I need to retrieve generic JSON data from the backend, with a variable number of values and keys. How should I modify my get method to handle this? Currently, my code looks like this:
getArticoliByDesc = (descrizione : string) => {
return this.httpClient.get<{
this.nomeChiave:
}[]>(`http://${this.server}:${this.port}/api/articoli/cerca/descrizione/${descrizione}`) //ALT + 0096 | ALT GR + '
}
I'm unsure what type to specify within the <> brackets.
If you want to include the type as JSON, there is a typescript type for that purpose.
Here is a sample code snippet:
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-array-json-dates',
templateUrl: './array-json-dates.component.html',
styleUrls: ['./array-json-dates.component.scss']
})
export class ArrayJsonDatesComponent implements OnInit {
jsonObject: JSON;
arrayObj: any = [
{
id: 1,
name: "john",
lastModified: '2011-01-01 02:00:00'
},
// More data objects here...
]
constructor() {
this.jsonObject = <JSON>this.arrayObj;
}
ngOnInit(): void {
}
In your specific case, you can use the following code snippet:
getArticoliByDesc = (descrizione : string) => {
return this.httpClient.get<JSON>(`http://${this.server}:${this.port}/api/articoli/cerca/descrizione/${descrizione}`)
}
However, it is recommended to create a Model class that corresponds to your API response structure. This way, Angular HTTP will automatically convert the JSON response into an object that matches your model.
For example:
export class ApiModel{
property1: string;
property2: string;
property3: string;
}
getArticoliByDesc = (descrizione : string) => {
return this.httpClient.get<ApiModel>(`http://${this.server}:${this.port}/api/articoli/cerca/descrizione/${descrizione}`)
}
If you are unsure about the response type and don't mind about the typing, you can use:
const result = client.get<any>('URL');
If you know the response is an object but you are not familiar with its properties, you can do:
const result = client.get<{ [key: string]: unknown }>('URL');
// Alternatively, create an alias.
type Data = { [key: string]: unknown };
const result = client.get<Data>('URL');
// Or if you anticipate an array.
const result = client.get<Data[]>('URL');
If you require TypeScript to validate the type, you must ascertain the data type and define a corresponding typing. For instance:
type User = {
name: string;
email: string;
}
If you assume the response to be a User object => { name, email }
const result = client.get<User>('URL');
If you foresee the response to be an array of User objects => [ { name, email } ]
const result = client.get<User[]>('URL');
If you anticipate the response to be an array of specific string variables:
type KnownVariables = Array<'doctor' | 'programmer' | 'designer'>;
const result = client.get<KnownVariables>('URL');
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