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fix: give the JWT decoder switch real tab semantics and name its fields #207

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Merged
anurag629 merged 2 commits into from
Oct 20, 2026
Merged

fix: give the JWT decoder switch real tab semantics and name its fields #207

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8313d61
fix: give the JWT decoder switch real tab semantics and name its fields
varun-pahuja Oct 17, 2026
204850b
fix: point the verification toggle at the element it expands
varun-pahuja Oct 19, 2026
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86 changes: 78 additions & 8 deletions app/(tools)/jwt-decoder/JwtDecoderClient.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,12 @@ import { cn } from "@/lib/cn";

type TabId = "decode" | "encode";

const TAB_IDS: TabId[] = ["decode", "encode"];

export function JwtDecoderClient() {
const [tab, setTab] = useState<TabId>("decode");
const tablistRef = useRef<HTMLDivElement>(null);

const [token, setToken] = useState("");
const [error, setError] = useState<string | null>(null);
const [decoded, setDecoded] = useState<DecodedJwt | null>(null);
Expand Down Expand Up @@ -97,6 +101,18 @@ export function JwtDecoderClient() {
push("Could not copy link", "error");
}
}, [token, push]);
function onTabKeyDown(e: React.KeyboardEvent, index: number) {
let next = index;
if (e.key === "ArrowRight") next = (index + 1) % TAB_IDS.length;
else if (e.key === "ArrowLeft") next = (index - 1 + TAB_IDS.length) % TAB_IDS.length;
else if (e.key === "Home") next = 0;
else if (e.key === "End") next = TAB_IDS.length - 1;
else return;
e.preventDefault();
setTab(TAB_IDS[next]!);
const btns = tablistRef.current?.querySelectorAll<HTMLButtonElement>('[role="tab"]');
btns?.[next]?.focus();
}

const downloadJson = useCallback(() => {
if (!decoded) return;
Expand Down Expand Up @@ -141,12 +157,29 @@ export function JwtDecoderClient() {
return (
<>
<section className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-5">
<div className="inline-flex p-1 rounded-lg border border-[var(--hairline)] bg-[var(--bg-card)]">
<TabButton active={tab === "decode"} onClick={() => setTab("decode")}>
<div
ref={tablistRef}
role="tablist"
aria-label="JWT decoder mode"
className="inline-flex p-1 rounded-lg border border-[var(--hairline)] bg-[var(--bg-card)]"
>
<TabButton
id="jwt-tab-decode"
ariaControls="jwt-panel-decode"
active={tab === "decode"}
onClick={() => setTab("decode")}
onKeyDown={(e) => onTabKeyDown(e, 0)}
>
<Lock className="w-3.5 h-3.5" />
Decode
</TabButton>
<TabButton active={tab === "encode"} onClick={() => setTab("encode")}>
<TabButton
id="jwt-tab-encode"
ariaControls="jwt-panel-encode"
active={tab === "encode"}
onClick={() => setTab("encode")}
onKeyDown={(e) => onTabKeyDown(e, 1)}
>
<KeyRound className="w-3.5 h-3.5" />
Encode
</TabButton>
Expand All @@ -155,7 +188,12 @@ export function JwtDecoderClient() {

{tab === "decode" && (
<>
<section className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-5">
<section
role="tabpanel"
id="jwt-panel-decode"
aria-labelledby="jwt-tab-decode"
className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-5"
>
<div className="card overflow-hidden">
<div className="flex flex-wrap items-center justify-between gap-2 px-4 py-2.5 border-b border-[var(--hairline)] bg-[var(--bg-raise)]">
<span className="font-mono text-[10.5px] tracking-[0.22em] uppercase text-[var(--fg-dim)] flex items-center gap-2">
Expand Down Expand Up @@ -215,6 +253,7 @@ export function JwtDecoderClient() {
</pre>
<textarea
ref={inputRef}
aria-label="Encoded JWT"
value={token}
onChange={(e) => setToken(e.target.value.replace(/\s/g, ""))}
spellCheck={false}
Expand Down Expand Up @@ -250,8 +289,14 @@ export function JwtDecoderClient() {
</div>
<div className="p-3 flex flex-col gap-2">
<div className="flex items-center gap-2">
<label className="font-mono text-[11px] text-[var(--fg-dim)] shrink-0">Endpoint</label>
<label
htmlFor="jwt-curl-endpoint"
className="font-mono text-[11px] text-[var(--fg-dim)] shrink-0"
>
Endpoint
</label>
<input
id="jwt-curl-endpoint"
value={curlEndpoint}
onChange={(e) => setCurlEndpoint(e.target.value)}
className="flex-1 px-3 py-1.5 rounded-md border border-[var(--hairline)] bg-[var(--bg-soft)] text-[var(--fg)] font-mono text-[12.5px]"
Expand Down Expand Up @@ -283,7 +328,10 @@ export function JwtDecoderClient() {

{error && (
<section className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-5">
<div className="rounded-lg border border-[rgba(255,77,109,0.3)] bg-[rgba(255,77,109,0.06)] px-4 py-3 flex items-start gap-3 animate-fade-in">
<div
role="alert"
className="rounded-lg border border-[rgba(255,77,109,0.3)] bg-[rgba(255,77,109,0.06)] px-4 py-3 flex items-start gap-3 animate-fade-in"
>
<AlertCircle className="w-4 h-4 text-[var(--rose)] mt-0.5" />
<div>
<span className="font-mono text-[11px] tracking-[0.22em] uppercase text-[var(--rose)]">
Expand Down Expand Up @@ -365,7 +413,12 @@ export function JwtDecoderClient() {
)}

{tab === "encode" && (
<section className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-10">
<section
role="tabpanel"
id="jwt-panel-encode"
aria-labelledby="jwt-tab-encode"
className="mx-auto max-w-7xl w-full px-4 sm:px-6 pb-10"
>
<EncoderTab />
</section>
)}
Expand All @@ -382,18 +435,30 @@ function redact(token: string): string {
}

function TabButton({
id,
ariaControls,
active,
children,
onClick,
onKeyDown,
}: {
id: string;
ariaControls: string;
active: boolean;
children: React.ReactNode;
onClick: () => void;
onKeyDown: (e: React.KeyboardEvent) => void;
}) {
return (
<button
type="button"
id={id}
role="tab"
aria-selected={active}
aria-controls={ariaControls}
tabIndex={active ? 0 : -1}
onClick={onClick}
onKeyDown={onKeyDown}
className={cn(
"inline-flex items-center gap-2 px-4 py-2 rounded-md text-[13px] font-mono transition-all",
active
Expand Down Expand Up @@ -447,13 +512,18 @@ function SignatureCard({
</div>
<button
onClick={onToggle}
aria-expanded={open}
aria-controls="jwt-verification-explained"
className="mt-2 flex items-center gap-1 font-mono text-[11px] tracking-[0.2em] uppercase text-[var(--fg-dim)] hover:text-[var(--fg)]"
>
<ChevronDown className={cn("w-3 h-3 transition-transform", open && "rotate-180")} />
How verification works
</button>
{open && (
<div className="mt-3 text-[12.5px] text-[var(--fg-muted)] leading-relaxed space-y-2 animate-fade-in">
<div
id="jwt-verification-explained"
className="mt-3 text-[12.5px] text-[var(--fg-muted)] leading-relaxed space-y-2 animate-fade-in"
>
<p>Verification proves the token was signed by a party who knows the secret (or private key):</p>
<ol className="list-decimal pl-5 space-y-1">
<li>Split the token into <span className="font-mono text-[var(--fg)]">header.payload.signature</span>.</li>
Expand Down
3 changes: 3 additions & 0 deletions app/(tools)/jwt-decoder/components/EncoderTab.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,7 @@ export function EncoderTab() {
</div>
</div>
<textarea
aria-label="JWT payload"
value={payload}
onChange={(e) => setPayload(e.target.value)}
spellCheck={false}
Expand All @@ -159,6 +160,7 @@ export function EncoderTab() {
</div>
{isHmac ? (
<input
aria-label="HMAC secret"
value={keyMaterial}
onChange={(e) => setKeyMaterial(e.target.value)}
spellCheck={false}
Expand All @@ -167,6 +169,7 @@ export function EncoderTab() {
/>
) : (
<textarea
aria-label="Private key or JWK"
value={keyMaterial}
onChange={(e) => setKeyMaterial(e.target.value)}
spellCheck={false}
Expand Down
3 changes: 3 additions & 0 deletions app/(tools)/jwt-decoder/components/VerifyPanel.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,7 @@ export function VerifyPanel({ token, alg }: VerifyPanelProps) {
{isHmac ? (
<input
type="text"
aria-label="Shared HMAC secret"
value={secret}
onChange={(e) => setSecret(e.target.value)}
spellCheck={false}
Expand All @@ -144,6 +145,7 @@ export function VerifyPanel({ token, alg }: VerifyPanelProps) {
/>
) : (
<textarea
aria-label="Public key or JWK to verify"
value={secret}
onChange={(e) => setSecret(e.target.value)}
spellCheck={false}
Expand All @@ -165,6 +167,7 @@ export function VerifyPanel({ token, alg }: VerifyPanelProps) {
<div className="flex gap-2">
<input
type="url"
aria-label="JWKS URL"
value={jwksUrl}
onChange={(e) => setJwksUrl(e.target.value)}
placeholder="https://your-auth-provider/.well-known/jwks.json"
Expand Down
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