How to Fix npm SSL Certificate Errors on macOS: The Complete Troubleshooting Guide

How to Fix npm SSL Certificate Errors on macOS: A Complete Troubleshooting Guide The core question this article answers: Why does npm install throw UNABLE_TO_GET_ISSUER_CERT_LOCALLY or curl: (77) error setting certificate verify locations on macOS — and how do you fix it for good? The short answer: the root cause is a missing /etc/ssl/cert.pem file on your system. Regenerating it and wiring up NODE_EXTRA_CA_CERTS for Node.js resolves the issue end-to-end. This guide walks through the full diagnostic chain — from the first error message to a fully working runtime. The Setup: One Package Install, Five Layers of Failure What started …