diff --git a/lib/index.d.ts b/lib/index.d.ts
index 43f30b9..f2ab828 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -1,10 +1,20 @@
-export declare function makeWanikani(apiKey?: string): import("axios-rate-limit").RateLimitedAxiosInstance & {
-    getKanji(): Promise<{
+import { RateLimitedAxiosInstance } from 'axios-rate-limit';
+/**
+ * https://docs.api.wanikani.com/20170710/#rate-limit
+ *
+ * Requests per minute	60
+ *
+ * @param apiKey @default process.env['WANIKANI_API_KEY']
+ * @returns
+ */
+export declare function makeWanikani(apiKey?: string): WaniKaniAxiosInstance;
+export interface WaniKaniAxiosInstance extends RateLimitedAxiosInstance {
+    kanji(params?: any): AsyncGenerator<{
         id: number;
         level: number;
         characters: string;
-    }[]>;
-    getVocab(): Promise<{
+    }>;
+    vocabulary(params?: any): AsyncGenerator<{
         id: number;
         level: number;
         characters: string;
@@ -12,13 +22,19 @@ export declare function makeWanikani(apiKey?: string): import("axios-rate-limit"
             ja: string;
             en: string;
         }[];
-    }[]>;
-    getLearnt(): Promise<{
+    }>;
+    subjects<T = any>(params?: any): AsyncGenerator<{
+        id: number;
+        object: string;
+        data_updated_at: string;
+        url: string;
+        data: T;
+    }>;
+    assignments(params?: any): AsyncGenerator<{
         id: number;
         srsLevel: number;
-    }[]>;
-};
-export declare type WaniKaniAxiosInstance = ReturnType<typeof makeWanikani>;
+    }>;
+}
 export interface IResource<T = any> {
     id: number;
     url: string;
diff --git a/lib/index.d.ts.map b/lib/index.d.ts.map
index c762c72..17fe8c5 100644
--- a/lib/index.d.ts.map
+++ b/lib/index.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAGA,wBAAgB,YAAY,CAAC,MAAM,SAAmC;;YA2B1D,MAAM;eACH,MAAM;oBACD,MAAM;;;YAsCd,MAAM;eACH,MAAM;oBACD,MAAM;mBACP;YACT,EAAE,EAAE,MAAM,CAAA;YACV,EAAE,EAAE,MAAM,CAAA;SACX,EAAE;;;YA2CC,MAAM;kBACA,MAAM;;EAoCvB;AAED,oBAAY,qBAAqB,GAAG,UAAU,CAAC,OAAO,YAAY,CAAC,CAAA;AAEnE,MAAM,WAAW,SAAS,CAAC,CAAC,GAAG,GAAG;IAChC,EAAE,EAAE,MAAM,CAAA;IACV,GAAG,EAAE,MAAM,CAAA;IACX,eAAe,EAAE,MAAM,CAAA;IACvB,IAAI,EAAE,CAAC,CAAA;CACR;AAED,MAAM,WAAW,WAAW,CAAC,CAAC,GAAG,GAAG;IAClC,MAAM,EAAE,MAAM,CAAA;IACd,GAAG,EAAE,MAAM,CAAA;IACX,KAAK,EAAE;QACL,QAAQ,CAAC,EAAE,MAAM,CAAA;QACjB,YAAY,CAAC,EAAE,MAAM,CAAA;QACrB,QAAQ,EAAE,MAAM,CAAA;KACjB,CAAA;IACD,WAAW,EAAE,MAAM,CAAA;IACnB,eAAe,EAAE,MAAM,CAAA;IACvB,IAAI,EAAE,CAAC,EAAE,CAAA;CACV;AAED,MAAM,WAAW,MAAM;IACrB,KAAK,EAAE,MAAM,CAAA;IACb,IAAI,EAAE,MAAM,CAAA;CACb"}
\ No newline at end of file
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AACA,OAAkB,EAAE,wBAAwB,EAAE,MAAM,kBAAkB,CAAA;AAEtE;;;;;;;GAOG;AACH,wBAAgB,YAAY,CAC1B,MAAM,SAAmC,GACxC,qBAAqB,CAmKvB;AAED,MAAM,WAAW,qBAAsB,SAAQ,wBAAwB;IACrE,KAAK,CAAC,MAAM,CAAC,EAAE,GAAG,GAAG,cAAc,CAAC;QAClC,EAAE,EAAE,MAAM,CAAA;QACV,KAAK,EAAE,MAAM,CAAA;QACb,UAAU,EAAE,MAAM,CAAA;KACnB,CAAC,CAAA;IACF,UAAU,CAAC,MAAM,CAAC,EAAE,GAAG,GAAG,cAAc,CAAC;QACvC,EAAE,EAAE,MAAM,CAAA;QACV,KAAK,EAAE,MAAM,CAAA;QACb,UAAU,EAAE,MAAM,CAAA;QAClB,SAAS,EAAE;YACT,EAAE,EAAE,MAAM,CAAA;YACV,EAAE,EAAE,MAAM,CAAA;SACX,EAAE,CAAA;KACJ,CAAC,CAAA;IACF,QAAQ,CAAC,CAAC,GAAG,GAAG,EACd,MAAM,CAAC,EAAE,GAAG,GACX,cAAc,CAAC;QAChB,EAAE,EAAE,MAAM,CAAA;QACV,MAAM,EAAE,MAAM,CAAA;QACd,eAAe,EAAE,MAAM,CAAA;QACvB,GAAG,EAAE,MAAM,CAAA;QACX,IAAI,EAAE,CAAC,CAAA;KACR,CAAC,CAAA;IACF,WAAW,CAAC,MAAM,CAAC,EAAE,GAAG,GAAG,cAAc,CAAC;QACxC,EAAE,EAAE,MAAM,CAAA;QACV,QAAQ,EAAE,MAAM,CAAA;KACjB,CAAC,CAAA;CACH;AAED,MAAM,WAAW,SAAS,CAAC,CAAC,GAAG,GAAG;IAChC,EAAE,EAAE,MAAM,CAAA;IACV,GAAG,EAAE,MAAM,CAAA;IACX,eAAe,EAAE,MAAM,CAAA;IACvB,IAAI,EAAE,CAAC,CAAA;CACR;AAED,MAAM,WAAW,WAAW,CAAC,CAAC,GAAG,GAAG;IAClC,MAAM,EAAE,MAAM,CAAA;IACd,GAAG,EAAE,MAAM,CAAA;IACX,KAAK,EAAE;QACL,QAAQ,CAAC,EAAE,MAAM,CAAA;QACjB,YAAY,CAAC,EAAE,MAAM,CAAA;QACrB,QAAQ,EAAE,MAAM,CAAA;KACjB,CAAA;IACD,WAAW,EAAE,MAAM,CAAA;IACnB,eAAe,EAAE,MAAM,CAAA;IACvB,IAAI,EAAE,CAAC,EAAE,CAAA;CACV;AAED,MAAM,WAAW,MAAM;IACrB,KAAK,EAAE,MAAM,CAAA;IACb,IAAI,EAAE,MAAM,CAAA;CACb"}
\ No newline at end of file
diff --git a/lib/index.js b/lib/index.js
index 77e8781..fc95ce4 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -6,6 +6,14 @@ Object.defineProperty(exports, "__esModule", { value: true });
 exports.makeWanikani = void 0;
 const axios_1 = __importDefault(require("axios"));
 const axios_rate_limit_1 = __importDefault(require("axios-rate-limit"));
+/**
+ * https://docs.api.wanikani.com/20170710/#rate-limit
+ *
+ * Requests per minute	60
+ *
+ * @param apiKey @default process.env['WANIKANI_API_KEY']
+ * @returns
+ */
 function makeWanikani(apiKey = process.env['WANIKANI_API_KEY']) {
     const wkApi = (0, axios_rate_limit_1.default)(axios_1.default.create({
         baseURL: 'https://api.wanikani.com/v2/',
@@ -15,12 +23,7 @@ function makeWanikani(apiKey = process.env['WANIKANI_API_KEY']) {
         validateStatus: function () {
             return true;
         },
-    }), 
-    /**
-     * https://docs.api.wanikani.com/20170710/#rate-limit
-     * Requests per minute	60
-     */
-    {
+    }), {
         /**
          * Per second
          */
@@ -28,74 +31,94 @@ function makeWanikani(apiKey = process.env['WANIKANI_API_KEY']) {
         perMilliseconds: 1000,
     });
     return Object.assign(wkApi, {
-        async getKanji() {
-            const allData = [];
+        async *kanji(params = {}) {
             let nextUrl = '/subjects';
             while (true) {
                 const r = await wkApi.get(nextUrl, {
                     params: {
+                        ...params,
                         types: 'kanji',
                     },
                 });
-                allData.push(...r.data.data.map((d) => ({
-                    id: d.id,
-                    level: d.data.level,
-                    characters: d.data.characters,
-                })));
+                for (const d of r.data.data) {
+                    yield {
+                        id: d.id,
+                        level: d.data.level,
+                        characters: d.data.characters,
+                    };
+                }
                 console.error(r.data.url);
                 nextUrl = r.data.pages.next_url || '';
                 if (!nextUrl) {
                     break;
                 }
             }
-            return allData;
         },
-        async getVocab() {
-            const allData = [];
+        async *vocabulary(params = {}) {
             let nextUrl = '/subjects';
             while (true) {
                 const r = await wkApi.get(nextUrl, {
                     params: {
+                        ...params,
                         types: 'vocabulary',
                     },
                 });
-                allData.push(...r.data.data.map((d) => ({
-                    id: d.id,
-                    level: d.data.level,
-                    characters: d.data.characters,
-                    sentences: d.data.context_sentences,
-                })));
+                for (const d of r.data.data) {
+                    yield {
+                        id: d.id,
+                        level: d.data.level,
+                        characters: d.data.characters,
+                        sentences: d.data.context_sentences,
+                    };
+                }
                 console.error(r.data.url);
                 nextUrl = r.data.pages.next_url || '';
                 if (!nextUrl) {
                     break;
                 }
             }
-            return allData;
         },
-        async getLearnt() {
-            const allData = [];
+        async *subjects(params = {}) {
+            let nextUrl = '/subjects';
+            while (true) {
+                const r = await wkApi.get(nextUrl, { params });
+                for (const d of r.data.data) {
+                    yield {
+                        id: d.id,
+                        data_updated_at: d.data_updated_at,
+                        object: d.object,
+                        url: d.url,
+                        data: d.data,
+                    };
+                }
+                console.error(r.data.url);
+                nextUrl = r.data.pages.next_url || '';
+                if (!nextUrl) {
+                    break;
+                }
+            }
+        },
+        async *assignments(params = {
+            unlocked: 'true',
+        }) {
             let nextUrl = '/assignments';
             while (true) {
                 const r = await wkApi.get(nextUrl, {
-                    params: {
-                        unlocked: 'true',
-                    },
+                    params,
                 });
                 console.error(r.data.url);
-                r.data.data.map((d) => {
-                    allData.push({
+                for (const d of r.data.data) {
+                    yield {
                         id: d.data.subject_id,
                         srsLevel: d.data.srs_stage,
-                    });
-                });
+                    };
+                }
                 nextUrl = r.data.pages.next_url || '';
                 if (!nextUrl) {
                     break;
                 }
             }
-            return allData;
-        }
+        },
     });
 }
 exports.makeWanikani = makeWanikani;
diff --git a/lib/index.js.map b/lib/index.js.map
index e09b232..35e8353 100644
--- a/lib/index.js.map
+++ b/lib/index.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file