Description

Is simple util who can change object key names by case strategy. For example, your yml config uses snake case but you need a javascript object with keys in the lower camel case. It is this simple functionality give this package!

Installation

$ npm i --save object-case-builder

Examples

snake-case to lower camel case

import {
  ObjectCaseBuilder,
  PropertyNamingStrategyEnum,
} from 'object-case-builder';

const input: object = {
  'max_users_count': 1,
  'auth_secret_token': 'SECRET TOKEN',
  'credit_card_number': 00000000000000,
}

const output: object = new ObjectCaseBuilder()
  .setPropertyNamingStrategy(PropertyNamingStrategyEnum.LOWER_CAMEL_CASE)
  .formatObject(
    input,
    PropertyNamingStrategyEnum.SNAKE_CASE
  );

console.log(output);

/* console output
{
  maxUsersCount: 1,
  authSecretToken: 'SECRET TOKEN',
  creditCardNumber: 00000000000000
}
*/

kebab-case to screaming-snake-case

import {
  ObjectCaseBuilder,
  PropertyNamingStrategyEnum,
} from 'object-case-builder';

const input: object = {
  'message-content': 'test',
  'timestamp': 1673698827991,
  'author-name': 'nikyoff',
}

const output: object = new ObjectCaseBuilder()
  .setPropertyNamingStrategy(PropertyNamingStrategyEnum.SCREAMING_SNAKE_CASE)
  .formatObject(
    input,
    PropertyNamingStrategyEnum.KEBAB_CASE
  );

console.log(output);

/* console output
{
  'MESSAGE_CONTENT': 'test',
  'TIMESTAMP': 1673698827991,
  'AUTHOR_NAME': 'nikyoff',
}
*/

Build class output

Sometime you need transform your output to class and thats possible!

//message-data.ts
import { Expose, Transform } from "class-transformer";

export class MessageData {
  @Expose()
  @Transform(params => params.value instanceof Date ? params.value : new Date(params.value))
  public createTimestamp: Date;

  @Expose()
  public messageContent: string;
}

import {
  ObjectCaseBuilder,
  PropertyNamingStrategyEnum,
} from 'object-case-builder';
import { MessageData } from './message-data'


const input: object = {
  'create_timestamp': 1673698827991,
  'message-content': 'test',
}

const output: MessageData = new ObjectCaseBuilder<MessageData>()
  .setPropertyNamingStrategy(PropertyNamingStrategyEnum.LOWER_CAMEL_CASE)
  .formatObject(
    input,
    PropertyNamingStrategyEnum.SNAKE_CASE,
    MessageData
  );

Register custom case

Implement class for your case

//screaming-snake.property-naming-strategy.ts
export class ScreamingSnakePropertyNamingStrategy extends PropertyNamingStrategy {
  public propertyNameToWords(property: string): string[] {
    return property.split('_');
  }

  public wordsToPropertyName(words: string[]): string {
    return words.join('_').toUpperCase();
  }
}

Register strategy

import { PropertyNamingRegister } from 'object-case-builder';
import { ScreamingSnakePropertyNamingStrategy } from './screaming-snake.property-naming-strategy';

PropertyNamingRegister.registerStrategy(
  'SCREAMING_SNAKE_CASE',
  ScreamingSnakePropertyNamingStrategy,
);