# Can't get the hello-world-js example to work

**URL:** <https://community.temporal.io/t/cant-get-the-hello-world-js-example-to-work/5046>\
**Category:** Community Support\
**Tags:** typescript-sdk\
**Created:** [June 23, 2022, 2:31pm UTC](https://community.temporal.io/t/cant-get-the-hello-world-js-example-to-work/5046 "2022-06-23T14:31:46Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![animesh](https://sea2.discourse-cdn.com/flex016/user_avatar/community.temporal.io/animesh/32/1356_2.png) [@animesh](https://community.temporal.io/u/animesh)\
**Post date:** [June 23, 2022, 2:31pm UTC](https://community.temporal.io/t/cant-get-the-hello-world-js-example-to-work/5046/1 "2022-06-23T14:31:46Z")

</div>

Hi, i checked out the [GitHub - temporalio/samples-typescript](https://github.com/temporalio/samples-typescript) repo to try out temporal in javascript.

I am trying to run the hello-world-js example - [samples-typescript/hello-world-js at main · temporalio/samples-typescript · GitHub](https://github.com/temporalio/samples-typescript/tree/main/hello-world-js)

The workflow starts fine - `src/client.js` file

The worker fails to start - `node src/worker.js`

I am getting the following error (pasting the first few stacktraces, it goes on like this for a bit)

```auto
 hello-world-js % node src/worker.js
2022-06-23T14:24:23.421Z [INFO] asset main.js 218 KiB [emitted] (name: main) 1 related asset
2022-06-23T14:24:23.422Z [INFO] runtime modules 1.77 KiB 4 modules
2022-06-23T14:24:23.422Z [INFO] modules by path ./node_modules/@temporalio/ 151 KiB
2022-06-23T14:24:23.422Z [INFO] modules with warnings 90.9 KiB [warnings] 11 modules
2022-06-23T14:24:23.422Z [INFO] modules by path ./node_modules/@temporalio/common/lib/ 46.9 KiB
2022-06-23T14:24:23.422Z [INFO] modules by path ./node_modules/@temporalio/common/lib/converter/*.js 27 KiB 8 modules
2022-06-23T14:24:23.422Z [INFO] modules by path ./node_modules/@temporalio/common/lib/*.js 19.9 KiB 2 modules
2022-06-23T14:24:23.422Z [INFO] modules by path ./node_modules/@temporalio/internal-workflow-common/lib/*.js 13.5 KiB
2022-06-23T14:24:23.422Z [INFO] ./node_modules/@temporalio/internal-workflow-common/lib/index.js 1.3 KiB [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] + 9 modules
2022-06-23T14:24:23.423Z [INFO] modules by path ./src/*.js 698 bytes
2022-06-23T14:24:23.423Z [INFO] ./src/workflows-entrypoint-a6fc37e5-d452-4a7d-8147-bc3e060b8689.js 449 bytes [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] ./src/workflows.js 249 bytes [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] __temporal_custom_payload_converter (ignored) 15 bytes [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] ./node_modules/long/src/long.js 39.2 KiB [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] ./node_modules/ms/index.js 2.95 KiB [built] [code generated]
2022-06-23T14:24:23.423Z [INFO] 
2022-06-23T14:24:23.423Z [INFO] WARNING in ./node_modules/@temporalio/workflow/lib/alea.js
2022-06-23T14:24:23.423Z [INFO] Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
2022-06-23T14:24:23.423Z [INFO] Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/alea.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/alea.ts'
2022-06-23T14:24:23.423Z [INFO] Error: Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/alea.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/alea.ts'
2022-06-23T14:24:23.423Z [INFO] at fetchFromFilesystem ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/utils.js:129:11)
2022-06-23T14:24:23.423Z [INFO] at runNextTicks (node:internal/process/task_queues:61:5)
2022-06-23T14:24:23.423Z [INFO] at processImmediate (node:internal/timers:437:9)
2022-06-23T14:24:23.423Z [INFO] at async fetchFromURL ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/utils.js:239:9)
2022-06-23T14:24:23.423Z [INFO] at async [redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/index.js:105:11
2022-06-23T14:24:23.423Z [INFO] at async Promise.all (index 0)
2022-06-23T14:24:23.424Z [INFO] at async Object.loader ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/index.js:89:27)
2022-06-23T14:24:23.424Z [INFO] @ ./node_modules/@temporalio/workflow/lib/worker-interface.js 34:15-32
2022-06-23T14:24:23.424Z [INFO] @ ./src/workflows-entrypoint-a6fc37e5-d452-4a7d-8147-bc3e060b8689.js 1:0-68 4:0-19 5:0-18 16:0-15
2022-06-23T14:24:23.424Z [INFO] 
2022-06-23T14:24:23.424Z [INFO] WARNING in ./node_modules/@temporalio/workflow/lib/cancellation-scope.js
2022-06-23T14:24:23.424Z [INFO] Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
2022-06-23T14:24:23.424Z [INFO] Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/cancellation-scope.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/cancellation-scope.ts'
2022-06-23T14:24:23.424Z [INFO] Error: Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/cancellation-scope.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/cancellation-scope.ts'
2022-06-23T14:24:23.424Z [INFO] at fetchFromFilesystem ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/utils.js:129:11)
2022-06-23T14:24:23.424Z [INFO] at async fetchFromURL ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/utils.js:239:9)
2022-06-23T14:24:23.424Z [INFO] at async [redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/index.js:105:11
2022-06-23T14:24:23.424Z [INFO] at async Promise.all (index 0)
2022-06-23T14:24:23.424Z [INFO] at async Object.loader ([redacted]/temporal-samples-typescript/hello-world-js/node_modules/source-map-loader/dist/index.js:89:27)
2022-06-23T14:24:23.424Z [INFO] @ ./node_modules/@temporalio/workflow/lib/worker-interface.js 35:29-60
2022-06-23T14:24:23.424Z [INFO] @ ./src/workflows-entrypoint-a6fc37e5-d452-4a7d-8147-bc3e060b8689.js 1:0-68 4:0-19 5:0-18 16:0-15
2022-06-23T14:24:23.425Z [INFO] 
2022-06-23T14:24:23.425Z [INFO] WARNING in ./node_modules/@temporalio/workflow/lib/errors.js
2022-06-23T14:24:23.425Z [INFO] Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
2022-06-23T14:24:23.425Z [INFO] Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/errors.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/errors.ts'
2022-06-23T14:24:23.425Z [INFO] Error: Failed to parse source map from '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/errors.ts' file: Error: ENOENT: no such file or directory, open '[redacted]/temporal-samples-typescript/hello-world-js/node_modules/@temporalio/workflow/src/errors.ts'

```

Please help.

---

<div class="post-metadata">

**Author:** ![loren](https://sea2.discourse-cdn.com/flex016/user_avatar/community.temporal.io/loren/32/5099_2.png) [@loren](https://community.temporal.io/u/loren)\
**Post date:** [June 23, 2022, 7:45pm UTC](https://community.temporal.io/t/cant-get-the-hello-world-js-example-to-work/5046/2 "2022-06-23T19:45:40Z")

</div>

Hi, sorry about that! It will be fixed in the next release. In the meantime, they’re safe to ignore—your Worker should run fine after all those `Failed to parse source map` errors.

---

<div class="post-metadata">

**Author:** ![animesh](https://sea2.discourse-cdn.com/flex016/user_avatar/community.temporal.io/animesh/32/1356_2.png) [@animesh](https://community.temporal.io/u/animesh)\
**Post date:** [June 24, 2022, 4:05am UTC](https://community.temporal.io/t/cant-get-the-hello-world-js-example-to-work/5046/3 "2022-06-24T04:05:44Z")

</div>

My bad. I didn’t realize that was not a blocking error! the actual error was down there, it just missed my eyes.

I was getting it because I was trying to connect to a remote temporal server and I was using the wrong connection class.

If it helps anyone, here’s the updated example to connect to a remote instance in javascript.

```auto
import {NativeConnection, Worker} from '@temporalio/worker';
import { URL } from 'url';
import * as activities from './activities.js';

async function run() {
  // Step 1: Register Workflows and Activities with the Worker and connect to
  // the Temporal server.
  const connection = await NativeConnection.connect({
    // // Connect to localhost with default ConnectionOptions.
    // // In production, pass options to the Connection constructor to configure TLS and other settings:
    address: '<host>:<port>', // of remote temporal server
    // tls: {} // as provisioned
  });

  const worker = await Worker.create({
    activities,
    workflowsPath: new URL('./workflows.js', import.meta.url).pathname,
    connection,
    taskQueue: 'hello-javascript',
    namespace: '<your_namespace>'
  });
  // Worker connects to localhost by default and uses console.error for logging.
  // Customize the Worker by passing more options to create():
  // https://typescript.temporal.io/api/classes/worker.Worker
  // If you need to configure server connection parameters, see docs:
  // https://docs.temporal.io/typescript/security#encryption-in-transit-with-mtls

  // Step 2: Start accepting tasks on the `hello-javascript` queue
  await worker.run();

  // You may create multiple Workers in a single process in order to poll on multiple task queues.
}

run().catch((err) => {
  console.error(err);
  process.exit(1);
});

```