The HTTP 405 Method Not Allowed error in npm occurs when the registry or proxy rejects the HTTP method used by npm. This typically indicates a misconfigured proxy, registry, or permission issue.
HTTP 405 means the server understood the request but refuses to fulfill it because the HTTP method (GET, POST, PUT, DELETE) is not allowed for the requested resource. In npm's context, this usually happens during publish (PUT), unpublish (DELETE), or when a proxy incorrectly restricts certain methods. This is different from 401 (not authenticated) or 403 (forbidden) - with 405, your credentials may be fine, but the action itself is blocked at the protocol level.
Check what npm is trying to do:
# Run with verbose logging
npm publish --verboseLook for the HTTP method being rejected (PUT for publish, DELETE for unpublish).
Bypass proxy to isolate the issue:
# Temporarily remove proxy
npm config delete proxy
npm config delete https-proxy
# Try operation again
npm publishIf it works, proxy is the issue.
Work with IT to allow PUT/DELETE through proxy:
1. Request PUT method be allowed for registry.npmjs.org
2. Or for *.npmjs.org if using scoped packages
3. Provide business justification for publishing packages
For publishing, temporarily use unrestricted network:
# Connect to mobile hotspot or
# Use VPN that doesn't restrict methods
npm publishIf using private registry:
# Verify registry URL
npm config get registry
# Check if it's a read-only mirror
# Contact registry admin about write permissionsFor organizations, consider:
# Internal npm registry that allows all methods
npm config set registry https://npm.internal.company.com
# Or use Verdaccio/Nexus with proper permissionsEnterprise proxies often restrict HTTP methods for security. Work with security team to create exceptions for npm registry traffic. Consider using a private npm registry inside the corporate network that can publish to public npm without proxy restrictions. In CI/CD, use dedicated runners that have unrestricted access for publishing workflows.
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