Read JSON

Reads the entire contents of a JSON file.

Installation

$ npm install utils-fs-read-json

Usage

var readJSON = require( 'utils-fs-read-json' );

readJSON( path, [ options,] clbk )

Reads the entire contents of a JSON file.

readJSON( '/path/to/data.json', onData );

function onData( error, data ) {
	if ( error ) {
		console.error( error );
	} else {
		console.log( data );
	}
}

The function accepts the same options as fs.readFile(), but encoding is always set to utf8. In addition, a JSON reviver may be provided.

var opts = {
	'reviver': reviver
};

readJSON( '/path/to/data.json', opts, onData );

function onData( error, data ) {
	if ( error ) {
		console.error( error );
	} else {
		console.log( data );
	}
}

function reviver( key, value ) {
	if ( key === 'beep' ) {
		return 'boop';
	}
	return value;
}

readJSON.sync( path[, options] )

Synchronously reads the contents of an entire JSON file.

var out = readJSON.sync( '/path/to/data.json' );
if ( out instanceof Error ) {
	throw out;
}
console.log( out );

The function accepts the same options as fs.readFileSync() and the asynchronous readJSON method above.

Examples

var path = require( 'path' ),
	readJSON = require( 'utils-fs-read-json' );

var file = path.join( __dirname, 'data.json' );

// Sync:
var data = readJSON.sync( file, 'utf8' );
// returns <object>

console.log( data instanceof Error );
// returns false

data = readJSON.sync( 'beepboop', {
	'encoding': 'utf8'
});
// returns <error>

console.log( data instanceof Error );
// returns true


// Async:
readJSON( file, onJSON );
readJSON( 'beepboop', onJSON );

function onJSON( error, data ) {
	if ( error ) {
		if ( error.code === 'ENOENT' ) {
			console.error( 'JSON file does not exist.' );
		} else {
			throw error;
		}
	} else {
		console.log( 'Beep: %s.', data.beep );
	}
}

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

License

MIT license.

Copyright

Copyright © 2015. Athan Reines.