Node.js Tool Diagnoses Specific TLS Certificate Trust Errors

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A developer has created a diagnostic tool to differentiate between three common TLS certificate trust errors in Node.js applications. The common but vague 'certificate not trusted' error can stem from a self-signed certificate, an incomplete server certificate chain, or a chain ending in an untrusted root certificate. The tool, tested against deliberately flawed hosts on badssl.com, inspects the certificate chain directly after establishing a non-rejecting TLS connection. It analyzes the socket's authorization error code and the peer certificate's issuer chain to pinpoint the exact failure cause. This allows developers to apply the correct fix, such as obtaining a valid certificate or adjusting server configuration.

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