rx-to-json

RxJS 5 operator to write data into a JSON file

Work in both JavaScript and TypeScript

Installation

npm install rx-to-json

Use

Import this library and it will add toJSON operator to the rxjs Observable class.

public toJSON(path: string, options?: any): Observable

Parameters:

• path: JSON file path
• options: optional configuration for the JSON creation
  • header: JSON header. Default: [
  • footer: JSON footer. Default: ]

Example

Generate a JSON file from data flow:

import { Observable } from 'rxjs';
import 'rx-to-json';

let data = [
  { id: 1, name: 'Mike' },
  { id: 2, name: 'Tommy' }
];

Observable.of(...data)
  .toJSON('data.json')
  .subscribe();

// output file:
// [{"id":1,"name":"Mike"},{"id":2,"name":"Tommy"}]

Download data from a PostgreSQL dadtabase and save it as a JSON file:

import pgrx from 'pg-reactive';
import 'rx-to-json';

let db = new pgrx('connection string');

db.query('SELECT id, display_name FROM users')
  .map((row) => {
    // convert the data to match column names
    return {
      id: row.id,
      name: row.display_name
    };
  })
  .toJSON('data.json')
  .subscribe();

License

MIT