objectypes
v1.3.1
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A type-safe library to transform and validate objects
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objectypes
A type-safe library to transform and validate objects.
Find more details about objectypes usage in the API Reference.
Installation
Make sure these compilerOptions
flags are in the tsconfig.json
file.
"emitDecoratorMetadata": true,
"experimentalDecorators": true
Run npm i --save objectypes
to add it to your project.
Quick Start
Suppose you are requesting data from an API and you want to validate and have a type safe object from the JSON the API returns.
A JSON example:
{
"userData": [
{
"name": "John ",
"age": 19,
"likes": 2
},
{
"name": "Maria",
"age": 30,
"likes": 0
},
{
"name": "Peter",
"age": 28,
"posts": [
{
"title": "Comment here some lines from musics you like",
"createdAt": "2021-10-14T20: 40: 07.609Z",
"comments": ["Such a lonely day and it's mine"]
}
],
"likes": 100
}
]
}
The target Typescript type:
import { BuildTransformation, Property } from 'objectypes'
class Post {
@Property()
title: string
@Property()
createdAt: Date
@Property({ nullable: true })
comments?: string[]
}
class PostPublisher {
@Property({ nullable: true, type: Post })
posts?: Post[]
}
class User extends PostPublisher {
@BuildTransformation({ transform: (name: string) => name.trim() })
@Property()
name: string
@Property()
age: number
@Property()
likes: number
}
export class APIResponse {
@Property({ name: 'userData', type: User })
users: User[]
}