diff --git a/api/gist.js b/api/gist.js
index 7c5f9e68..d6713eaf 100644
--- a/api/gist.js
+++ b/api/gist.js
@@ -1,10 +1,11 @@
 // @ts-check
 
-import { CONSTANTS, renderError, parseBoolean } from "../src/common/utils.js";
+import { renderError, parseBoolean } from "../src/common/utils.js";
 import { isLocaleAvailable } from "../src/translations.js";
 import { renderGistCard } from "../src/cards/gist.js";
 import { fetchGist } from "../src/fetchers/gist.js";
 import {
+  CACHE_TTL,
   resolveCacheSeconds,
   setCacheHeaders,
   setErrorCacheHeaders,
@@ -65,9 +66,9 @@ export default async (req, res) => {
     const gistData = await fetchGist(id);
     const cacheSeconds = resolveCacheSeconds({
       requested: parseInt(cache_seconds, 10),
-      def: CONSTANTS.TWO_DAY,
-      min: CONSTANTS.TWO_DAY,
-      max: CONSTANTS.SIX_DAY,
+      def: CACHE_TTL.GIST_CARD.DEFAULT,
+      min: CACHE_TTL.GIST_CARD.MIN,
+      max: CACHE_TTL.GIST_CARD.MAX,
     });
 
     setCacheHeaders(res, cacheSeconds);
diff --git a/api/index.js b/api/index.js
index 37a29841..d5e55fbb 100644
--- a/api/index.js
+++ b/api/index.js
@@ -3,16 +3,12 @@
 import { renderStatsCard } from "../src/cards/stats.js";
 import { guardAccess } from "../src/common/access.js";
 import {
+  CACHE_TTL,
   resolveCacheSeconds,
   setCacheHeaders,
   setErrorCacheHeaders,
 } from "../src/common/cache.js";
-import {
-  CONSTANTS,
-  parseArray,
-  parseBoolean,
-  renderError,
-} from "../src/common/utils.js";
+import { parseArray, parseBoolean, renderError } from "../src/common/utils.js";
 import { fetchStats } from "../src/fetchers/stats.js";
 import { isLocaleAvailable } from "../src/translations.js";
 
@@ -94,9 +90,9 @@ export default async (req, res) => {
     );
     const cacheSeconds = resolveCacheSeconds({
       requested: parseInt(cache_seconds, 10),
-      def: CONSTANTS.CARD_CACHE_SECONDS,
-      min: CONSTANTS.TWELVE_HOURS,
-      max: CONSTANTS.TWO_DAY,
+      def: CACHE_TTL.STATS_CARD.DEFAULT,
+      min: CACHE_TTL.STATS_CARD.MIN,
+      max: CACHE_TTL.STATS_CARD.MAX,
     });
 
     setCacheHeaders(res, cacheSeconds);
diff --git a/api/pin.js b/api/pin.js
index 2183c8f1..e1f46b32 100644
--- a/api/pin.js
+++ b/api/pin.js
@@ -3,11 +3,12 @@
 import { renderRepoCard } from "../src/cards/repo.js";
 import { guardAccess } from "../src/common/access.js";
 import {
+  CACHE_TTL,
   resolveCacheSeconds,
   setCacheHeaders,
   setErrorCacheHeaders,
 } from "../src/common/cache.js";
-import { CONSTANTS, parseBoolean, renderError } from "../src/common/utils.js";
+import { parseBoolean, renderError } from "../src/common/utils.js";
 import { fetchRepo } from "../src/fetchers/repo.js";
 import { isLocaleAvailable } from "../src/translations.js";
 
@@ -67,9 +68,9 @@ export default async (req, res) => {
     const repoData = await fetchRepo(username, repo);
     const cacheSeconds = resolveCacheSeconds({
       requested: parseInt(cache_seconds, 10),
-      def: CONSTANTS.PIN_CARD_CACHE_SECONDS,
-      min: CONSTANTS.ONE_DAY,
-      max: CONSTANTS.TEN_DAY,
+      def: CACHE_TTL.PIN_CARD.DEFAULT,
+      min: CACHE_TTL.PIN_CARD.MIN,
+      max: CACHE_TTL.PIN_CARD.MAX,
     });
 
     setCacheHeaders(res, cacheSeconds);
diff --git a/api/top-langs.js b/api/top-langs.js
index 3e903428..df286b48 100644
--- a/api/top-langs.js
+++ b/api/top-langs.js
@@ -3,16 +3,12 @@
 import { renderTopLanguages } from "../src/cards/top-languages.js";
 import { guardAccess } from "../src/common/access.js";
 import {
+  CACHE_TTL,
   resolveCacheSeconds,
   setCacheHeaders,
   setErrorCacheHeaders,
 } from "../src/common/cache.js";
-import {
-  CONSTANTS,
-  parseArray,
-  parseBoolean,
-  renderError,
-} from "../src/common/utils.js";
+import { parseArray, parseBoolean, renderError } from "../src/common/utils.js";
 import { fetchTopLanguages } from "../src/fetchers/top-languages.js";
 import { isLocaleAvailable } from "../src/translations.js";
 
@@ -124,9 +120,9 @@ export default async (req, res) => {
     );
     const cacheSeconds = resolveCacheSeconds({
       requested: parseInt(cache_seconds, 10),
-      def: CONSTANTS.TOP_LANGS_CACHE_SECONDS,
-      min: CONSTANTS.TWO_DAY,
-      max: CONSTANTS.TEN_DAY,
+      def: CACHE_TTL.TOP_LANGS_CARD.DEFAULT,
+      min: CACHE_TTL.TOP_LANGS_CARD.MIN,
+      max: CACHE_TTL.TOP_LANGS_CARD.MAX,
     });
 
     setCacheHeaders(res, cacheSeconds);
diff --git a/api/wakatime.js b/api/wakatime.js
index 7b5571eb..b8642649 100644
--- a/api/wakatime.js
+++ b/api/wakatime.js
@@ -1,15 +1,11 @@
 // @ts-check
 
 import { renderWakatimeCard } from "../src/cards/wakatime.js";
-import {
-  CONSTANTS,
-  parseArray,
-  parseBoolean,
-  renderError,
-} from "../src/common/utils.js";
+import { parseArray, parseBoolean, renderError } from "../src/common/utils.js";
 import { fetchWakatimeStats } from "../src/fetchers/wakatime.js";
 import { isLocaleAvailable } from "../src/translations.js";
 import {
+  CACHE_TTL,
   resolveCacheSeconds,
   setCacheHeaders,
   setErrorCacheHeaders,
@@ -80,9 +76,9 @@ export default async (req, res) => {
     const stats = await fetchWakatimeStats({ username, api_domain });
     const cacheSeconds = resolveCacheSeconds({
       requested: parseInt(cache_seconds, 10),
-      def: CONSTANTS.CARD_CACHE_SECONDS,
-      min: CONSTANTS.SIX_HOURS,
-      max: CONSTANTS.TWO_DAY,
+      def: CACHE_TTL.WAKATIME_CARD.DEFAULT,
+      min: CACHE_TTL.WAKATIME_CARD.MIN,
+      max: CACHE_TTL.WAKATIME_CARD.MAX,
     });
 
     setCacheHeaders(res, cacheSeconds);
diff --git a/src/common/cache.js b/src/common/cache.js
index 32aa48ce..3e88e3c9 100644
--- a/src/common/cache.js
+++ b/src/common/cache.js
@@ -1,6 +1,64 @@
 // @ts-check
 
-import { clampValue, CONSTANTS } from "./utils.js";
+import { clampValue } from "./utils.js";
+
+const MIN = 60;
+const HOUR = 60 * MIN;
+const DAY = 24 * HOUR;
+
+/**
+ * Common durations in seconds.
+ */
+const DURATIONS = {
+  ONE_MINUTE: MIN,
+  FIVE_MINUTES: 5 * MIN,
+  TEN_MINUTES: 10 * MIN,
+  FIFTEEN_MINUTES: 15 * MIN,
+  THIRTY_MINUTES: 30 * MIN,
+
+  TWO_HOURS: 2 * HOUR,
+  FOUR_HOURS: 4 * HOUR,
+  SIX_HOURS: 6 * HOUR,
+  EIGHT_HOURS: 8 * HOUR,
+  TWELVE_HOURS: 12 * HOUR,
+
+  ONE_DAY: DAY,
+  TWO_DAY: 2 * DAY,
+  SIX_DAY: 6 * DAY,
+  TEN_DAY: 10 * DAY,
+};
+
+/**
+ * Common cache TTL values in seconds.
+ */
+const CACHE_TTL = {
+  STATS_CARD: {
+    DEFAULT: DURATIONS.ONE_DAY,
+    MIN: DURATIONS.TWELVE_HOURS,
+    MAX: DURATIONS.TWO_DAY,
+  },
+  TOP_LANGS_CARD: {
+    DEFAULT: DURATIONS.SIX_DAY,
+    MIN: DURATIONS.TWO_DAY,
+    MAX: DURATIONS.TEN_DAY,
+  },
+  PIN_CARD: {
+    DEFAULT: DURATIONS.TEN_DAY,
+    MIN: DURATIONS.ONE_DAY,
+    MAX: DURATIONS.TEN_DAY,
+  },
+  GIST_CARD: {
+    DEFAULT: DURATIONS.TWO_DAY,
+    MIN: DURATIONS.ONE_DAY,
+    MAX: DURATIONS.TEN_DAY,
+  },
+  WAKATIME_CARD: {
+    DEFAULT: DURATIONS.ONE_DAY,
+    MIN: DURATIONS.TWELVE_HOURS,
+    MAX: DURATIONS.TWO_DAY,
+  },
+  ERROR: DURATIONS.TEN_MINUTES,
+};
 
 /**
  * Resolves the cache seconds based on the requested, default, min, and max values.
@@ -56,7 +114,7 @@ const setCacheHeaders = (res, cacheSeconds) => {
     "Cache-Control",
     `max-age=${cacheSeconds}, ` +
       `s-maxage=${cacheSeconds}, ` +
-      `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+      `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
   );
 };
 
@@ -80,10 +138,16 @@ const setErrorCacheHeaders = (res) => {
   // Use lower cache period for errors.
   res.setHeader(
     "Cache-Control",
-    `max-age=${CONSTANTS.ERROR_CACHE_SECONDS}, ` +
-      `s-maxage=${CONSTANTS.ERROR_CACHE_SECONDS}, ` +
-      `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+    `max-age=${CACHE_TTL.ERROR}, ` +
+      `s-maxage=${CACHE_TTL.ERROR}, ` +
+      `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
   );
 };
 
-export { resolveCacheSeconds, setCacheHeaders, setErrorCacheHeaders };
+export {
+  resolveCacheSeconds,
+  setCacheHeaders,
+  setErrorCacheHeaders,
+  DURATIONS,
+  CACHE_TTL,
+};
diff --git a/src/common/index.js b/src/common/index.js
index 2e7e9cb2..39bbd6d6 100644
--- a/src/common/index.js
+++ b/src/common/index.js
@@ -1,3 +1,5 @@
+// @ts-check
+
 export { blacklist } from "./blacklist.js";
 export { Card } from "./Card.js";
 export { createProgressNode } from "./createProgressNode.js";
@@ -20,7 +22,6 @@ export {
   getCardColors,
   wrapTextMultiline,
   logger,
-  CONSTANTS,
   CustomError,
   MissingParamError,
   measureText,
diff --git a/src/common/utils.js b/src/common/utils.js
index 3dac650b..8b2fe01d 100644
--- a/src/common/utils.js
+++ b/src/common/utils.js
@@ -452,34 +452,6 @@ const noop = () => {};
 const logger =
   process.env.NODE_ENV === "test" ? { log: noop, error: noop } : console;
 
-const MIN = 60;
-const HOUR = 60 * MIN;
-const DAY = 24 * HOUR;
-
-const CONSTANTS = {
-  ONE_MINUTE: MIN,
-  FIVE_MINUTES: 5 * MIN,
-  TEN_MINUTES: 10 * MIN,
-  FIFTEEN_MINUTES: 15 * MIN,
-  THIRTY_MINUTES: 30 * MIN,
-
-  TWO_HOURS: 2 * HOUR,
-  FOUR_HOURS: 4 * HOUR,
-  SIX_HOURS: 6 * HOUR,
-  EIGHT_HOURS: 8 * HOUR,
-  TWELVE_HOURS: 12 * HOUR,
-
-  ONE_DAY: DAY,
-  TWO_DAY: 2 * DAY,
-  SIX_DAY: 6 * DAY,
-  TEN_DAY: 10 * DAY,
-
-  CARD_CACHE_SECONDS: DAY,
-  TOP_LANGS_CACHE_SECONDS: 6 * DAY,
-  PIN_CARD_CACHE_SECONDS: 10 * DAY,
-  ERROR_CACHE_SECONDS: 10 * MIN,
-};
-
 /**
  * Missing query parameter class.
  */
@@ -648,7 +620,6 @@ export {
   getCardColors,
   wrapTextMultiline,
   logger,
-  CONSTANTS,
   CustomError,
   MissingParamError,
   measureText,
diff --git a/tests/api.test.js b/tests/api.test.js
index caaa1c5a..e54764a3 100644
--- a/tests/api.test.js
+++ b/tests/api.test.js
@@ -13,7 +13,8 @@ import MockAdapter from "axios-mock-adapter";
 import api from "../api/index.js";
 import { calculateRank } from "../src/calculateRank.js";
 import { renderStatsCard } from "../src/cards/stats.js";
-import { CONSTANTS, renderError } from "../src/common/utils.js";
+import { renderError } from "../src/common/utils.js";
+import { CACHE_TTL, DURATIONS } from "../src/common/cache.js";
 
 /**
  * @type {import("../src/fetchers/stats").StatsData}
@@ -196,15 +197,15 @@ describe("Test /api/", () => {
       ["Content-Type", "image/svg+xml"],
       [
         "Cache-Control",
-        `max-age=${CONSTANTS.CARD_CACHE_SECONDS}, ` +
-          `s-maxage=${CONSTANTS.CARD_CACHE_SECONDS}, ` +
-          `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+        `max-age=${CACHE_TTL.STATS_CARD.DEFAULT}, ` +
+          `s-maxage=${CACHE_TTL.STATS_CARD.DEFAULT}, ` +
+          `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
       ],
     ]);
   });
 
   it("should set proper cache", async () => {
-    const cache_seconds = CONSTANTS.TWELVE_HOURS;
+    const cache_seconds = DURATIONS.TWELVE_HOURS;
     const { req, res } = faker({ cache_seconds }, data_stats);
     await api(req, res);
 
@@ -214,7 +215,7 @@ describe("Test /api/", () => {
         "Cache-Control",
         `max-age=${cache_seconds}, ` +
           `s-maxage=${cache_seconds}, ` +
-          `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+          `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
       ],
     ]);
   });
@@ -227,15 +228,16 @@ describe("Test /api/", () => {
       ["Content-Type", "image/svg+xml"],
       [
         "Cache-Control",
-        `max-age=${CONSTANTS.ERROR_CACHE_SECONDS}, ` +
-          `s-maxage=${CONSTANTS.ERROR_CACHE_SECONDS}, ` +
-          `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+        `max-age=${CACHE_TTL.ERROR}, ` +
+          `s-maxage=${CACHE_TTL.ERROR}, ` +
+          `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
       ],
     ]);
   });
 
   it("should properly set cache using CACHE_SECONDS env variable", async () => {
-    process.env.CACHE_SECONDS = "10000";
+    const cacheSeconds = "10000";
+    process.env.CACHE_SECONDS = cacheSeconds;
 
     const { req, res } = faker({}, data_stats);
     await api(req, res);
@@ -244,7 +246,9 @@ describe("Test /api/", () => {
       ["Content-Type", "image/svg+xml"],
       [
         "Cache-Control",
-        `max-age=10000, s-maxage=10000, stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+        `max-age=${cacheSeconds}, ` +
+          `s-maxage=${cacheSeconds}, ` +
+          `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
       ],
     ]);
   });
@@ -275,9 +279,9 @@ describe("Test /api/", () => {
         ["Content-Type", "image/svg+xml"],
         [
           "Cache-Control",
-          `max-age=${CONSTANTS.TWO_DAY}, ` +
-            `s-maxage=${CONSTANTS.TWO_DAY}, ` +
-            `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+          `max-age=${CACHE_TTL.STATS_CARD.MAX}, ` +
+            `s-maxage=${CACHE_TTL.STATS_CARD.MAX}, ` +
+            `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
         ],
       ]);
     }
@@ -291,9 +295,9 @@ describe("Test /api/", () => {
         ["Content-Type", "image/svg+xml"],
         [
           "Cache-Control",
-          `max-age=${CONSTANTS.TWELVE_HOURS}, ` +
-            `s-maxage=${CONSTANTS.TWELVE_HOURS}, ` +
-            `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+          `max-age=${CACHE_TTL.STATS_CARD.MIN}, ` +
+            `s-maxage=${CACHE_TTL.STATS_CARD.MIN}, ` +
+            `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
         ],
       ]);
     }
@@ -306,9 +310,9 @@ describe("Test /api/", () => {
         ["Content-Type", "image/svg+xml"],
         [
           "Cache-Control",
-          `max-age=${CONSTANTS.TWELVE_HOURS}, ` +
-            `s-maxage=${CONSTANTS.TWELVE_HOURS}, ` +
-            `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+          `max-age=${CACHE_TTL.STATS_CARD.MIN}, ` +
+            `s-maxage=${CACHE_TTL.STATS_CARD.MIN}, ` +
+            `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
         ],
       ]);
     }
diff --git a/tests/gist.test.js b/tests/gist.test.js
index e136c2b2..1f3b6000 100644
--- a/tests/gist.test.js
+++ b/tests/gist.test.js
@@ -6,7 +6,8 @@ import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
 import gist from "../api/gist.js";
 import { renderGistCard } from "../src/cards/gist.js";
-import { CONSTANTS, renderError } from "../src/common/utils.js";
+import { renderError } from "../src/common/utils.js";
+import { CACHE_TTL, DURATIONS } from "../src/common/cache.js";
 
 const gist_data = {
   data: {
@@ -192,9 +193,9 @@ describe("Test /api/gist", () => {
     expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
     expect(res.setHeader).toBeCalledWith(
       "Cache-Control",
-      `max-age=${CONSTANTS.TWO_DAY}, ` +
-        `s-maxage=${CONSTANTS.TWO_DAY}, ` +
-        `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+      `max-age=${CACHE_TTL.GIST_CARD.DEFAULT}, ` +
+        `s-maxage=${CACHE_TTL.GIST_CARD.DEFAULT}, ` +
+        `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
     );
   });
 });
diff --git a/tests/pin.test.js b/tests/pin.test.js
index 035f4fb5..91c756dd 100644
--- a/tests/pin.test.js
+++ b/tests/pin.test.js
@@ -6,7 +6,8 @@ import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
 import pin from "../api/pin.js";
 import { renderRepoCard } from "../src/cards/repo.js";
-import { CONSTANTS, renderError } from "../src/common/utils.js";
+import { renderError } from "../src/common/utils.js";
+import { CACHE_TTL, DURATIONS } from "../src/common/cache.js";
 
 const data_repo = {
   repository: {
@@ -233,9 +234,9 @@ describe("Test /api/pin", () => {
     expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
     expect(res.setHeader).toBeCalledWith(
       "Cache-Control",
-      `max-age=${CONSTANTS.PIN_CARD_CACHE_SECONDS}, ` +
-        `s-maxage=${CONSTANTS.PIN_CARD_CACHE_SECONDS}, ` +
-        `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+      `max-age=${CACHE_TTL.PIN_CARD.DEFAULT}, ` +
+        `s-maxage=${CACHE_TTL.PIN_CARD.DEFAULT}, ` +
+        `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
     );
   });
 });
diff --git a/tests/top-langs.test.js b/tests/top-langs.test.js
index 62ad3494..41ee95e1 100644
--- a/tests/top-langs.test.js
+++ b/tests/top-langs.test.js
@@ -6,7 +6,8 @@ import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
 import topLangs from "../api/top-langs.js";
 import { renderTopLanguages } from "../src/cards/top-languages.js";
-import { CONSTANTS, renderError } from "../src/common/utils.js";
+import { renderError } from "../src/common/utils.js";
+import { CACHE_TTL, DURATIONS } from "../src/common/cache.js";
 
 const data_langs = {
   data: {
@@ -238,9 +239,9 @@ describe("Test /api/top-langs", () => {
     expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
     expect(res.setHeader).toBeCalledWith(
       "Cache-Control",
-      `max-age=${CONSTANTS.TOP_LANGS_CACHE_SECONDS}, ` +
-        `s-maxage=${CONSTANTS.TOP_LANGS_CACHE_SECONDS}, ` +
-        `stale-while-revalidate=${CONSTANTS.ONE_DAY}`,
+      `max-age=${CACHE_TTL.TOP_LANGS_CARD.DEFAULT}, ` +
+        `s-maxage=${CACHE_TTL.TOP_LANGS_CARD.DEFAULT}, ` +
+        `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
     );
   });
 });
diff --git a/tests/wakatime.test.js b/tests/wakatime.test.js
index ce9843df..2b269c27 100644
--- a/tests/wakatime.test.js
+++ b/tests/wakatime.test.js
@@ -4,6 +4,7 @@ import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
 import wakatime from "../api/wakatime.js";
 import { renderWakatimeCard } from "../src/cards/wakatime.js";
+import { CACHE_TTL, DURATIONS } from "../src/common/cache.js";
 
 const wakaTimeData = {
   data: {
@@ -119,4 +120,25 @@ describe("Test /api/wakatime", () => {
     expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
     expect(res.send).toBeCalledWith(renderWakatimeCard(wakaTimeData.data, {}));
   });
+
+  it("should have proper cache", async () => {
+    const username = "anuraghazra";
+    const req = { query: { username } };
+    const res = { setHeader: jest.fn(), send: jest.fn() };
+    mock
+      .onGet(
+        `https://wakatime.com/api/v1/users/${username}/stats?is_including_today=true`,
+      )
+      .reply(200, wakaTimeData);
+
+    await wakatime(req, res);
+
+    expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
+    expect(res.setHeader).toBeCalledWith(
+      "Cache-Control",
+      `max-age=${CACHE_TTL.WAKATIME_CARD.DEFAULT}, ` +
+        `s-maxage=${CACHE_TTL.WAKATIME_CARD.DEFAULT}, ` +
+        `stale-while-revalidate=${DURATIONS.ONE_DAY}`,
+    );
+  });
 });