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Node.js error

ERR_TLS_CERT_ALTNAME_FORMAT

This error is thrown by checkServerIdentity if a user-supplied subjectaltname property violates encoding rules. Certificate objects produced by Node.js itself always comply with encoding rules and will never cause this error.

Reference entryNode.jsFetched
This is a reference entry from Node.js documentation. A full explanation with fixes has not been written yet.

The error message

Node.js documentation lists the code ERR_TLS_CERT_ALTNAME_FORMAT without the printed message text.

Details

Category
Node.js error codes
Severity
error
Runtime
node

Related errors

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Source: Node.js documentation. Data fetched 2026-09-25T01:43:12.380Z.