diff --git a/app/converters/json-yaml/page.tsx b/app/converters/json-yaml/page.tsx
index c4efed1..4a51283 100644
--- a/app/converters/json-yaml/page.tsx
+++ b/app/converters/json-yaml/page.tsx
@@ -1,7 +1,6 @@
 "use client";
 
 import { useCallback, useMemo, useState } from "react";
-import * as O from "fp-ts/lib/Option";
 import yaml from "js-yaml";
 
 import { toolGroups } from "@/config/tools";
@@ -45,7 +44,7 @@ export default function Page() {
     setForm(prev => ({
       ...prev,
       json: text,
-      yaml: O.isNone(parsed)
+      yaml: parsed.isErr()
         ? ""
         : yaml.dump(parsed.value, { indent: prev.indentation.length, quotingType: '"' }),
     }));
@@ -57,7 +56,7 @@ export default function Page() {
     setForm(prev => ({
       ...prev,
       yaml: text,
-      json: O.isNone(parsed) ? "" : JSON.stringify(parsed.value, null, prev.indentation),
+      json: parsed.isErr() ? "" : JSON.stringify(parsed.value, null, prev.indentation),
     }));
   }, []);
 
@@ -68,7 +67,7 @@ export default function Page() {
   const onIndentationChange: SelectProps["onValueChange"] = value => {
     const parsed = safeJsonParse(form.json);
 
-    const jsonYaml = O.isNone(parsed)
+    const jsonYaml = parsed.isErr()
       ? { json: "", yaml: "" }
       : {
           json: JSON.stringify(parsed.value, null, value),
diff --git a/app/encoders-decoders/jwt/page.tsx b/app/encoders-decoders/jwt/page.tsx
index ac09bd3..f28d7e8 100644
--- a/app/encoders-decoders/jwt/page.tsx
+++ b/app/encoders-decoders/jwt/page.tsx
@@ -1,7 +1,6 @@
 "use client";
 
 import { useCallback, useMemo, useState } from "react";
-import * as O from "fp-ts/lib/Option";
 
 import { toolGroups } from "@/config/tools";
 import { decode } from "@/lib/jwt";
@@ -21,8 +20,8 @@ export default function Page() {
   );
 
   const { header: h, payload: p } = decode(jwt);
-  const header = O.isNone(h) ? "" : JSON.stringify(h.value, null, 2);
-  const payload = O.isNone(p) ? "" : JSON.stringify(p.value, null, 2);
+  const header = h.isErr() ? "" : JSON.stringify(h.value, null, 2);
+  const payload = p.isErr() ? "" : JSON.stringify(p.value, null, 2);
 
   const clearJwt = useCallback(() => setJwt(""), []);
 
diff --git a/app/encoders-decoders/url/page.tsx b/app/encoders-decoders/url/page.tsx
index eac521a..7bb545e 100644
--- a/app/encoders-decoders/url/page.tsx
+++ b/app/encoders-decoders/url/page.tsx
@@ -1,8 +1,6 @@
 "use client";
 
 import { useCallback, useMemo, useState } from "react";
-import { constant } from "fp-ts/lib/function";
-import * as O from "fp-ts/lib/Option";
 
 import { toolGroups } from "@/config/tools";
 import { safeDecodeURIComponent, safeEncodeURIComponent } from "@/lib/uri";
@@ -24,14 +22,14 @@ export default function Page() {
   const setDecodedReactively = useCallback((text: string) => {
     setForm({
       decoded: text,
-      encoded: O.getOrElse(constant(""))(safeEncodeURIComponent(text)),
+      encoded: safeEncodeURIComponent(text).unwrapOr(""),
     });
   }, []);
 
   const setEncodedReactively = useCallback((text: string) => {
     setForm({
       encoded: text,
-      decoded: O.getOrElse(constant(""))(safeDecodeURIComponent(text)),
+      decoded: safeDecodeURIComponent(text).unwrapOr(""),
     });
   }, []);
 
diff --git a/app/formatters/json/page.tsx b/app/formatters/json/page.tsx
index db19e72..8467728 100644
--- a/app/formatters/json/page.tsx
+++ b/app/formatters/json/page.tsx
@@ -1,7 +1,6 @@
 "use client";
 
 import { useCallback, useMemo, useState } from "react";
-import * as O from "fp-ts/lib/Option";
 
 import { toolGroups } from "@/config/tools";
 import { safeJsonParse } from "@/lib/json";
@@ -36,7 +35,7 @@ export default function Page() {
   const [input, setInput] = useState('{\n"foo":"bar"\n}');
 
   const parsed = safeJsonParse(input);
-  const output = O.isNone(parsed) ? "" : JSON.stringify(parsed.value, null, indentation);
+  const output = parsed.isErr() ? "" : JSON.stringify(parsed.value, null, indentation);
 
   const clearInput = useCallback(() => setInput(""), []);
 
diff --git a/lib/json.ts b/lib/json.ts
index 5499fce..9a8ecf5 100644
--- a/lib/json.ts
+++ b/lib/json.ts
@@ -1,3 +1,3 @@
-import { tryCatchK } from "fp-ts/lib/Option";
+import { fromThrowable } from "neverthrow";
 
-export const safeJsonParse = tryCatchK(JSON.parse);
+export const safeJsonParse = fromThrowable(JSON.parse);
diff --git a/lib/jwt.ts b/lib/jwt.ts
index afe9e3f..c1efee5 100644
--- a/lib/jwt.ts
+++ b/lib/jwt.ts
@@ -1,11 +1,11 @@
-import * as O from "fp-ts/lib/Option";
 import jwt_decode from "jwt-decode";
+import { err, fromThrowable, Result } from "neverthrow";
 
-const safeJwtDecode = O.tryCatchK(jwt_decode);
+const safeJwtDecode = fromThrowable(jwt_decode);
 
 export const decode = (token: string) => {
-  let header: O.Option<Record<string, unknown>> = O.none;
-  let payload: O.Option<unknown> = O.none;
+  let header: Result<unknown, unknown> = err("");
+  let payload: Result<unknown, unknown> = err("");
 
   if (token.split(".").length === 3) {
     header = safeJwtDecode(token, { header: true });
diff --git a/lib/uri.ts b/lib/uri.ts
index c02d85b..0e81ab4 100644
--- a/lib/uri.ts
+++ b/lib/uri.ts
@@ -1,4 +1,4 @@
-import { tryCatchK } from "fp-ts/lib/Option";
+import { fromThrowable } from "neverthrow";
 
-export const safeEncodeURIComponent = tryCatchK(encodeURIComponent);
-export const safeDecodeURIComponent = tryCatchK(decodeURIComponent);
+export const safeEncodeURIComponent = fromThrowable(encodeURIComponent);
+export const safeDecodeURIComponent = fromThrowable(decodeURIComponent);
diff --git a/lib/yaml.ts b/lib/yaml.ts
index 40315db..c8b0fb2 100644
--- a/lib/yaml.ts
+++ b/lib/yaml.ts
@@ -1,4 +1,4 @@
-import { tryCatchK } from "fp-ts/lib/Option";
 import yaml from "js-yaml";
+import { fromThrowable } from "neverthrow";
 
-export const safeYamlParse = tryCatchK(yaml.load);
+export const safeYamlParse = fromThrowable(yaml.load);
diff --git a/package.json b/package.json
index ecb7da6..77e7641 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,7 @@
     "js-yaml": "^4.1.0",
     "jwt-decode": "^3.1.2",
     "lucide-react": "^0.221.0",
+    "neverthrow": "^6.0.0",
     "next": "13.4.4",
     "next-themes": "^0.2.1",
     "react": "18.2.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 9b4891c..d976acc 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -61,6 +61,9 @@ dependencies:
   lucide-react:
     specifier: ^0.221.0
     version: 0.221.0(react@18.2.0)
+  neverthrow:
+    specifier: ^6.0.0
+    version: 6.0.0
   next:
     specifier: 13.4.4
     version: 13.4.4(@babel/core@7.22.1)(react-dom@18.2.0)(react@18.2.0)
@@ -3476,6 +3479,10 @@ packages:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
     dev: true
 
+  /neverthrow@6.0.0:
+    resolution: {integrity: sha512-kPZKRs4VkdloCGQXPoP84q4sT/1Z+lYM61AXyV8wWa2hnuo5KpPBF2S3crSFnMrOgUISmEBP8Vo/ngGZX60NhA==}
+    dev: false
+
   /next-themes@0.2.1(next@13.4.4)(react-dom@18.2.0)(react@18.2.0):
     resolution: {integrity: sha512-B+AKNfYNIzh0vqQQKqQItTS8evEouKD7H5Hj3kmuPERwddR2TxvDSFZuTj6T7Jfn1oyeUyJMydPl1Bkxkh0W7A==}
     peerDependencies: