Angular 5 Service to read local json file

Question

I am using Angular 5 and I ve created a service using the angular-cli  What I want to do is to create a service that reads a local json file for Angular 5   This is what I have     I m a bit stuck     import   Injectable   from   angular core   import   HttpClientModule   from   angular common http     Injectable   export class AppSettingsService      constructor private http  HttpClientModule        var obj      this getJSON   subscribe data   gt  obj data  error   gt  console log error           public getJSON    Observable lt any gt        return this http get    assets mydata json          map  res any    gt  res json           catch  error any    gt  console log error              How can I get this finished

User · Answer

import data  from    data json   export class AppComponent        json any   data      See this article for more details

User · Answer

Let   s create a JSON file  we name it navbar json you can name it whatever you want   navbar json             href             text    Home        icon                    href             text    Bundles        icon            children                      href     national            text    National            icon    assets images national svg                        Now we   ve created a JSON file with some menu data  We   ll go to app component file and paste the below code   app component ts  import   Component   from   angular core   import menudata from    navbar json     Component     selector   lm-navbar     templateUrl     navbar component html     export class NavbarComponent       mainmenu any   menudata       Now your Angular 7 app is ready to serve the data from the local JSON file   Go to app component html and paste the following code in it   app component html   lt ul class  navbar-nav ml-auto  gt                     lt li class  nav-item   ngFor  let menu of mainmenu  gt                     lt a class  nav-link  href    menu href    gt   menu icon     menu text   lt  a gt                     lt ul class  sub menu   ngIf  menu children  amp  amp  menu children length  gt  0  gt                                lt li  ngFor  let sub menu of menu children  gt  lt a class  nav-link  href    sub menu href    gt  lt img src    sub menu icon    class  nav-img    gt    sub menu text   lt  a gt  lt  li gt                            lt  ul gt                     lt  li gt                     lt  ul gt

User · Answer

For Angular 7  I followed these steps to directly import json data   In tsconfig app json   add  resolveJsonModule   true in  compilerOptions   In a service or component   import   as exampleData from     example json     And then  private example   exampleData

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Try This   Write code in your service    import  Observable  of  from  rxjs     import json file  import Product  from    database product json    getProduct    Observable lt any gt       return of Product  pipe delay 1000        In component  get products        this sharedService getProduct   subscribe res  gt           console log res

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Assumes  you have a data json file in the src app folder of your project with the following values                   quot id quot   1           quot name quot    quot Licensed Frozen Hat quot            quot description quot    quot Incidunt et magni est ut  quot            quot price quot    quot 170 00 quot            quot imageUrl quot    quot https   source unsplash com 1600x900  product quot            quot quantity quot   56840                   3 Methods for Reading Local JSON Files Method 1  Reading Local JSON Files Using TypeScript 2 9  import Statement import   Component  OnInit   from   angular core   import   as data from    data json     Component     selector   app-root     template    lt ul gt         lt li  ngFor  quot let product of products quot  gt          lt  li gt     lt  ul gt      styleUrls      app component css      export class AppComponent implements OnInit     title    Angular Example      products  any    data as any  default     constructor       ngOnInit        console log data          Method 2  Reading Local JSON Files Using Angular HttpClient import   Component  OnInit   from   angular core   import   HttpClient   from  quot  angular common http quot      Component     selector   app-root     template    lt ul gt         lt li  ngFor  quot let product of products quot  gt          lt  li gt     lt  ul gt      styleUrls      app component css      export class AppComponent implements OnInit     title    Angular Example     products  any          constructor private httpClient  HttpClient      ngOnInit        this httpClient get  quot assets data json quot   subscribe data   gt         console log data         this products   data                Method 3  Reading Local JSON Files in Offline Angular Apps Using ES6  import Statement If your Angular application goes offline  reading the JSON file with HttpClient will fail  In this case  we have one more method to import local JSON files using the ES6  import statement which supports importing JSON files  But first we need to add a typing file as follows  declare module  quot   json quot      const value  any    export default value     Add this inside a new file json-typings d ts file in the src app folder  Now  you can import JSON files just like TypeScript 2 9   import   as data from  quot data json quot

User · Answer

I found this question when looking for a way to really read a local file instead of reading a file from the web server  which I d rather call a  remote file    Just call require   const content   require        path of your json      The Angular-CLI source code inspired me  I found out that they include component templates by replacing the templateUrl property by template and the value by a require call to the actual HTML resource   If you use the AOT compiler you have to add the node type definitons by adjusting tsconfig app json    compilerOptions        types     node

User · Answer

You have an alternative solution  importing directly your json   To compile  declare this module in your typings d ts file   declare module    json        const value  any      export default value      In your code  import   data json   from        path of your json    console log data json

User · Answer

Using Typescript 3 6 3  and Angular 6  none of these solutions worked for me   What did work was to follow the tutorial here which says you need to add a small file called njson-typings d ts to your project  containing this   declare module    json      const value  any    export default value      Once this was done  I could simply import my hardcoded json data   import employeeData from        assets employees json     and use it in my component   export class FetchDataComponent implements OnInit     public employees  Employee       constructor             Load the data from a hardcoded  json file     this employees   employeeData

User · Answer

First You have to inject HttpClient and Not HttpClientModule   second thing you have to remove  map  res any    gt  res json    you won t need it any more because the new HttpClient will give you the body of the response by default   finally make sure that you import HttpClientModule in your AppModule     import   HttpClient   from   angular common http    import   Observable   from  rxjs     Injectable   export class AppSettingsService       constructor private http  HttpClient            this getJSON   subscribe data   gt                console log data                          public getJSON    Observable lt any gt            return this http get    assets mydata json              to add this to your Component     Component       selector   mycmp       templateUrl   my component html       styleUrls    my component css      export class MyComponent implements OnInit       constructor          private appSettingsService   AppSettingsService                ngOnInit           this appSettingsService getJSON   subscribe data   gt                console log data

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