = undefined;
    return JSON.stringify(obj, keys);
}

This code snippet is designed for utilizing the convertToJSON function.

Answer 4

After trying out @Jan-Aagaard's method, I decided to test this implementation:

public convertToJSON(): string {
    let obj = Object.assign(this);
    let keys = Object.keys(this.constructor.prototype);
    obj.convertToJSON = undefined;
    return JSON.stringify(obj, keys);
}

This code snippet is designed for utilizing the convertToJSON function.

Answer 5

Answer №3

In my opinion, directly iterating through the properties and manipulating strings can be risky. Instead, I prefer utilizing the prototype of the object itself. Here's an example of how you can achieve this:

public static convertToStringJSON() : string {
    return JSON.stringify(this, Object.keys(this.constructor.prototype)); // assuming 'this' refers to the version class
}

Answer 6

In my opinion, directly iterating through the properties and manipulating strings can be risky. Instead, I prefer utilizing the prototype of the object itself. Here's an example of how you can achieve this:

public static convertToStringJSON() : string {
    return JSON.stringify(this, Object.keys(this.constructor.prototype)); // assuming 'this' refers to the version class
}

Answer 7

Answer №4

A recent project of mine led me to develop a compact library called ts-typed, aimed at generating getter and setter functions for runtime type checking. During this process, I encountered an issue with JSON.stringify() and resolved it by introducing a custom serializer. To streamline the serialization process, I also proposed incorporating a toString method (similar to Java's) under the name toJSON.

For instance:

import { TypedSerializer } from 'ts-typed';

export class RuntimeTypedClass {
    private _major: number;

    get major(): number {
       return this._major;
    }

    set major(major: number) {
       this._major = major;
    }
    /**
    * The toJSON method acts as a toString equivalent, simplifying property access.
    *
    */
    toJSON(): RuntimeTypedClass {
        return TypedSerializer.serialize(this);
    }
}

Answer 8

A recent project of mine led me to develop a compact library called ts-typed, aimed at generating getter and setter functions for runtime type checking. During this process, I encountered an issue with JSON.stringify() and resolved it by introducing a custom serializer. To streamline the serialization process, I also proposed incorporating a toString method (similar to Java's) under the name toJSON.

For instance:

import { TypedSerializer } from 'ts-typed';

export class RuntimeTypedClass {
    private _major: number;

    get major(): number {
       return this._major;
    }

    set major(major: number) {
       this._major = major;
    }
    /**
    * The toJSON method acts as a toString equivalent, simplifying property access.
    *
    */
    toJSON(): RuntimeTypedClass {
        return TypedSerializer.serialize(this);
    }
}

Answer 9

Answer №5

An innovative solution for handling getter/setter methods in situations where private fields are not explicitly defined or named differently. By utilizing Object.getOwnPropertyDescriptors, we can extract the get methods from the prototype.

In order to make the object compatible with JSON.stringify, a custom toJSON function is added to perform a shallow clone using Object.assign(...). Care is taken to avoid an infinite loop by excluding JSON.stringify() calls within the toJSON method and removing any _private fields for cleanliness.

public toJSON(): any {

    let clone: any = Object.assign({}, this); 

    const descriptors = Object.getOwnPropertyDescriptors(Object.getPrototypeOf(this))

    Object.keys(descriptors).forEach(key => {
        if (descriptors[key] && descriptors[key].get) {

            delete clone[key];
            clone[key] = this[key]; 
        }
    });

    Object.keys(clone).forEach(key => {
        if (key.indexOf('_') == 0) {
            delete clone[key];
        }
    });

    return clone;
}

Answer 10

An innovative solution for handling getter/setter methods in situations where private fields are not explicitly defined or named differently. By utilizing Object.getOwnPropertyDescriptors, we can extract the get methods from the prototype.

In order to make the object compatible with JSON.stringify, a custom toJSON function is added to perform a shallow clone using Object.assign(...). Care is taken to avoid an infinite loop by excluding JSON.stringify() calls within the toJSON method and removing any _private fields for cleanliness.

public toJSON(): any {

    let clone: any = Object.assign({}, this); 

    const descriptors = Object.getOwnPropertyDescriptors(Object.getPrototypeOf(this))

    Object.keys(descriptors).forEach(key => {
        if (descriptors[key] && descriptors[key].get) {

            delete clone[key];
            clone[key] = this[key]; 
        }
    });

    Object.keys(clone).forEach(key => {
        if (key.indexOf('_') == 0) {
            delete clone[key];
        }
    });

    return clone;
}

Answer 11

Answer №6

This solution may not be dynamic, but it gets the job done

export class MyClass{
     text: string

     get html() {
         return this.text.toString().split("\n").map(e => `<p>${e}</p>`).join('');
     }

     toJson(): string {
         return JSON.stringify({ ...this, html: this.html })
     }
}

When using this code snippet

console.log(myClassObject.toJson())

Answer 12

This solution may not be dynamic, but it gets the job done

export class MyClass{
     text: string

     get html() {
         return this.text.toString().split("\n").map(e => `<p>${e}</p>`).join('');
     }

     toJson(): string {
         return JSON.stringify({ ...this, html: this.html })
     }
}

When using this code snippet

console.log(myClassObject.toJson())

Leveraging JSON.stringify alongside getter/setter in TypeScript

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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