Running Angular CLI over HTTPS with a Trusted Certificate

Ruben Vermeulen
4 min readFeb 25, 2018

Running an Angular application over a secure connection is pretty straight forward. There are plenty of tutorials how you can enable this. However, you can run into some problems.

This blog post covers the basics to run your Angular application over HTTPS and the possible problems it can cause by doing so. At the end a solution is included to solve the most common problems.

Let’s get started!

Enabling SSL

The Angular CLI provides us with three parameters we can pass along with the ng serve command to enable and configure SSL.

// enable or disable SSL
--ssl <boolean: defaults to false>
// path to root certificate
--ssl-cert <string: defaults to "ssl/server.crt">
// path to private key
--ssl-key <string: defaults to "ssl/server.key">


Example #1

ng serve —-ssl true
  1. SSL is enabled
  2. Check whether there is a certificate and private key in the default ssl folder
  3. If nothing is found, the CLI will generate his own certificate and private key

Example #2

ng serve \
--ssl true \
--ssl-cert "/home/john/ssl/example.crt" \
--ssl-key "/home/john/ssl/example.key"
  1. SSL is enabled
  2. Check whether there is a certificate and private key in the given path
  3. If nothing is found, the CLI will generate his own certificate and private key


  1. The browser doesn’t trust our certificate, so we get a warning
  2. Disconnect and restart loop

Certificate is not trusted

This problem is pretty easy to bypass. We can just ignore the warning and continue to visit our application.

If you don’t experience the second problem and you can live with the fact you have an untrusted certificate, you can just stop right here and keep on developing your awesome application.

Disconnect and restart loop

This is a problem that comes and goes. The application can disconnect from the socket that listens to the event that restarts the application when a piece of code has changed. Along with the disconnect, the application restarts several times over and over again.

Disconnect and restart loop

Several people have/had this problem. There’s an issue reported in Github in the Angular repository.



To solve all the problems, the only thing we need is for our browser to trust our certificate. For some reason the Angular CLI doesn’t have any problems when we use a trusted certificate. So this means by using a trusted certificate both problems are solved.

Trusted secure connection


You should be all set. OS X has by default openssl installed.

Windows 10
Install openssl. I recommend using the Git bash. It has openssl preinstalled. Git Bash is bundled with the Git installer.

Step 1: Generate a certificate

Clone the following repository on your local machine and run the script in either the terminal or Git Bash. The repository contains all necessary configuration for creating a new trusted certificate.

git clone generate-trusted-ssl-certificatebash

You should now have a server.crt and a server.key file in the repository folder.

Step 2: Install the certificate

We have to make sure the browser trust our certificate, so we’re going to install it on our local machine.


  1. Double click on the certificate (server.crt)
  2. Select your desired keychain (login should suffice)
  3. Add the certificate
  4. Open Keychain Access if it isn’t already open
  5. Select the keychain you chose earlier
  6. You should see the certificate localhost
  7. Double click on the certificate
  8. Expand Trust
  9. Select the option Always Trust in When using this certificate
  10. Close the certificate window

The certificate is now installed.

Windows 10

  1. Double click on the certificate (server.crt)
  2. Click on the button “Install Certificate …”
  3. Select whether you want to store it on user level or on machine level
  4. Click “Next”
  5. Select “Place all certificates in the following store”
  6. Click “Browse”
  7. Select “Trusted Root Certification Authorities”
  8. Click “Ok”
  9. Click “Next”
  10. Click “Finish”
  11. If you get a prompt, click “Yes”

The certificate is now installed.

Step 3: Configure the application

Now our certificate is ready to be consumed we have to make sure our application uses the correct certificate.

Create a folder ssl in the application folder.

- e2e
- src
- ssl

Copy the private key and root certificate from step 1 into the ssl folder. Make sure the file names are like this:

server.key (private key)
server.crt (root certificate)

Before we run our application, make sure you have restarted your browser and updated the start script in package.json.

"start": "ng serve --ssl true"


The only thing we know have to do, is run our application.

npm start

You should now have a fully working application with a trusted certificate.

Feedback is appreciated!



Ruben Vermeulen

Software Engineer @ Sofico. Specializing in web & mobile. Currently exploring Angular and RxJS.