diff --git a/src/types.ts b/src/types.ts
index e49b86b..cf6fec6 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -29,4 +29,12 @@ export interface GenerateCertOptions {
   commonName?: string
 }
 
+export type CertDetails = {
+  subject: any
+  issuer: any
+  validFrom: Date
+  validTo: Date
+  serialNumber: string
+}
+
 export type TlsConfig = DeepPartial<TlsOptions>
diff --git a/src/utils.ts b/src/utils.ts
index 0492ada..c0faed7 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,6 +2,7 @@ import fs from 'node:fs'
 import os from 'node:os'
 import path from 'node:path'
 import { pki } from 'node-forge'
+import type { CertDetails } from './types'
 
 /**
  * Checks if a certificate is valid for a given domain.
@@ -33,14 +34,6 @@ export function readCertFromFile(certPath: string): string {
   return fs.readFileSync(certPath, 'utf8')
 }
 
-export type CertDetails = {
-  subject: any
-  issuer: any
-  validFrom: Date
-  validTo: Date
-  serialNumber: string
-}
-
 /**
  * Parses and extracts details from a certificate.
  * @param certPemOrPath - The certificate in PEM format or the path to the certificate file.