Update 2021–10–26: Added note about using 4096 bits private key for better security. The commands in this guide are based on macOS, but Linux commands should be similar. In this guide, I will share the steps I take to generate self-signed certificates with you. This means that you should only use self-signed certificates in development environments. ![]() ![]() You can generate as many self-signed certificates on any domain or IP address as required, but because trusted CA does not sign them, browsers or client applications will hit “untrusted CA” error if you use them. To enable HTTPS for localhost development, you will need to generate self-signed certificates. You will still have another problem: trusted CA cannot sign a localhost domain SSL certificate. Another popular option would be LetsEncrypt, a trusted CA that signs SSL certificates for free. Sure, you can get an entry-level encryption level certificate from PositiveSSL that costs $10/year, but those are not recommended for production environments, notably e-commerce related sites. The price for a production-grade SSL certificate signed by a trusted CA is not low.
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