diff --git a/packages/patchlogr-core/package.json b/packages/patchlogr-core/package.json
index f3278a9..3e59ca5 100644
--- a/packages/patchlogr-core/package.json
+++ b/packages/patchlogr-core/package.json
@@ -4,7 +4,6 @@
     "publishConfig": {
         "access": "public"
     },
-    "type": "module",
     "main": "./dist/index.cjs",
     "module": "./dist/index.js",
     "types": "./dist/index.d.ts",
@@ -31,6 +30,7 @@
         "@patchlogr/types": "workspace:^"
     },
     "devDependencies": {
+        "@types/node": "^25.0.9",
         "esbuild": "^0.27.2",
         "openapi-types": "^12.1.3",
         "typescript": "^5.9.3",
diff --git a/packages/patchlogr-core/src/partition/__tests__/partitionByMethod.test.ts b/packages/patchlogr-core/src/partition/__tests__/partitionByMethod.test.ts
new file mode 100644
index 0000000..294ebba
--- /dev/null
+++ b/packages/patchlogr-core/src/partition/__tests__/partitionByMethod.test.ts
@@ -0,0 +1,69 @@
+import type { CanonicalSpec } from "@patchlogr/types";
+import { describe, expect, test } from "vitest";
+import { partitionByMethod } from "../partitionByMethod";
+
+describe("partitionByMethod", () => {
+    test("should group by HTTPMethod", () => {
+        const spec: CanonicalSpec = {
+            operations: {
+                "GET /user": {
+                    key: "GET /user",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user",
+                    request: { params: [] },
+                    responses: {},
+                },
+                "GET /user/{userId}": {
+                    key: "GET /user/{userId}",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user/{userId}",
+                    request: { params: [] },
+                    responses: {},
+                },
+            },
+        };
+
+        const partitions = partitionByMethod(spec).partitions;
+        expect(partitions).toHaveLength(1);
+        expect(partitions.get("GET")).toHaveLength(2);
+        expect(partitions.get("GET")?.[0]?.operationKey).toBe("GET /user");
+        expect(partitions.get("GET")?.[1]?.operationKey).toBe(
+            "GET /user/{userId}",
+        );
+    });
+
+    test("should group by multiple HTTPMethods", () => {
+        const spec: CanonicalSpec = {
+            operations: {
+                "GET /user": {
+                    key: "GET /user",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user",
+                    request: { params: [] },
+                    responses: {},
+                },
+                "POST /auth/login": {
+                    key: "POST /auth/login",
+                    doc: { tags: ["auth"] },
+                    method: "POST",
+                    path: "/auth/login",
+                    request: { params: [] },
+                    responses: {},
+                },
+            },
+        };
+
+        const partitions = partitionByMethod(spec).partitions;
+
+        expect(partitions).toHaveLength(2);
+        expect(partitions.get("GET")).toHaveLength(1);
+        expect(partitions.get("POST")).toHaveLength(1);
+        expect(partitions.get("GET")?.[0]?.operationKey).toBe("GET /user");
+        expect(partitions.get("POST")?.[0]?.operationKey).toBe(
+            "POST /auth/login",
+        );
+    });
+});
diff --git a/packages/patchlogr-core/src/partition/__tests__/partitionByTag.test.ts b/packages/patchlogr-core/src/partition/__tests__/partitionByTag.test.ts
new file mode 100644
index 0000000..d546346
--- /dev/null
+++ b/packages/patchlogr-core/src/partition/__tests__/partitionByTag.test.ts
@@ -0,0 +1,92 @@
+import type { CanonicalSpec } from "@patchlogr/types";
+import { describe, expect, test } from "vitest";
+import { DEFAULT_TAG, partitionByTag } from "../partitionByTag";
+
+describe("partitionByTag", () => {
+    test("should group by first tag", () => {
+        const spec: CanonicalSpec = {
+            operations: {
+                "GET /user": {
+                    key: "GET /user",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user",
+                    request: { params: [] },
+                    responses: {},
+                },
+                "GET /user/{userId}": {
+                    key: "GET /user/{userId}",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user/{userId}",
+                    request: { params: [] },
+                    responses: {},
+                },
+            },
+        };
+
+        const partitions = partitionByTag(spec).partitions;
+        expect(partitions).toHaveLength(1);
+        expect(partitions.get("user")).toHaveLength(2);
+        expect(partitions.get("user")?.[0]?.operationKey).toBe("GET /user");
+        expect(partitions.get("user")?.[1]?.operationKey).toBe(
+            "GET /user/{userId}",
+        );
+    });
+
+    test("should group by multiple tags", () => {
+        const spec: CanonicalSpec = {
+            operations: {
+                "GET /user": {
+                    key: "GET /user",
+                    doc: { tags: ["user"] },
+                    method: "GET",
+                    path: "/user",
+                    request: { params: [] },
+                    responses: {},
+                },
+                "POST /auth/login": {
+                    key: "POST /auth/login",
+                    doc: { tags: ["auth"] },
+                    method: "POST",
+                    path: "/auth/login",
+                    request: { params: [] },
+                    responses: {},
+                },
+            },
+        };
+
+        const partitions = partitionByTag(spec).partitions;
+
+        expect(partitions).toHaveLength(2);
+        expect(partitions.get("user")).toHaveLength(1);
+        expect(partitions.get("auth")).toHaveLength(1);
+        expect(partitions.get("user")?.[0]?.operationKey).toBe("GET /user");
+        expect(partitions.get("auth")?.[0]?.operationKey).toBe(
+            "POST /auth/login",
+        );
+    });
+
+    test("should group into default tag if tag not exists", () => {
+        const spec: CanonicalSpec = {
+            operations: {
+                "GET /user": {
+                    key: "GET /user",
+                    doc: { tags: [] },
+                    method: "GET",
+                    path: "/user",
+                    request: { params: [] },
+                    responses: {},
+                },
+            },
+        };
+
+        const partitions = partitionByTag(spec).partitions;
+
+        expect(partitions).toHaveLength(1);
+        expect(partitions.get(DEFAULT_TAG)).toHaveLength(1);
+        expect(partitions.get(DEFAULT_TAG)?.[0]?.operationKey).toBe(
+            "GET /user",
+        );
+    });
+});
diff --git a/packages/patchlogr-core/src/partition/partition.ts b/packages/patchlogr-core/src/partition/partition.ts
new file mode 100644
index 0000000..42b2b03
--- /dev/null
+++ b/packages/patchlogr-core/src/partition/partition.ts
@@ -0,0 +1,14 @@
+export type PartitionManifest = {
+    key: string;
+    hash: string;
+};
+
+export type Partition = {
+    hash: string;
+    operationKey: string;
+};
+
+export type PartitionedSpec = {
+    metadata: Record<string, unknown>;
+    partitions: Map<string, Partition[]>;
+};
diff --git a/packages/patchlogr-core/src/partition/partitionByMethod.ts b/packages/patchlogr-core/src/partition/partitionByMethod.ts
new file mode 100644
index 0000000..67524f6
--- /dev/null
+++ b/packages/patchlogr-core/src/partition/partitionByMethod.ts
@@ -0,0 +1,26 @@
+import type { CanonicalSpec, HTTPMethod } from "@patchlogr/types";
+import type { Partition, PartitionedSpec } from "./partition";
+
+import { createSHA256Hash } from "../utils/createHash";
+import { stableStringify } from "../utils/stableStringify";
+
+export function partitionByMethod(spec: CanonicalSpec): PartitionedSpec {
+    const partitions = new Map<HTTPMethod, Partition[]>();
+
+    Object.entries(spec.operations).forEach(([key, operation]) => {
+        const hash = createSHA256Hash(stableStringify(operation));
+
+        if (!partitions.has(operation.method))
+            partitions.set(operation.method, [{ hash, operationKey: key }]);
+        else
+            partitions.get(operation.method)?.push({ hash, operationKey: key });
+    });
+
+    return {
+        metadata: {
+            ...spec.info,
+            ...spec.security,
+        },
+        partitions,
+    };
+}
diff --git a/packages/patchlogr-core/src/partition/partitionByTag.ts b/packages/patchlogr-core/src/partition/partitionByTag.ts
new file mode 100644
index 0000000..da5c6b4
--- /dev/null
+++ b/packages/patchlogr-core/src/partition/partitionByTag.ts
@@ -0,0 +1,28 @@
+import type { CanonicalSpec } from "@patchlogr/types";
+import type { Partition, PartitionedSpec } from "./partition";
+
+import { createSHA256Hash } from "../utils/createHash";
+import { stableStringify } from "../utils/stableStringify";
+
+export const DEFAULT_TAG = "__DEFAULT__";
+
+export function partitionByTag(spec: CanonicalSpec): PartitionedSpec {
+    const partitions = new Map<string, Partition[]>();
+
+    Object.entries(spec.operations).forEach(([key, operation]) => {
+        const tag = operation.doc?.tags?.[0] || DEFAULT_TAG;
+        const hash = createSHA256Hash(stableStringify(operation));
+
+        if (!partitions.has(tag))
+            partitions.set(tag, [{ hash, operationKey: key }]);
+        else partitions.get(tag)?.push({ hash, operationKey: key });
+    });
+
+    return {
+        metadata: {
+            ...spec.info,
+            ...spec.security,
+        },
+        partitions,
+    };
+}
diff --git a/packages/patchlogr-core/src/utils/__tests__/createHash.test.ts b/packages/patchlogr-core/src/utils/__tests__/createHash.test.ts
new file mode 100644
index 0000000..de4fa42
--- /dev/null
+++ b/packages/patchlogr-core/src/utils/__tests__/createHash.test.ts
@@ -0,0 +1,11 @@
+import { describe, test, expect } from "vitest";
+import { createSHA256Hash } from "../createHash";
+
+describe("createHash", () => {
+    describe("createSHA256Hash", () => {
+        test("sha256 must be deterministic", () => {
+            const hash = createSHA256Hash("test");
+            expect(hash).toBe(createSHA256Hash("test"));
+        });
+    });
+});
diff --git a/packages/patchlogr-core/src/utils/__tests__/stableStringify.test.ts b/packages/patchlogr-core/src/utils/__tests__/stableStringify.test.ts
new file mode 100644
index 0000000..1395438
--- /dev/null
+++ b/packages/patchlogr-core/src/utils/__tests__/stableStringify.test.ts
@@ -0,0 +1,114 @@
+import { describe, test, expect } from "vitest";
+import { stableStringify } from "../stableStringify";
+
+describe("stableStringify", () => {
+    test("should stringify json", () => {
+        expect(stableStringify({ a: 1, b: 2, c: 3 })).toBe(
+            JSON.stringify({ a: 1, b: 2, c: 3 }),
+        );
+    });
+
+    test("should stringify json in a stable order", () => {
+        const obj1 = { a: 1, b: 2 };
+        const obj2 = { b: 2, a: 1 };
+
+        expect(stableStringify(obj1)).toBe(stableStringify(obj2));
+    });
+
+    test("should stringify nested objects with stable key order", () => {
+        const obj1 = { a: 1, nested: { x: 10, y: 20 } };
+        const obj2 = { nested: { y: 20, x: 10 }, a: 1 };
+
+        expect(stableStringify(obj1)).toBe(stableStringify(obj2));
+    });
+
+    test("should stringify deeply nested objects with stable key order", () => {
+        const obj1 = {
+            level1: {
+                level2: {
+                    c: 3,
+                    b: 2,
+                    a: 1,
+                },
+            },
+        };
+        const obj2 = {
+            level1: {
+                level2: {
+                    a: 1,
+                    b: 2,
+                    c: 3,
+                },
+            },
+        };
+
+        expect(stableStringify(obj1)).toBe(stableStringify(obj2));
+    });
+
+    test("should stringify arrays containing objects with stable key order", () => {
+        const obj1 = {
+            items: [
+                { z: 3, y: 2, x: 1 },
+                { c: "c", b: "b", a: "a" },
+            ],
+        };
+        const obj2 = {
+            items: [
+                { x: 1, y: 2, z: 3 },
+                { a: "a", b: "b", c: "c" },
+            ],
+        };
+
+        expect(stableStringify(obj1)).toBe(stableStringify(obj2));
+    });
+
+    test("should handle null and primitive values correctly", () => {
+        const obj1 = { b: null, a: 1, c: "string", d: true };
+        const obj2 = { d: true, c: "string", a: 1, b: null };
+
+        expect(stableStringify(obj1)).toBe(stableStringify(obj2));
+    });
+
+    test("should produce deterministic output for canonical spec hashing", () => {
+        const spec1 = {
+            operationId: "getUser",
+            responses: {
+                "200": {
+                    schema: {
+                        type: "object",
+                        properties: { name: {}, id: {} },
+                    },
+                },
+            },
+            parameters: [{ name: "id", in: "path", required: true }],
+        };
+        const spec2 = {
+            parameters: [{ required: true, in: "path", name: "id" }],
+            responses: {
+                "200": {
+                    schema: {
+                        properties: { id: {}, name: {} },
+                        type: "object",
+                    },
+                },
+            },
+            operationId: "getUser",
+        };
+
+        expect(stableStringify(spec1)).toBe(stableStringify(spec2));
+    });
+
+    test("should output nested object keys in sorted order", () => {
+        const obj = { b: 2, a: { z: 1, y: 2 } };
+        const result = stableStringify(obj);
+
+        expect(result).toBe(JSON.stringify({ a: { y: 2, z: 1 }, b: 2 }));
+    });
+
+    test("should sort keys in arrays of objects", () => {
+        const obj = { items: [{ b: 1, a: 2 }] };
+        const result = stableStringify(obj);
+
+        expect(result).toBe(JSON.stringify({ items: [{ a: 2, b: 1 }] }));
+    });
+});
diff --git a/packages/patchlogr-core/src/utils/createHash.ts b/packages/patchlogr-core/src/utils/createHash.ts
new file mode 100644
index 0000000..ad7e27b
--- /dev/null
+++ b/packages/patchlogr-core/src/utils/createHash.ts
@@ -0,0 +1,5 @@
+import crypto from "crypto";
+
+export function createSHA256Hash(data: string) {
+    return crypto.createHash("sha256").update(data).digest("hex");
+}
diff --git a/packages/patchlogr-core/src/utils/stableStringify.ts b/packages/patchlogr-core/src/utils/stableStringify.ts
new file mode 100644
index 0000000..f9143b3
--- /dev/null
+++ b/packages/patchlogr-core/src/utils/stableStringify.ts
@@ -0,0 +1,26 @@
+export function stableStringify(obj: Record<string, unknown>): string {
+    return JSON.stringify(sortObjectKeys(obj));
+}
+
+function sortObjectKeys(value: unknown): unknown {
+    if (value === null || value === undefined) {
+        return value;
+    }
+
+    if (Array.isArray(value)) {
+        return value.map(sortObjectKeys);
+    }
+
+    if (typeof value === "object") {
+        const sortedObj: Record<string, unknown> = {};
+        const keys = Object.keys(value).sort();
+
+        for (const key of keys) {
+            sortedObj[key] = sortObjectKeys(value[key]);
+        }
+
+        return sortedObj;
+    }
+
+    return value;
+}
diff --git a/yarn.lock b/yarn.lock
index 3f3c5a7..84eb7f6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -424,6 +424,7 @@ __metadata:
     "@apidevtools/swagger-parser": "npm:^12.1.0"
     "@patchlogr/oas": "workspace:^"
     "@patchlogr/types": "workspace:^"
+    "@types/node": "npm:^25.0.9"
     esbuild: "npm:^0.27.2"
     openapi-types: "npm:^12.1.3"
     typescript: "npm:^5.9.3"