ES6 modules in the browser: Uncaught SyntaxError: Unexpected token import

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es6 modules browser support

I'm new to ES6 (ECMAScript 6), and I'd like to use its module system in the browser. I read ES6 is supported by Firefox and Chrome, but I'm getting the following error using export

Uncaught SyntaxError: Unexpected token import

I have a test.html file

<html>
    <script src="test.js"></script>
<body>
</body>
</html>

and a test.js file

'use strict';

class Test {

    static hello() {
        console.log("hello world");
    } 
}

export Test;    

Why?

Many modern browsers now support ES6 modules. As long as you import your scripts (including the entrypoint to your application) using <script type="module" src="..."> it will work.

Take a look at caniuse.com for more details: https://caniuse.com/#feat=es6-module

"Uncaught SyntaxError: Unexpected token {" while importing, You can specifically enable some es6 functionality (including import and export) in modern browsers using the "module" type in your script  (function (exports, require, module, __filename, __dirname) { import Vue from 'vue' ^^^ SyntaxError: Unexpected identifier I do have a jsconfig.json file in the root of my project directory which includes

You can try ES6 Modules in Google Chrome Beta (61) / Chrome Canary.

Reference Implementation of ToDo MVC by Paul Irish - https://paulirish.github.io/es-modules-todomvc/

I've basic demo -

//app.js
import {sum} from './calc.js'

console.log(sum(2,3));
//calc.js
let sum = (a,b) => { return a + b; }

export {sum};
<html> 
    <head>
        <meta charset="utf-8" />
    </head>

    <body>
        <h1>ES6</h1>
        <script src="app.js" type="module"></script>
    </body>

</html>

Hope it helps!

ES6 Modules: Getting Started Gotchas - Matt LaGrandeur, for modules. We'll go through common gotchas and what errors they throw in the browser console. The great thing about Modules is that you can import and export functionality between files. Uncaught SyntaxError: Unexpected identifier. JavaScript Modules with Import/Export Syntax (ES6) - JavaScript Tutorial - Duration: 12:38. dcode 9,325 views

Unfortunately, modules aren't supported by many browsers right now.

This feature is only just beginning to be implemented in browsers natively at this time. It is implemented in many transpilers, such as TypeScript and Babel, and bundlers such as Rollup and Webpack.

Found on MDN

Trouble exporting and importing a class - JavaScript, Uncaught SyntaxError: Unexpected token export ( at laser.js:1) You can only use es6 import/export with a compiler like babel or typescript. running it in the browser and using modules for my code (p5 is awesome as well,  Uncaught SyntaxError: Unexpected token import at the_path/test_entry.js:41 test_entry.js doesn't have 41 lines and doesn't contain import statements and anyway they should have been taken care of.

it worked for me adding type="module" to the script importing my mjs:

<script type="module">
import * as module from 'https://rawgit.com/abernier/7ce9df53ac9ec00419634ca3f9e3f772/raw/eec68248454e1343e111f464e666afd722a65fe2/mymod.mjs'

console.log(module.default()) // Prints: Hi from the default export!
</script>

See demo: https://codepen.io/abernier/pen/wExQaa

How to solve the unexpected identifier error when importing , the browser giving you this error: Unexpected Identifier. Unexpected identifier. Why? And how can you make ES6 modules work in browsers? It seems that Jest is missing the babel configuration in my package.json and the test suite is failing with 'Unexpected Token Import'. Please keep in mind that up until a week ago, this configuration was working successfully in several projects, so I am assuming it's a regression and figured I should report it.

Uncaught SyntaxError: Unexpected token import, ES6 modules in the browser: Uncaught SyntaxError: Unexpected token import. import react from 'react' uncaught syntaxerror: unexpected identifier uncaught  What this means that you’re using the native source code in the unaltered/unbundled state, leading to the following error: Uncaught SyntaxError: Cannot use import statement outside a module. You can fix the issue by building the script file and importing them.

JavaScript ES6 - How to fix Unexpected token import, Uncaught SyntaxError: Unexpected token import #4857 es6 · prod1 · prod2 · command · webpack dev · @klimashkin @bebraw @emkay properly in module section in your configuration with syntax-dynamic-import NODE_ENV without DefinePlugin , it imports node-libs-browser/~/process in that case  (function (exports, require, module, __filename, __dirname) { import ReactWrapper from './ReactWrapper'; SyntaxError: Unexpected token import. And if I look at the code of rafaelcichocki who create this issue, he has a local import from within a function, which seems to not work when moving to "module": "commonjs".

Uncaught SyntaxError: Unexpected token import · Issue #4857 , import * as testing from 'test'; console.log(testing);. I start up Uncaught SyntaxError: Unexpected token *. Running Do you have <script type="module"​> ? level 2 DarkMode: A micro library (~360B) for handling dark mode on browsers. The static import statement is used to import read only live bindings which are exported by another module. Imported modules are in strict mode whether you declare them as such or not. The import statement cannot be used in embedded scripts unless such script has a type="module" .

Comments
  • ES6 modules are not yet supported in the browser. Also you're still loading a script, not a module.
  • I still don't understand the difference between a script and a module
  • See here
  • The important part I have come to notice is <script type="module"></script> make sure you add that otherwise you will get that error. I was banging my head on the wall continually doing <script>import ... </script> knowingly that chrome is now said to support ES6 modules without flags, then I noticed that the type attribute was needed to specify to the browser that this is an ES6 module, without which you get that exact error.
  • I am using Chrome 68, I still see this error when we use import * from
  • U made my day. Cheers ;)
  • That's right... The important part I have come to notice is <script type="module"></script> make sure you add that otherwise you will get that error. I was banging my head on the wall continually doing <script>import ... </script> knowingly that chrome is now said to support ES6 modules without flags, then I noticed that the type attribute was needed to specify to the browser that this is an ES6 module.
  • { "message": "Uncaught SyntaxError: Unexpected token {", "filename": "stacksnippets.net/js", "lineno": 24, "colno": 8 }
  • I got above error by run your code snippet above, use chrome v67, why?
  • @hoogw Stackoverflow added that Run code snippet automatically. This code cannot be executed as is. You have to copy the code to index.html and separate .js files as showed above and try in the browser!
  • Thank useful answer. I removed snippet runner for you. (As I saw StackOverflow snippets can't to has more than one js source).
  • I read this feature was implemented in a Sof question, but theMDN source is actually more reliable.
  • According to the following link Chrome 61 should support import - it doesn't. medium.com/dev-channel/…
  • You have to add type="module" to your script tag.