How to pass url arguments (query string) to a HTTP request on Angular?

The HttpClient methods allow you to set the params in it's options.

You can configure it by importing the HttpClientModule from the @angular/common/http package.

import {HttpClientModule} from '@angular/common/http';@NgModule({  imports: [ BrowserModule, HttpClientModule ],  declarations: [ App ],  bootstrap: [ App ]})export class AppModule {}

After that you can inject the HttpClient and use it to do the request.

import {HttpClient} from '@angular/common/http'@Component({  selector: 'my-app',  template: `    <div>      <h2>Hello {{name}}</h2>    </div>  `,})export class App {  name:string;  constructor(private httpClient: HttpClient) {    this.httpClient.get('/url', {      params: {        appid: 'id1234',        cnt: '5'      },      observe: 'response'    })    .toPromise()    .then(response => {      console.log(response);    })    .catch(console.log);  }}

For angular versions prior to version 4 you can do the same using the Http service.

The Http.get method takes an object that implements RequestOptionsArgs as a second parameter.

The search field of that object can be used to set a string or a URLSearchParams object.

An example:

 // Parameters obj- let params: URLSearchParams = new URLSearchParams(); params.set('appid', StaticSettings.API_KEY); params.set('cnt', days.toString()); //Http request- return this.http.get(StaticSettings.BASE_URL, {   search: params }).subscribe(   (response) => this.onGetForecastResult(response.json()),    (error) => this.onGetForecastError(error.json()),    () => this.onGetForecastComplete() );

The documentation for the Http class has more details. It can be found here and an working example here.

Edit Angular >= 4.3.x

HttpClient has been introduced along with HttpParams. Below an example of use :

import { HttpParams, HttpClient } from '@angular/common/http';constructor(private http: HttpClient) { }let params = new HttpParams();params = params.append('var1', val1);params = params.append('var2', val2);this.http.get(StaticSettings.BASE_URL, {params: params}).subscribe(...);

(Old answers)

Edit Angular >= 4.x

requestOptions.search has been deprecated. Use requestOptions.params instead :

let requestOptions = new RequestOptions();requestOptions.params = params;

Original answer (Angular 2)

You need to import URLSearchParams as below

import { Http, RequestOptions, URLSearchParams } from '@angular/http';

And then build your parameters and make the http request as the following :

let params: URLSearchParams = new URLSearchParams();params.set('var1', val1);params.set('var2', val2);let requestOptions = new RequestOptions();requestOptions.search = params;this.http.get(StaticSettings.BASE_URL, requestOptions)    .toPromise()    .then(response => response.json())...

Version 5+

With Angular 5 and up, you DON'T have to use HttpParams. You can directly send your json object as shown below.

let data = {limit: "2"};this.httpClient.get<any>(apiUrl, {params: data});

Please note that data values should be string, ie; { params: {limit: "2"}}

Version 4.3.x+

Use HttpParams, HttpClient from @angular/common/http

import { HttpParams, HttpClient } from '@angular/common/http';...constructor(private httpClient: HttpClient) { ... }...let params = new HttpParams();params = params.append("page", 1);....this.httpClient.get<any>(apiUrl, {params: params});

Also, try stringifying your nested object using JSON.stringify().