copy-json-file-merged

Copies source JSON file and merges its contents with destination JSON file if present.

Installation

npm install copy-json-file-merged --save

Usage

In code:

var copyJsonFileMerged = require('copy-json-file-merged');
copyJsonFileMerged('src.json', 'dest.json', {
    overwrite: true,
    mergeKey: 'id'
});

From CLI:

./node_modules/.bin/copy-json-file-merged src.json dest.json --overwrite --mergeKey id

From package.json's scripts:

{
  "scripts": {
    "copy": "copy-json-file-merged src.json dest.json --overwrite --mergeKey id"
  }
}

API

copyJsonFileMerged function accepts three arguments:

• src — path to source JSON file (must exist);
• dest — path to destination JSON file (can exist);
• options — object of properties (optional):

  • mergeKey — a key (property) to merge nested objects and arrays by (see merge arrays uniting their object items by specified identifier field), by default is id;

  • overwrite — shows whether source object should overwrite destination one (if it exists), by default is false; alternatively, an array of top-level properties' names of source JSON object can be passed to limit sections of destination JSON file to overwrite, e.g.:

    src.json

    {
      "obj1": { "merged": true },
      "obj2": { "merged": true }
    }

    dest.json

    {
      "obj1": { "merged": false },
      "obj2": { "merged": false }
    }

    copyJsonFileMerged('src.json', 'dest.json', {
        overwrite: ['obj1']
    }); // => { "obj1": { "merged": true }, "obj2": { "merged": false } }

Building

In order to build library run:

npm run build

Testing

Run unit tests:

npm test

In order to run tests with coverage run the following command:

npm run test:coverage

In order to run tests with Coveralls locally you have to provide COVERALLS_REPO_TOKEN:

COVERALLS_REPO_TOKEN=<token> npm run test:coveralls

Contribution

Before making a pull request, please, be sure that your changes are rebased to develop branch.

License

MIT