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Intro to Doppler: Real-life Use Case


Managing secrets in an application can be a headache. You might have your secrets all over your application and you don’t want to cause chaos in your DevOps workflow. Doppler has got you covered in managing your secrets. In this tutorial we will look at how we can use doppler to manage and secure our secrets.


In this article we have an e-commerce store hooked up to firebase and a chatting system for the buyer to seller communications, both of these services need API keys for the application to function. We will look at how to set up a project in doppler, move our secrets from the traditional .env file in our project to doppler and setting a fallback for the secrets.

Secret Management

In most modern applications, you will most likely
be using digital authentication credentials (secrets). These secrets can be APIs, tokens, keys, and passwords used in our application or even in micro-services. Secret managers are a convenient and secure storage system for storing these digital authentication credentials (secrets). The secret manager provides a center or a single point or location where you can access and audit these secrets

The need for secret managers

By far the most critical component of any organization's security strategy is passwords and keys which are used to authenticate and set control access to critical systems and services. Because of how important it is for organizations to make sure that third parties do not have access to the business data or customer information, bring about the rise of secret managers

Doppler as a secret manager

I came across this wonderful service Doppler which has significantly increased my productivity. The Doppler secret manager makes life easier for developers as there is no need for storing application secrets as an environmental variable or have them hardcoded.
The Doppler CLI is a powerful tool that gives developers a centralized view of their app configuration in every environment. It allows them to easily access all of their secrets and provides them with a single, easy-to-use dashboard.
With all languages supported, the Doppler Secret Manager is designed to work seamlessly across all types of apps. Another amazing thing about the doppler service is the numerous integrations with other services like AWS, digital ocean, and other third-party deployment services making for a good developer experience.

Real World Use case: Market Place App

We have a real-world e-commerce site and in this section, we will be looking at how we can manage the secrets in this application. In our e-commerce site, we have used Firebase for our backend in authorizing users and as a database for storing application data.
We have integrated the app with a chat feature using the cometchat API, where buyers and sellers can discuss and agree before buying a product. We can’t achieve all these functionalities without the use of API keys for connecting with these third-party services. That's where Doppler comes in allowing us to secure our application secrets.

App Structure

     ┣ cometchat-pro-vue-chat-ui-kit 
     ┣ src
     ┃ ┣ Services
     ┃ ┃ ┗ productService.js
     ┃ ┣ assets
     ┃ ┣ components
     ┃ ┃ ┣ Navigation.vue
     ┃ ┃ ┗ Product.vue
     ┃ ┣ router
     ┃ ┃ ┗ index.js
     ┃ ┣ views
     ┃ ┃ ┣ Home.vue
     ┃ ┃ ┣ Login.vue
     ┃ ┃ ┣ NewProduct.vue
     ┃ ┃ ┣ ProductShow.vue
     ┃ ┃ ┗ Register.vue
     ┃ ┣ App.vue
     ┃ ┗ main.js
     ┣ .browserslistrc
     ┣ .editorconfig
     ┣ .env
     ┣ .eslintrc.js
     ┣ .gitignore
     ┣ babel.config.js
     ┣ mockData.json
     ┣ package.json
     ┣ postcss.config.js
     ┣ tailwind.config.js
     ┣ vue.config.js
     ┗ yarn.lock
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Above, we have our file structure and the main focus here is our .env file that contains all the secrets for our application to connect to both firebase and the cometchat service. In the .env file, we have

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Setting up Doppler

To use Doppler we first create an account. After creating an account, we are prompted to create a workspace that you can name whatever you want. Then Doppler provides a user-friendly walkthrough to show you where and what some functionalities are.

Creating a Project

Creating a project with Doppler is very straightforward. Although doppler comes with an example project already set up, you can click on the plus icon to create a new project. In my case, I will call the project etsy-ecommerce

Once you create a project, Doppler immediately provides you with three environments which are the

  • Development
  • Staging
  • Production

The environment provided by doppler is where we manage secrets we will be using in our application and API configurations.

Installing Doppler

In this section, we will talk about how to get you started with using the Doppler CLI and managing your secrets. In the Doppler installation guide, there are different shell commands for installing the CLI. I’m using Ubuntu, so there will be a difference in the command for installation.

# Install pre-reqs
sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl gnupg

# Add Doppler's GPG key
curl -sLf --retry 3 --tlsv1.2 --proto "=https" '' | sudo apt-key add -

# Add Doppler's apt repo
echo "deb any-version main" | sudo tee /etc/apt/sources.list.d/doppler-cli.list

# Fetch and install latest doppler cli
sudo apt-get update && sudo apt-get install doppler
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After running the commands above, we can check if the CLI is successfully installed by running

doppler --version
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We need a way for our local machine to authenticate with doppler to pull in secrets. We can do this by running

doppler login
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We will be asked to open a browser window, where we will authenticate with our email, then an auth token to log in will appear in our terminal which we can use to authenticate doppler.

All we have to do now is choose our workspace and if we check our terminal, we can see we have received a welcome message.

Using Doppler to Manage Our App Secret

We want to replace the .env file in our project, so we copy all the content we have in the .env file and paste it as our secret in development build in doppler and save it.

Now the secrets have been registered successfully and we can now delete the .env file in our project.

In our terminal, we run the setup command to configure doppler

doppler setup
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we choose the project we are working on which is etsy-ecommerce and select the environment, in this case, the development environment. We can now run our application. Instead of the regular way of starting the project which is yarn run serve, we will use

doppler run -- yarn serve
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What this command does is it fetches the latest secrets that we stored in doppler and injects them as environmental variables in the node.js process. Now we can delete the .env file from our project and everything is working perfectly.
To update the secrets in doppler all we have to do is change the secret value and restart our app and our secrets are automatically updated.


We have come to the end of the tutorial. We looked at how to set up a project in doppler, move our secrets from the traditional .env file in our project to doppler and, updating our secrets.

Top comments (4)

samaby profile image

I think this secret manager will be good on medium to large scale projects, not so much for small or simple projects.

tammibriggs profile image
Taminoturoko Briggs

I have never heard of this service.
Thanks for enlightening me.

pken1 profile image
Info Comment hidden by post author - thread only accessible via permalink

Nice post.
I will give the doppler service a try in my next project.

miracleio profile image

Thanks for great read man!
This is worth checking out 🙌🏾🙌🏾

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