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When you trigger a deploy, <ProductName /> **builds** your project. For many frontend frameworks, <ProductName /> automatically configures the build settings, but you can also [customize](#customizing-build-settings) them. You can also use [environment variables](#using-environment-variables-and-secrets) to avoid hardcoding values.
When you trigger a deploy, <ProductName /> **builds** your project. For many frontend frameworks, <ProductName /> automatically configures the build settings, but you can also [customize](#customizing-build-settings) them. You can also use [environment variables](#environment-variables) to avoid hardcoding values.
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## Customizing Build Settings
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/>
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<Caption>Selecting the <b>Settings</b> tab from the Project Overview page.</Caption>
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You can then edit the build settings from the **Build & Development Settings** and **Root Directory** sections.
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You can then edit the build settings from the **Build & Development Settings**, **Root Directory**, and **Environment Variables** sections.
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### Build & Development Settings
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deployment.
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</Note>
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## Using Environment Variables and Secrets
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When building your project, it may be necessary to use [environment variables](https://en.wikipedia.org/wiki/Environment_variable).
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Adding environment variables requires two steps, defining the environment variable, then making it available to your projects' build step.
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<Note>
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This section covers how to make environment variables available at{''}
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<b>Build Time</b>, if you would like to make them available during{''}
To define an environment variable, you should use **Now Secrets**. By using **Now Secrets**, the data will be encrypted and stored securely, no longer directly accessible by anyone, and only exposed to deployments as environment variables.
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Adding **Now Secrets** can be done with [Now CLI](/download), providing three options to work with them.
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<Note>
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When adding Now Secrets with Now CLI, the secret name is automatically
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lowercased before being stored.
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</Note>
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To **define a Now Secret**, use the following command:
<Caption>Defining a <b>Now Secret</b> using <Linkhref="/now">Now CLI</Link>.</Caption>
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Environment Variables are accessible during both **Build Step** and **Runtime**, and can be configured for **Production**, **Preview**, and **Development** Environments individually.
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To **remove a Now Secret**, use the following command:
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This allows you to include values that you don't want to share in your code or to change the behavior of your code depending on its Environment.
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<Snippetdarktext="now secrets rm <secret-name>"/>
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<Caption>Removing a <b>Now Secret</b> using <Linkhref="/now">Now CLI</Link>.</Caption>
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To declare an Environment Variable for your deployment, head to the **General** page of your **Project Settings** and locate the **Environment Variables** section.
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To **rename a Now Secret**, use the following command:
|**Production**| When selected, the Environment Variable will be applied to your next Production Deployment. To create a Production Deployment, push a commit to the default branch or run `now --prod`. |
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|**Preview**| The Environment Variable is applied to your next Preview Deployment. Preview Deployments are created when you push to a branch (for example, `my-new-feature`) or run `now`. |
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|**Development**| The Environment Variable is for use when running your project locally, with `now dev` or your preferred development command. To download Development Environment Variables, run `now env pull`. |
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To provide your project with environment variables during the Build Step, you should create a `now.json` file like the one below:
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Enter the **Name** of the Environment Variable. For example, if you are using Node.js and you create an Environment Variable named `SENTRY_KEY`, it will be available under `process.env.SENTRY_KEY` in your code.
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```json
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{
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"build": {
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"env": {
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"VARIABLE_NAME": "@secret-name"
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}
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}
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}
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```
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Then, enter the **Value** of the Environment Variable. The value is automatically encrypted and stored as a _Secret_ in our system when you click **Add**.
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<Caption>
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An example <InlineCode>now.json</InlineCode> file that provides an
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application's build step with a defined environment variable.
<Caption>Adding an Environment Variable in the Project Settings.</Caption>
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When providing environment variables to your application, the value should always be prefixed with `@`, followed by the name of the [Now Secret](#adding-secrets) or environment variable name if using a `.env.build` file [during local development](#during-local-development).
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Once added, the Environment Variable is applied to your subsequent deployment.
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It can then be consumed during **Build Step** by the framework of your choice, or by a Serverless Function at **Runtime**.
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To use the environment variable from inside the application you would need to reference it using the correct syntax for the language being used. For example, using Node.js, the syntax would be:
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<Note>
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If any Environment Variables differ between Deployments,{''}
will always be bypassed. For example, this means that merging to the default
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branch will no longer result in an instant deployment.
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</Note>
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```
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process.env.VARIABLE_NAME
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```
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### Development Environment Variables
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<Caption>
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Accessing a defined environment variable from within a Node.js application.
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</Caption>
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Environment Variables created for the Development Environment can be downloaded into a local development setup using the `now env pull` command provided by [Now CLI](/download):
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Now, whenever the `process.env.VARIABLE_NAME` key is used, it will provide the application's build step with the value declared by the referenced **Now Secret**.
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<Snippetclipboard={false}darktext={`now env pull
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Downloading Development Environment Variables for project my-lovely-project
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✅ Created .env file [510ms]`} />
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<Caption>Downloading Development Environment Variables with `now env pull`.</Caption>
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## During Local Development
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Running the command will create a `.env` file in your project folder. The `.env` file can then be consumed by `now dev` or
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your preferred development command.
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When using `now dev` to develop your application locally if you require the use of [Serverless Functions](/docs/v2/serverless-functions/introduction), [Now Secrets](#adding-secrets) are not available. This is a security measure, to prevent accidental use of production secrets during development.
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Check out the [Now CLI reference](/docs/now-cli#commands/env)to learn more about `now env` commands.
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To use environment variables during local development, create a `.env.build` file at the root of your project directory, for example:
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### Integration Environment Variables
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```
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VARIABLE_NAME=variable_value
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```
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[Integrations](/integrations) can automatically add Environment Variables to your Project Settings.
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In that case, the Integration Configuration that added it will be displayed:
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<Caption>
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An example <InlineCode>.env.build</InlineCode> file that provides the Build
<Caption>Adding an Integration Environment Variable in the Project Settings.</Caption>
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<Notetype="warning">
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Usage of a <InlineCode>.env.build</InlineCode> file is only possible during
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local development and will not be made available when deploying for security
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reasons.
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<Note>
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Support for Integration Environment Variables was added on April 10th, 2020.
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Variables added before that date do not have the <Strong>Integration</Strong>{''}
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indication.
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</Note>
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### Updating Environment Variables
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Environment variables are made available to the build step, meaning that they do not update in the application unless it is redeployed.
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### System Environment Variables
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If you change the value of a [Now Secret](#adding-secrets) or environment variable and want your application to be aware of this, you should create a new deployment.
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ZEIT provides a set of Environment Variables that are optionally populated by the System, such as the URL of the Deployment or the name of the Git branch deployed.
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### Reserved Variables
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To apply a System Environment Variable to your Deployment, enter its **Name**, leave the **Value** empty, and click **Add**.
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The <ProductName /> platform reserves the usage of some environment variable names by default. You can find a list of these names in the [limits documentation](/docs/v2/platform/limits/#reserved-variables).
The <ProductName /> platform reserves the usage of some Environment Variable names by default. You can find a list of these names in the [limits documentation](/docs/v2/platform/limits/#reserved-variables).
You may want to use different workflows and APIs based on on Git information. To support this, <ProductName /> will deploy your app with the following built-in environment variables when deploying with <ProductName /> for Bitbucket.
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<Notelabel="hint">
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These environment variables are available at both{''}
You may want to use different workflows and APIs based on Git information. To support this, the following [System Environment Variables](/docs/v2/build-step#system-environment-variables) can be added to your deployment:
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#### Deployment Authorizations for Forks
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If you receive a pull request from a fork of your repository and there is either a change to the [`now.json`](/docs/configuration) file or there are [secrets](/docs/v2/serverless-functions/env-and-secrets#adding-secrets) used in your project; Now will require an authorization from you or a member of your team to deploy the pull request.
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If you receive a pull request from a fork of your repository and there is either a change to the [`now.json`](/docs/configuration) file or there are [Environment Variables](/docs/v2/build-step#environment-variables) used in your project; Now will require an authorization from you or a member of your team to deploy the pull request.
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This behavior protects you and your project from a leak of sensitive information.
You may want to use different workflows and APIs based on Git information. To support this, <ProductName /> will deploy your app with the following built-in environment variables when deploying with <ProductName /> for GitHub.
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<Notelabel="hint">
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These environment variables are available at both{''}
You may want to use different workflows and APIs based on Git information. To support this, the following [System Environment Variables](/docs/v2/build-step#system-environment-variables) can be added to your deployment:
![kodiakhq[bot]](https://avatars.githubusercontent.com/in/29196?v=4&size=40){kind=avatar}
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