upt-json

Read upt.json files with semantics, normalisation, defaults and validation.

Usage

.read(file, options, callback)

Reads file and applies normalisation, defaults and validation according to the upt.json spec.
If the passed file does not exist, the callback is called with error.code equal to ENOENT.
If the passed file contents are not valid JSON, the callback is called with error.code equal to EMALFORMED.
If the json does not comply with the upt.json spec, the callback is called with error.code equal to EINVALID.

If file is a directory, find() will be used to search for the json file.
The options argument is optional and can be omitted. These options will be passed to parse method.

var uptJson = require('upt-json');

// Can also be used by simply calling uptJson()
uptJson.read('/path/to/upt.json', function (err, json) {
    if (err) {
        console.error('There was an error reading the file');
        console.error(err.message);
        return;
    }

    console.log('JSON: ', json);
});

.parse(json, options)

Parses an object. Useful when you want to apply normalisation and validation directly to an object.
If the json does not comply with the upt.json spec, an error is thrown with error.code equal to EINVALID.

The options arguments is optional and can be omitted. Available options:

• validate: Apply validation, defaults to true
• normalize: Apply normalisation, defaults to false
• clone: clone, use and return the passed in json object instead of using it directly, defaults to false

var uptJson = require('upt-json');

var json = {
    name: 'my-package',
    version: '0.0.1'
};

try {
    uptJson.parse(json);
} catch (err) {
    console.error('There was an error parsing the object');
    console.error(err.message);
}

.validate(json)

Validates the passed json object.
Throws an error with error.code equal to EINVALID if it does not comply with the spec.

var uptJson = require('upt-json');

var json = {
    name: 'my-package',
    version: '0.0.1'
};

try {
    uptJson.validate(json);
} catch (err) {
    console.error('There was an error validating the object');
    console.error(err.message);
}

.normalize(json)

var uptJson = require('upt-json');

var json = {
    name: 'my-package',
    version: '0.0.1',
    main: 'foo.js,bar.js'
};

uptJson.nornalize(json);
json.main // ['foo.js', 'bar.js']

.find(folder, callback)

Finds the json filename inside a folder.
Checks if a upt.json exists, falling back to component.json (deprecated) and .upt.json.
If no file was found, the callback is called with a error.code of ENOENT.

var uptJson = require('upt-json');

uptJson.find('/path/to/folder', function (err, filename) {
    if (err) {
        console.error('There is no json file in the folder');
        return;
    }

    console.log('Filename: ', filename);

    // Now that we got the filename, we can read its contents
    uptJson.read(filename, function (err, json) {
        if (err) {
            console.error('There was an error reading the file');
            console.error(err.message);
            return;
        }

        console.log('JSON: ', json);
    });
});