validate.js

var validate = require('sourcemap-validator')
  , fs = require('fs')
  , assert = require('assert')
  , myArgs = process.argv.slice(2)
  , min = fs.readFileSync(myArgs[0], 'utf-8')
  , map = fs.readFileSync(myArgs[1], 'utf-8');

// Browserify bundles have inline sourceContent in their maps
// so no need to pass a `sourceContent` object.
assert.doesNotThrow(function () {
  validate(min, map);
}, 'The sourcemap is not valid');