How can I read an environment variable from a .NET appSettings.json file in an Angular service?










1















I'm new to Angular2 and have some questions.



I have a service which requests some JSON data from a Web API:



import Injectable from '@angular/core'; 
import Http from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ReviewService
private actionUrl: string;

constructor(private _http: Http)
this.actionUrl = 'http://api.dc-shop.com/review';


public GetAll = (): any =>
return this._http.get(this.actionUrl)
.map(x => x.json());




I would like to avoid hard coding the API address in the constructor and instead read a setting from appSettings.json which I can use for the action URL at startup for production and localhost servers.



What is the best way of doing this in ASP.NET MVC Core?










share|improve this question
























  • Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

    – loz
    Nov 13 '18 at 9:12











  • Why not to store this in some global service? and call every time from there

    – Pardeep Jain
    Nov 13 '18 at 9:13












  • Thanks for that link I can see having a separate Angular2 environment file would work.

    – loz
    Nov 13 '18 at 9:14











  • Thanks Dale that has answered my question.

    – loz
    Nov 13 '18 at 9:26















1















I'm new to Angular2 and have some questions.



I have a service which requests some JSON data from a Web API:



import Injectable from '@angular/core'; 
import Http from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ReviewService
private actionUrl: string;

constructor(private _http: Http)
this.actionUrl = 'http://api.dc-shop.com/review';


public GetAll = (): any =>
return this._http.get(this.actionUrl)
.map(x => x.json());




I would like to avoid hard coding the API address in the constructor and instead read a setting from appSettings.json which I can use for the action URL at startup for production and localhost servers.



What is the best way of doing this in ASP.NET MVC Core?










share|improve this question
























  • Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

    – loz
    Nov 13 '18 at 9:12











  • Why not to store this in some global service? and call every time from there

    – Pardeep Jain
    Nov 13 '18 at 9:13












  • Thanks for that link I can see having a separate Angular2 environment file would work.

    – loz
    Nov 13 '18 at 9:14











  • Thanks Dale that has answered my question.

    – loz
    Nov 13 '18 at 9:26













1












1








1








I'm new to Angular2 and have some questions.



I have a service which requests some JSON data from a Web API:



import Injectable from '@angular/core'; 
import Http from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ReviewService
private actionUrl: string;

constructor(private _http: Http)
this.actionUrl = 'http://api.dc-shop.com/review';


public GetAll = (): any =>
return this._http.get(this.actionUrl)
.map(x => x.json());




I would like to avoid hard coding the API address in the constructor and instead read a setting from appSettings.json which I can use for the action URL at startup for production and localhost servers.



What is the best way of doing this in ASP.NET MVC Core?










share|improve this question
















I'm new to Angular2 and have some questions.



I have a service which requests some JSON data from a Web API:



import Injectable from '@angular/core'; 
import Http from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ReviewService
private actionUrl: string;

constructor(private _http: Http)
this.actionUrl = 'http://api.dc-shop.com/review';


public GetAll = (): any =>
return this._http.get(this.actionUrl)
.map(x => x.json());




I would like to avoid hard coding the API address in the constructor and instead read a setting from appSettings.json which I can use for the action URL at startup for production and localhost servers.



What is the best way of doing this in ASP.NET MVC Core?







asp.net-mvc angular angular-services






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 13 '18 at 9:29







loz

















asked Nov 13 '18 at 9:07









lozloz

3817




3817












  • Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

    – loz
    Nov 13 '18 at 9:12











  • Why not to store this in some global service? and call every time from there

    – Pardeep Jain
    Nov 13 '18 at 9:13












  • Thanks for that link I can see having a separate Angular2 environment file would work.

    – loz
    Nov 13 '18 at 9:14











  • Thanks Dale that has answered my question.

    – loz
    Nov 13 '18 at 9:26

















  • Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

    – loz
    Nov 13 '18 at 9:12











  • Why not to store this in some global service? and call every time from there

    – Pardeep Jain
    Nov 13 '18 at 9:13












  • Thanks for that link I can see having a separate Angular2 environment file would work.

    – loz
    Nov 13 '18 at 9:14











  • Thanks Dale that has answered my question.

    – loz
    Nov 13 '18 at 9:26
















Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

– loz
Nov 13 '18 at 9:12





Yes, I have a appSettings.json file in my MVC project where I define the API address so that I can test it on localhost

– loz
Nov 13 '18 at 9:12













Why not to store this in some global service? and call every time from there

– Pardeep Jain
Nov 13 '18 at 9:13






Why not to store this in some global service? and call every time from there

– Pardeep Jain
Nov 13 '18 at 9:13














Thanks for that link I can see having a separate Angular2 environment file would work.

– loz
Nov 13 '18 at 9:14





Thanks for that link I can see having a separate Angular2 environment file would work.

– loz
Nov 13 '18 at 9:14













Thanks Dale that has answered my question.

– loz
Nov 13 '18 at 9:26





Thanks Dale that has answered my question.

– loz
Nov 13 '18 at 9:26












2 Answers
2






active

oldest

votes


















1














Two options I can think of:



1) Put the configuration in environment.ts as well as appSettings.json - access to this is built into angular.



2) Step 1 of your service loads appSettings.json using a straight-forward http.get and then uses the config from it load the required data.



Example of environment.ts



export const environment = 
apiUrl: 'http://api.dc-shop.com',
mode: 'prod'
;


Example usage:



import environment from './environment'; 
constructor(private _http: Http)
this.actionUrl = environment.apiUrl + '/review';






share|improve this answer




















  • 1





    I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

    – loz
    Nov 13 '18 at 12:11


















1














You can implement this by using Angular Http Intercepter



Add the http://api.dc-shop.com prefix in each request.



Example Code:



Write an Request Intercepter in Your Angular App:



@Injectable()
export class RequestInterceptor implements HttpInterceptor

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
let req_url = req.url
req.clone(url:`http://api.dc-shop.com/$req_url`)
return next.handle(req);






And in your Main Module:



 export const httpInterceptorProviders = [
provide: HTTP_INTERCEPTORS, useClass: RequestInterceptor, multi: true,
}

@NgModule(
providers: [...,httpInterceptorProviders]
)


If you want to config your prefix url in different environment:



Your can define it in your environment.xx.ts under /src/environments



And Define the build config in angular.json



 ....
"configurations":
"api":
....
"fileReplacements": [

"replace": "src/environments/environment.ts",
"with": "src/environments/environment.api.ts"

]

....

...


And when your build your app ,



just add configuration



 ng build --configuration=api


Good Luck!






share|improve this answer

























  • Better would be If you provide example too.

    – Pardeep Jain
    Nov 13 '18 at 9:14











  • I think api doc's examples are very clear now

    – junk
    Nov 13 '18 at 9:17











  • meta.stackexchange.com/questions/8231/…

    – Dale Burrell
    Nov 13 '18 at 9:18











  • I have updated my answer now

    – junk
    Nov 13 '18 at 9:38










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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














Two options I can think of:



1) Put the configuration in environment.ts as well as appSettings.json - access to this is built into angular.



2) Step 1 of your service loads appSettings.json using a straight-forward http.get and then uses the config from it load the required data.



Example of environment.ts



export const environment = 
apiUrl: 'http://api.dc-shop.com',
mode: 'prod'
;


Example usage:



import environment from './environment'; 
constructor(private _http: Http)
this.actionUrl = environment.apiUrl + '/review';






share|improve this answer




















  • 1





    I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

    – loz
    Nov 13 '18 at 12:11















1














Two options I can think of:



1) Put the configuration in environment.ts as well as appSettings.json - access to this is built into angular.



2) Step 1 of your service loads appSettings.json using a straight-forward http.get and then uses the config from it load the required data.



Example of environment.ts



export const environment = 
apiUrl: 'http://api.dc-shop.com',
mode: 'prod'
;


Example usage:



import environment from './environment'; 
constructor(private _http: Http)
this.actionUrl = environment.apiUrl + '/review';






share|improve this answer




















  • 1





    I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

    – loz
    Nov 13 '18 at 12:11













1












1








1







Two options I can think of:



1) Put the configuration in environment.ts as well as appSettings.json - access to this is built into angular.



2) Step 1 of your service loads appSettings.json using a straight-forward http.get and then uses the config from it load the required data.



Example of environment.ts



export const environment = 
apiUrl: 'http://api.dc-shop.com',
mode: 'prod'
;


Example usage:



import environment from './environment'; 
constructor(private _http: Http)
this.actionUrl = environment.apiUrl + '/review';






share|improve this answer















Two options I can think of:



1) Put the configuration in environment.ts as well as appSettings.json - access to this is built into angular.



2) Step 1 of your service loads appSettings.json using a straight-forward http.get and then uses the config from it load the required data.



Example of environment.ts



export const environment = 
apiUrl: 'http://api.dc-shop.com',
mode: 'prod'
;


Example usage:



import environment from './environment'; 
constructor(private _http: Http)
this.actionUrl = environment.apiUrl + '/review';







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 13 '18 at 14:11









loz

3817




3817










answered Nov 13 '18 at 9:29









Dale BurrellDale Burrell

3,17132451




3,17132451







  • 1





    I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

    – loz
    Nov 13 '18 at 12:11












  • 1





    I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

    – loz
    Nov 13 '18 at 12:11







1




1





I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

– loz
Nov 13 '18 at 12:11





I ended up going for option 1 and having a separate environment.ts. The appsettings.json file is not copied to wwwroot and could contain connection strings so it was not the best solution for me.

– loz
Nov 13 '18 at 12:11













1














You can implement this by using Angular Http Intercepter



Add the http://api.dc-shop.com prefix in each request.



Example Code:



Write an Request Intercepter in Your Angular App:



@Injectable()
export class RequestInterceptor implements HttpInterceptor

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
let req_url = req.url
req.clone(url:`http://api.dc-shop.com/$req_url`)
return next.handle(req);






And in your Main Module:



 export const httpInterceptorProviders = [
provide: HTTP_INTERCEPTORS, useClass: RequestInterceptor, multi: true,
}

@NgModule(
providers: [...,httpInterceptorProviders]
)


If you want to config your prefix url in different environment:



Your can define it in your environment.xx.ts under /src/environments



And Define the build config in angular.json



 ....
"configurations":
"api":
....
"fileReplacements": [

"replace": "src/environments/environment.ts",
"with": "src/environments/environment.api.ts"

]

....

...


And when your build your app ,



just add configuration



 ng build --configuration=api


Good Luck!






share|improve this answer

























  • Better would be If you provide example too.

    – Pardeep Jain
    Nov 13 '18 at 9:14











  • I think api doc's examples are very clear now

    – junk
    Nov 13 '18 at 9:17











  • meta.stackexchange.com/questions/8231/…

    – Dale Burrell
    Nov 13 '18 at 9:18











  • I have updated my answer now

    – junk
    Nov 13 '18 at 9:38















1














You can implement this by using Angular Http Intercepter



Add the http://api.dc-shop.com prefix in each request.



Example Code:



Write an Request Intercepter in Your Angular App:



@Injectable()
export class RequestInterceptor implements HttpInterceptor

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
let req_url = req.url
req.clone(url:`http://api.dc-shop.com/$req_url`)
return next.handle(req);






And in your Main Module:



 export const httpInterceptorProviders = [
provide: HTTP_INTERCEPTORS, useClass: RequestInterceptor, multi: true,
}

@NgModule(
providers: [...,httpInterceptorProviders]
)


If you want to config your prefix url in different environment:



Your can define it in your environment.xx.ts under /src/environments



And Define the build config in angular.json



 ....
"configurations":
"api":
....
"fileReplacements": [

"replace": "src/environments/environment.ts",
"with": "src/environments/environment.api.ts"

]

....

...


And when your build your app ,



just add configuration



 ng build --configuration=api


Good Luck!






share|improve this answer

























  • Better would be If you provide example too.

    – Pardeep Jain
    Nov 13 '18 at 9:14











  • I think api doc's examples are very clear now

    – junk
    Nov 13 '18 at 9:17











  • meta.stackexchange.com/questions/8231/…

    – Dale Burrell
    Nov 13 '18 at 9:18











  • I have updated my answer now

    – junk
    Nov 13 '18 at 9:38













1












1








1







You can implement this by using Angular Http Intercepter



Add the http://api.dc-shop.com prefix in each request.



Example Code:



Write an Request Intercepter in Your Angular App:



@Injectable()
export class RequestInterceptor implements HttpInterceptor

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
let req_url = req.url
req.clone(url:`http://api.dc-shop.com/$req_url`)
return next.handle(req);






And in your Main Module:



 export const httpInterceptorProviders = [
provide: HTTP_INTERCEPTORS, useClass: RequestInterceptor, multi: true,
}

@NgModule(
providers: [...,httpInterceptorProviders]
)


If you want to config your prefix url in different environment:



Your can define it in your environment.xx.ts under /src/environments



And Define the build config in angular.json



 ....
"configurations":
"api":
....
"fileReplacements": [

"replace": "src/environments/environment.ts",
"with": "src/environments/environment.api.ts"

]

....

...


And when your build your app ,



just add configuration



 ng build --configuration=api


Good Luck!






share|improve this answer















You can implement this by using Angular Http Intercepter



Add the http://api.dc-shop.com prefix in each request.



Example Code:



Write an Request Intercepter in Your Angular App:



@Injectable()
export class RequestInterceptor implements HttpInterceptor

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
let req_url = req.url
req.clone(url:`http://api.dc-shop.com/$req_url`)
return next.handle(req);






And in your Main Module:



 export const httpInterceptorProviders = [
provide: HTTP_INTERCEPTORS, useClass: RequestInterceptor, multi: true,
}

@NgModule(
providers: [...,httpInterceptorProviders]
)


If you want to config your prefix url in different environment:



Your can define it in your environment.xx.ts under /src/environments



And Define the build config in angular.json



 ....
"configurations":
"api":
....
"fileReplacements": [

"replace": "src/environments/environment.ts",
"with": "src/environments/environment.api.ts"

]

....

...


And when your build your app ,



just add configuration



 ng build --configuration=api


Good Luck!







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 13 '18 at 9:37

























answered Nov 13 '18 at 9:11









junkjunk

258418




258418












  • Better would be If you provide example too.

    – Pardeep Jain
    Nov 13 '18 at 9:14











  • I think api doc's examples are very clear now

    – junk
    Nov 13 '18 at 9:17











  • meta.stackexchange.com/questions/8231/…

    – Dale Burrell
    Nov 13 '18 at 9:18











  • I have updated my answer now

    – junk
    Nov 13 '18 at 9:38

















  • Better would be If you provide example too.

    – Pardeep Jain
    Nov 13 '18 at 9:14











  • I think api doc's examples are very clear now

    – junk
    Nov 13 '18 at 9:17











  • meta.stackexchange.com/questions/8231/…

    – Dale Burrell
    Nov 13 '18 at 9:18











  • I have updated my answer now

    – junk
    Nov 13 '18 at 9:38
















Better would be If you provide example too.

– Pardeep Jain
Nov 13 '18 at 9:14





Better would be If you provide example too.

– Pardeep Jain
Nov 13 '18 at 9:14













I think api doc's examples are very clear now

– junk
Nov 13 '18 at 9:17





I think api doc's examples are very clear now

– junk
Nov 13 '18 at 9:17













meta.stackexchange.com/questions/8231/…

– Dale Burrell
Nov 13 '18 at 9:18





meta.stackexchange.com/questions/8231/…

– Dale Burrell
Nov 13 '18 at 9:18













I have updated my answer now

– junk
Nov 13 '18 at 9:38





I have updated my answer now

– junk
Nov 13 '18 at 9:38

















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