SSL Certificate Info API — Get Detailed SSL/TLS Certificate Information
Get detailed SSL/TLS certificate information including SANs, issuer details, key usage, and certificate chain. Free API.
What is SSL Certificate Info?
SSL certificate info provides detailed information about a domain's SSL/TLS certificate including Subject Alternative Names (SANs), certificate authority details, key algorithm and size, key usage extensions, and the full certificate chain with each certificate's details.
How to Use It
Call GET /api/v1/ssl-cert-info?host=google.com. Returns { host: string, certificate: object, chain: object[], sans: string[], algorithm: string, key_size: number, days_remaining: number }.
Try it live
Test this endpoint in the interactive console
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Frequently Asked Questions
What is a Subject Alternative Name (SAN)?
SANs list all domains and subdomains covered by the certificate. A single certificate can secure multiple domains.