# Angular 2 Pretty Json v3.0.0
A module for Angular 2 debug output of objects. Contains a pipe similar to [JsonPipe](https://angular.io/docs/ts/latest/api/common/index/JsonPipe-class.html) but adds support for spacing and handling of circular structures.
Also contains a component that outputs any object with syntax highlight.
**Warning**: just as the `JsonPipe`, this is an impure pipe and should be used only for debugging purposes.
**Breaking change in 3.0.0** The UMD bundle has moved to a "bundle" subdirectory. SymstemJS users should update their system.config. Should not affect AngularCLI and other webpack projects.
## Install
```
npm install angular2-prettyjson
```
## ES2015 / UMD
Two versions are available: ES2015 modules and UMD. If you are using a project based on the AngularCLI, everything should work from a simple npm install.
If you are using the Angular Quickstart template (or other SystemJS based compilation), please point to the bundle `angular2-prettyjson.umd.min.js` file
e.g. `systemjs.config.js`:
```
map: {
...
// other libraries
'rxjs': 'npm:rxjs',
'angular2-prettyjson': 'npm:angular2-prettyjson'
},
packages: {
...,
'angular2-prettyjson': {
defaultExtension: 'js',
main: './bundles/angular2-prettyjson.umd.min.js'
}
```
## Usage
Import PrettyJsonModule to have access to following component and pipes
```js
import {PrettyJsonModule} from 'angular2-prettyjson';
@NgModule({
declarations: [
AppComponent,
],
imports: [
PrettyJsonModule,
],
providers: [
],
bootstrap: [AppComponent]
})
export class AppModule {
}
```
### Safe Pipe
The `SafeJsonPipe` aims to override the `JsonPipe` and so uses the same name "json". It also accepts an optional argument `spaces=2` for the JSON stringify spacing.
```js
@Component({
....
template: `
{{ circularObj | json }}
{{ circularObj | json:4 }}
` // make sure to use a surrounding element with white-space: pre; for best results
})
...
```
outputs
2 spaces (default):
4 spaces:
#### Overriding JsonPipe throughout the app
If you want the Safe Pipe to be used throughout the app:
```js
import {PrettyJsonModule, SafeJsonPipe} from 'angular2-prettyjson';
import {JsonPipe} from '@angular/common';
@NgModule({
declarations: [
AppComponent,
],
imports: [
PrettyJsonModule,
],
providers: [
{ provide: JsonPipe, useClass: SafeJsonPipe }
],
bootstrap: [AppComponent]
})
export class AppModule {
}
```
### Pretty (and safe) Pipe
The `PrettyJsonPipe` stringifies the object and then adds spans around properties, `null`, arrays etc. You can bind it to the innerHtml of other elements.
```js
@Component({
....
template: `
`
})
...
```
A good set of styles to use is
```css
pre span {white-space: normal;}
.string { color: green; }
.number { color: darkorange; }
.boolean { color: blue; }
.null { color: magenta; }
.key { color: red; }
```
If you wish to use the `styles` property of the parent component, please prefix each class selector with `:host /deep/`
e.g.
```js
@Component({
....
template: `
`,
styles: [`:host /deep/ .string {color:green} ...`]
})
...
```
See output under component below.
### Component
Creates a `pre` element into which the Pretty Json pipe'd object is dumped as HTML. Takes care of styling.
Takes an input `[obj]` that can be data bound to any object.
```js
import {PrettyJsonComponent} from 'angular2-prettyjson';
@Component({
....
entryComponents: [PrettyJsonComponent], // Add to entry components
template: `
`
})
export class MyComponent {
ngOnInit() {
this.theForm = this.formBuilder.group({
...
```
outputs
