diff --git a/lib/shared/cliOptions.js b/lib/shared/cliOptions.js
index e6ed0dda..e77a8f19 100644
--- a/lib/shared/cliOptions.js
+++ b/lib/shared/cliOptions.js
@@ -53,7 +53,7 @@ module.exports = {
       'Print a plaintext list of tasks for the loaded gulpfile.'),
   },
   'tasks-json': {
-    type: 'boolean',
+    type: 'string',
     desc: chalk.gray(
       'Print the task dependency tree, ' +
       'in JSON format, for the loaded gulpfile.'),
diff --git a/lib/versioned/^4.0.0-alpha.1/index.js b/lib/versioned/^4.0.0-alpha.1/index.js
index 4f949216..71ef9467 100644
--- a/lib/versioned/^4.0.0-alpha.1/index.js
+++ b/lib/versioned/^4.0.0-alpha.1/index.js
@@ -1,5 +1,7 @@
 'use strict';
 
+var fs = require('fs');
+
 var chalk = require('chalk');
 var gutil = require('gulp-util');
 var tildify = require('tildify');
@@ -35,9 +37,12 @@ function execute(opts, env) {
       });
     }
     if (opts.tasksJson) {
-      return console.log(
-        JSON.stringify(gulpInst.tree({ deep: true }), null, 2)
-      );
+      var output = JSON.stringify(gulpInst.tree({ deep: true }));
+      if (typeof opts.tasksJson === 'boolean' && opts.tasksJson) {
+        return console.log(output);
+      } else {
+        return fs.writeFileSync(opts.tasksJson, output, 'utf-8');
+      }
     }
     try {
       gutil.log('Using gulpfile', chalk.magenta(tildify(env.configPath)));