vercel-labs/portless

Replace port numbers with stable, named local URLs. For humans and agents.

TypeScript★ 11,880+73 that day#11 on trending

Analyzed September 3, 2026 at 1ad573b (main) with jscpd 5.4.0 in 0.1s.

2.24%duplicated code · 323 of 14,431 lines

28clones in code

39code files of 158 scanned

7.42%duplicated over all files · 228 clones

The code number leaves out tests, fixtures, docs, examples, data files, styles, translations and vendored code.

Largest clones in the code

27 lines in 2 placestypescript139 tokens

packages/portless/src/proxy.ts:335–361packages/portless/src/proxy.ts:448–473

335const forwardedHeaders = buildForwardedHeaders(req, reqTls);
336const proxyReqHeaders: http.OutgoingHttpHeaders = { ...req.headers };
337for (const [key, value] of Object.entries(forwardedHeaders)) {
338  proxyReqHeaders[key] = value;
339}
340proxyReqHeaders[PORTLESS_HOPS_HEADER] = String(hops + 1);
341// Remove HTTP/2 pseudo-headers before forwarding to HTTP/1.1 backend
342for (const key of Object.keys(proxyReqHeaders)) {
343  if (key.startsWith(":")) {
344    delete proxyReqHeaders[key];

First 10 of 27 lines.

20 lines in 2 placestypescript116 tokens

packages/portless/src/cli.ts:1754–1773packages/portless/src/cli.ts:1780–1799

1754while (i < args.length && args[i].startsWith("-")) {
1755  if (args[i] === "--") {
1756    i++;
1757    break;
1758  } else if (args[i] === "--force") {
1759    force = true;
1760  } else if (args[i] === "--app-port") {
1761    i++;
1762    appPort = parseAppPort(args[i]);
1763  } else if (applySharingFlag(args[i])) {

First 10 of 20 lines.

17 lines in 2 placestypescript104 tokens

packages/portless/src/routes.ts:174–190packages/portless/src/routes.ts:258–274

174loadRoutes(persistCleanup = false): RouteMapping[] {
175  if (!fs.existsSync(this.routesPath)) {
176    return [];
177  }
178  try {
179    const raw = fs.readFileSync(this.routesPath, "utf-8");
180    let parsed: unknown;
181    try {
182      parsed = JSON.parse(raw);
183    } catch {

First 10 of 17 lines.

7 more

16 lines in 2 placestypescript98 tokens
packages/portless/src/cli.ts:921–936 packages/portless/src/cli.ts:1016–1031
13 lines in 2 placestypescript92 tokens
packages/portless/src/cli.ts:173–185 packages/portless/src/service.ts:25–37
10 lines in 2 placestypescript87 tokens
packages/portless/src/cli.ts:3963–3972 packages/portless/src/cli.ts:4064–4073
12 lines in 2 placestypescript85 tokens
packages/portless/src/proxy.ts:448–459 packages/portless/src/proxy.ts:597–608
8 lines in 2 placestypescript80 tokens
packages/portless/src/cli.ts:3695–3702 packages/portless/src/cli.ts:3720–3728
15 lines in 2 placestypescript75 tokens
packages/portless/src/certs.ts:483–497 packages/portless/src/certs.ts:1043–1051
11 lines in 2 placesbash75 tokens
scripts/windows-debug/run.sh:61–71 scripts/windows-debug/run.sh:74–84

Largest clones over all files, tests and data included

7 lines in 6 placestypescripttests66 tokens

packages/portless/src/proxy.test.ts:1122–1128packages/portless/src/proxy.test.ts:1165–1173packages/portless/src/proxy.test.ts:1618–1626packages/portless/src/proxy.test.ts:1692–1700packages/portless/src/proxy.test.ts:1879–1887and 1 more

1122await listen(backend);
1123const backendAddr = backend.address();
1124if (!backendAddr || typeof backendAddr === "string") throw new Error("no addr");
1125
1126const routes: RouteInfo[] = [{ hostname: "ws.localhost", port: backendAddr.port }];
1127const server = trackServer(
1128  createProxyServer({ getRoutes: () => routes, proxyPort: TEST_PROXY_PORT })

1165await listen(backend);
1166const backendAddr = backend.address();
1167if (!backendAddr || typeof backendAddr === "string") throw new Error("no addr");
1168
1169const routes: RouteInfo[] = [{ hostname: "ws.localhost", port: backendAddr.port }];
1170const server = trackServer(
1171  createProxyServer({
1172    getRoutes: () => routes,
1173    proxyPort: TEST_PROXY_PORT,

53 lines in 2 placestypescripttests304 tokens

tests/e2e/src/parallel.test.ts:12–64tests/e2e/src/zombie.test.ts:12–64

12const PROXY_PORT = 19012;
13
14const isWindows = process.platform === "win32";
15
16function killPort(port: number): void {
17  try {
18    if (isWindows) {
19      const output = execSync("netstat -ano -p tcp", {
20        encoding: "utf-8",
21        timeout: 5000,

First 10 of 53 lines.

50 lines in 2 placestypescripttests294 tokens

tests/e2e/src/harness.ts:22–71tests/e2e/src/parallel.test.ts:14–62

22  : path.join(VENV_DIR, "bin", "python3");
23
24/** Kill any process listening on the given TCP port (skips our own PID). */
25function killPort(port: number): void {
26  try {
27    if (isWindows) {
28      const output = execSync("netstat -ano -p tcp", {
29        encoding: "utf-8",
30        timeout: 5000,
31      });

14const isWindows = process.platform === "win32";
15
16function killPort(port: number): void {
17  try {
18    if (isWindows) {
19      const output = execSync("netstat -ano -p tcp", {
20        encoding: "utf-8",
21        timeout: 5000,
22      });
23      const myPid = process.pid;

First 10 of 50 lines, the second copy on the right.

19 lines in 4 placestypescripttests98 tokens
packages/portless/src/cli.test.ts:1162–1180 packages/portless/src/cli.test.ts:1250–1268 packages/portless/src/cli.test.ts:1288–1307 packages/portless/src/cli.test.ts:1381–1397
10 lines in 4 placestypescripttests77 tokens
packages/portless/src/proxy.test.ts:146–155 packages/portless/src/proxy.test.ts:193–204 packages/portless/src/proxy.test.ts:1411–1422 packages/portless/src/proxy.test.ts:1480–1491

By format, code only

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	23	13,166	27	312	2.37%
bash	14	1,058	1	11	1.04%
perl	1	174	0	0	0%
javascript	1	33	0	0	0%

By format, all files

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	77	28,479	214	2,467	8.66%
markdown	6	1,973	6	68	3.45%
tsx	22	2,285	3	36	1.58%
bash	18	1,240	1	11	0.89%
json	16	505	1	25	4.95%
css	2	347	1	7	2.02%
yaml	4	278	1	14	5.04%
javascript	8	135	1	6	4.44%
perl	1	174	0	0	0%
text	1	38	0	0	0%

Trending appearances

Day	Rank	Stars	Files	Lines	Clones	All files	Code	Health	Commit
Sep 3, 2026	#11	11,880 (+73)	158	35,497	228	7.42%	2.24%	—	`1ad573b`

Want this for your own project? Install jscpd and run jscpd ., or measure it the way the baselines were measured.