1 files changed, 7 insertions, 10 deletions
diff --git a/std/node/_fs/_fs_common.ts b/std/node/_fs/_fs_common.ts
index 43d3b8064..3c20ca73e 100644
--- a/std/node/_fs/_fs_common.ts
+++ b/std/node/_fs/_fs_common.ts
@@ -61,7 +61,11 @@ export function getEncoding(
 
 export function checkEncoding(encoding: Encodings | null): Encodings | null {
   if (!encoding) return null;
-  if (encoding === "utf8" || encoding === "utf-8") {
+
+  encoding = encoding.toLowerCase() as Encodings;
+  if (["utf8", "hex", "base64"].includes(encoding)) return encoding;
+
+  if (encoding === "utf-8") {
     return "utf8";
   }
   if (encoding === "binary") {
@@ -70,16 +74,9 @@ export function checkEncoding(encoding: Encodings | null): Encodings | null {
     // node -e "require('fs').readFile('../world.txt', 'buffer', console.log)"
   }
 
-  const notImplementedEncodings = [
-    "utf16le",
-    "latin1",
-    "base64",
-    "hex",
-    "ascii",
-    "ucs2",
-  ];
+  const notImplementedEncodings = ["utf16le", "latin1", "ascii", "ucs2"];
 
-  if (notImplementedEncodings.includes(encoding)) {
+  if (notImplementedEncodings.includes(encoding as string)) {
     notImplemented(`"${encoding}" encoding`);
   }