SSL Certificate Checker API

Check a domain’s SSL certificate for validity, issuer, subject, alternative names, expiration dates, and days remaining. Use it in website audits, uptime monitors, security dashboards, and domain operations tooling.

Endpoint

POST /v1/utility/ssl/check

Request body

Field	Type	Required	Description
`domain`	`string`	Yes	Domain to check.
`port`	`number`	No	Port to check. Defaults to `443`.

Example request

curl --request POST \
  --url https://apimask-email-domain-validation-api.p.rapidapi.com/v1/utility/ssl/check \
  --header "Content-Type: application/json" \
  --header "X-RapidAPI-Key: $RAPIDAPI_KEY" \
  --header "X-RapidAPI-Host: apimask-email-domain-validation-api.p.rapidapi.com" \
  --data '{"domain":"example.com","port":443}'

Example response

{
  "success": true,
  "data": {
    "is_valid": true,
    "subject": {},
    "issuer": {},
    "version": 3,
    "serial_number": "12345",
    "not_before": "2026-01-01T00:00:00Z",
    "not_after": "2026-12-31T23:59:59Z",
    "days_remaining": 195,
    "sans": ["example.com"],
    "error": null
  },
  "error": null,
  "meta": {}
}

URL Parser DNS Analyzer