SSL Certificate Checker

Issuer, expiry, chain of trust, and SAN coverage.

Parameter	Type	Required	Description
`domain`	string	Yes	Domain to check (connects on port 443).

Example request

curl "https://netsh.io/api/v1/ssl-checker?domain=example.com&api_key=YOUR_API_KEY"

Example response

{
  "ok": true,
  "data": {
    "domain": "example.com",
    "status": "valid",
    "commonName": "example.com",
    "subjectAlternativeNames": ["example.com", "www.example.com"],
    "issuer": "WE1",
    "validFrom": "2026-09-05T22:29:39.000Z",
    "expiryDate": "2026-12-04T23:29:33.000Z",
    "daysRemaining": 86,
    "signatureAlgorithm": "ecdsa-with-SHA256",
    "chain": [
      { "commonName": "example.com", "issuer": "WE1", "validFrom": "2026-09-05T22:29:39.000Z", "validTo": "2026-12-04T23:29:33.000Z" },
      { "commonName": "WE1", "issuer": "GTS Root R4", "validFrom": "2023-12-13T09:00:00.000Z", "validTo": "2029-02-20T14:00:00.000Z" }
    ]
  },
  "meta": { "tool": "ssl-checker", "version": "v1" }
}

Port Checker