diff --git a/LICENSE b/LICENSE
index b23e82a..49d9831 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2024 cross-org <https://github.com/cross-org>
+Copyright (c) 2024-2026 cross-org <https://github.com/cross-org>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index b2370f1..f99e67f 100644
--- a/README.md
+++ b/README.md
@@ -120,12 +120,10 @@ const { privateKey, publicKey } = await generateKeyPair("RS512");
 const key = await generateKeyPair({ algorithm: "RS512" });
 ```
 
-- **`exportPEMKey(key: CryptoKey, filePathOrOptions?: string | ExportPEMKeyOptions): Promise<string>`** (Experimental)
-- **`importPEMKey(keyDataOrPath: string, algorithm: SupportedKeyPairAlgorithms): Promise<CryptoKey>`** (Experimental)
+- **`exportPEMKey(key: CryptoKey, filePathOrOptions?: string | ExportPEMKeyOptions): Promise<string>`**
+- **`importPEMKey(keyDataOrPath: string, algorithm: SupportedKeyPairAlgorithms): Promise<CryptoKey>`**
 
 ```javascript
-// Experimental.
-
 // Generate and export RS512 keys in PEM-format. (filePath and write mode can be supplied as optional second parameter at export)
 const { privateKey, publicKey } = await generateKeyPair("RS512");
 await exportPEMKey(privateKey, "./private_key_RS512.pem");
@@ -431,13 +429,13 @@ const insecureString = "shortString";
 const key = await generateKey(insecureString, keyOptions);
 ```
 
-Export/import a key pair to and from local files. (Experimental)
+Export/import a key pair to and from local files.
 
 ```javascript
 // Generate and export RS512 keys in PEM-format.
 const { privateKey, publicKey } = await generateKeyPair("RS512");
-await exportPEMKey(privateKey, "./private_key_RS512a.pem");
-await exportPEMKey(publicKey, "./public_key_RS512a.pem");
+await exportPEMKey(privateKey, "./private_key_RS512.pem");
+await exportPEMKey(publicKey, "./public_key_RS512.pem");
 
 // Import RS512 keys from PEM-format.
 const importedPrivateKey = await importPEMKey("./private_key_RS512.pem", "RS512");
diff --git a/deno.jsonc b/deno.jsonc
index 11d458b..4226bd3 100644
--- a/deno.jsonc
+++ b/deno.jsonc
@@ -1,6 +1,6 @@
 {
     "name": "@cross/jwt",
-    "version": "0.6.0",
+    "version": "1.0.0",
     "exports": "./mod.ts",
 
     "tasks": {
diff --git a/src/core/validate.ts b/src/core/validate.ts
index 902dcff..df9832d 100644
--- a/src/core/validate.ts
+++ b/src/core/validate.ts
@@ -92,7 +92,12 @@ export async function validateJWT(
         }
     }
 
-    const payload = JSON.parse(textDecode(decodeBase64Url(jwtParts[1])));
+    let payload: JWTPayload;
+    try {
+        payload = JSON.parse(textDecode(decodeBase64Url(jwtParts[1])));
+    } catch (_error) {
+        throw new JWTParseError("Invalid JWT payload: malformed JSON");
+    }
 
     validateClaims(payload, options);
 
@@ -251,12 +256,8 @@ export function unsafeParseJWT(jwt: string): JWTPayload {
         const jwtParts = validateParts(jwt);
         const payload = JSON.parse(textDecode(decodeBase64Url(jwtParts[1])));
         return payload;
-    } catch (error) {
-        if (error instanceof Error) {
-            throw new JWTParseError(error.message);
-        } else {
-            throw new JWTParseError("An unknown error occurred while parsing the JWT.");
-        }
+    } catch (_error) {
+        throw new JWTParseError("Invalid JWT format or malformed payload");
     }
 }
 
@@ -272,11 +273,7 @@ export function unsafeParseJOSEHeader(jwt: string): JOSEHeader {
         const jwtParts = validateParts(jwt);
         const payload = JSON.parse(textDecode(decodeBase64Url(jwtParts[0])));
         return payload;
-    } catch (error) {
-        if (error instanceof Error) {
-            throw new JWTParseError(error.message);
-        } else {
-            throw new JWTParseError("An unknown error occurred while parsing the JOSE header.");
-        }
+    } catch (_error) {
+        throw new JWTParseError("Invalid JWT format or malformed header");
     }
 }
diff --git a/src/crypto/sign-verify/rsapss.ts b/src/crypto/sign-verify/rsapss.ts
index 29ae0da..ceec22c 100644
--- a/src/crypto/sign-verify/rsapss.ts
+++ b/src/crypto/sign-verify/rsapss.ts
@@ -12,9 +12,12 @@ import type { JWTOptions } from "../../types/options.ts";
  * @returns {Promise<string>} A promise resolving to the base64url-encoded RSA-PSS signature.
  */
 export async function signWithRSAPSS(key: CryptoKey, data: string, options?: JWTOptions) {
-    (key.algorithm as RsaPssParams).saltLength = options?.saltLength || 32;
+    const algorithm = {
+        name: key.algorithm.name,
+        saltLength: options?.saltLength || 32,
+    };
     const signature = await crypto.subtle.sign(
-        key.algorithm,
+        algorithm,
         key,
         textEncode(data) as BufferSource,
     );
@@ -32,9 +35,12 @@ export async function signWithRSAPSS(key: CryptoKey, data: string, options?: JWT
  * @returns {Promise<boolean>} A promise resolving to `true` if the signature is valid, `false` otherwise.
  */
 export async function verifyWithRSAPSS(key: CryptoKey, data: string, signature: string, options?: JWTOptions) {
-    (key.algorithm as RsaPssParams).saltLength = options?.saltLength || 32;
+    const algorithm = {
+        name: key.algorithm.name,
+        saltLength: options?.saltLength || 32,
+    };
     const isValid = await crypto.subtle.verify(
-        key.algorithm,
+        algorithm,
         key,
         decodeBase64Url(signature),
         textEncode(data) as BufferSource,