A gulp plugin to transform JSON files, pipe JSON files through it and transform them to other JSON files or other text based formats.

First install gulp-json-transform as a development dependency:

npm install gulp-json-transform --save-dev

Then, add it to your gulpfile.js:

var jsonTransform = require('gulp-json-transform');

Then create a task that uses it:

gulp.task('do-something', function() {
	gulp.src('./app/**/*.json')
	.pipe(jsonTransform(function(data, file) {
		return {
			foobar: data.foo + file.relative
		};
	}))
	.pipe(gulp.dest('./dist/out/'));
});

Type: function

A function that takes the JSON object and a file object (parameters path, base and relative are exposed) as the input parameters and should return either a string which is written raw to the file, a JSON object which is stringified or a Promise which resolves to a string or a JSON object.

Example structure of the file object:

{
  path: 'test/fixtures/input.json',
  relative: 'input.json',
  base: 'test/fixtures'
}

Type: String or Number Default: undefined

JSON.stringify's whitespace attribute for pretty-printing the resulting JSON. See MDN docs on JSON.stringify() for more information.

MIT License