"An error occurred stating that _co.JSON is not defined in

Question

"An error occurred stating that _co.JSON is not defined in

During my attempt to convert an object into a string using the JSON method, I encountered an error upon loading my page:

Error: _co.JSON is undefined

The stacktrace for this error message is extensive and seems unnecessary to include at this point.

The following code snippet is responsible for triggering the error:

<div *ngFor="let asset of getAssets()">
      {{ JSON.stringify(asset) }}
</div>

All the elements within the array returned by my backend code are indeed valid objects.

This output displays the result of running ng --version:

    _                      _                 ____ _     ___
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
               |___/

Angular CLI: 1.7.4
Node: 8.9.1
OS: win32 x64
Angular: 5.2.9
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 1.7.4
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.5.3
webpack: 3.11.0

javascript json angular typescript

Answer 1

Answer №1

While JSON may not be a common term in templates, you can utilize the json pipe method:

{{ asset | json }}

Answer 2

While JSON may not be a common term in templates, you can utilize the json pipe method:

{{ asset | json }}

Answer 3

Answer №2

Your component template interpolation relies on the context being the component itself, rather than the window object.

To achieve this, you need to "declare" JSON within your component class:

@Component({...})
export class MyComponent {
    private JSON = window.JSON; 
    ...
}

Answer 4

Your component template interpolation relies on the context being the component itself, rather than the window object.

To achieve this, you need to "declare" JSON within your component class:

@Component({...})
export class MyComponent {
    private JSON = window.JSON; 
    ...
}

Answer 5

Answer №3

The issue I encountered was attempting to manipulate an array inside a Promise.then block. By refactoring my code to utilize await, I successfully resolved the problem.

Instead of the previous implementation, which looked like this:

getAssets() {
  assetSet = new Set();
  for (let asset of this.assets) {
    assetSet.add(JSON.parse(asset);
  }
  return Array.from(assetSet);
} 

onSearchInputChange() {
  somePromiseFunction().then(response => this.assets = response);
}

I made the following adjustment:

getAssets() {
  assetSet = new Set();
  for (let asset of this.assets) {
    assetSet.add(JSON.parse(asset);
  }
  return Array.from(assetSet);
} 

async onSearchInputChange() {
  this.assets = await somePromiseFunction();
}

Answer 6

The issue I encountered was attempting to manipulate an array inside a Promise.then block. By refactoring my code to utilize await, I successfully resolved the problem.

Instead of the previous implementation, which looked like this:

getAssets() {
  assetSet = new Set();
  for (let asset of this.assets) {
    assetSet.add(JSON.parse(asset);
  }
  return Array.from(assetSet);
} 

onSearchInputChange() {
  somePromiseFunction().then(response => this.assets = response);
}

I made the following adjustment:

getAssets() {
  assetSet = new Set();
  for (let asset of this.assets) {
    assetSet.add(JSON.parse(asset);
  }
  return Array.from(assetSet);
} 

async onSearchInputChange() {
  this.assets = await somePromiseFunction();
}

"An error occurred stating that _co.JSON is not defined in

Answer №1

Answer №2

Answer №3

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