Create a trusted certificate for local development on MacOS 1. Copy openSSL config to local temp file cp /System/Library/OpenSSL/openssl.cnf ~/openssl-temp.cnf 2. Add Subject Alternative Name to openssl-temp.cnf, under [v3_ca] [ v3_ca ] subjectAltName = DNS:localhost # or local domain 3. Create local certs directory mkdir ~/certs 4. Create certificate openssl req -x509 -sha256 -nodes -newkey rsa:2048 -days 365 -config ~/openssl-temp.cnf -keyout ~/certs/domain-name.com.key -out ~/certs/domain-name.com.crt 5. Add trust to Keychain sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain ~/certs/domain-name.com.crt 6. Delete openSSL temp file rm -f ~/openssl-temp.cnf
