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npm registry response produced invalid JSON Error: Invalid JSON / npm ERR! SyntaxError: Unexpected token < npm received invalid JSON where it expected package metadata, often because of a temporary registry issue, a corrupted local cache, an invalid package.json, or a corporate proxy returning HTML.
Observed message
Error: Invalid JSON / npm ERR! SyntaxError: Unexpected token < Why it happens
The npm registry or local cache returned corrupted metadata. A corporate proxy returned HTML instead of JSON. A package being installed has invalid package.json content. How to fix it
Run npm cache clean and retry later in case of a temporary registry issue. Check npm proxy configuration if a proxy may be rewriting registry responses. Inspect the package metadata or package.json involved in the failing install. 