# Starting the development server

This page provides instructions on how to start Caplin Trader 5’s development server.

## Start the development server

To serve the application during development, follow the steps below:

1. From the root directory of your application, execute the command below to start a local web server:

   ```
   $ yarn run start
   ```
2. Open Google Chrome and navigate to <span>http://</span>localhost:8080

## Start the development server with HMR

CT5 supports Webpack’s [Hot Module Replacement](https://webpack.js.org/concepts/hot-module-replacement/) (HMR), which updates JavaScript modules while your application is running in a browser, without a full reload.

To start the development server with HMR enabled, follow the steps below:

1. From the root directory of your application, execute the command below:

   ```
   $ yarn run start -- --hot
   ```
2. Open Google Chrome and navigate to <span>http://</span>localhost:8080

## Troubleshooting

For information on common issues and their resolution, see the [Troubleshooting](building-an-application.md#troubleshooting) section in [Building an application](building-an-application.md).