diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 70f3393..6390cfc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -191,12 +191,10 @@ jobs:
         id: setup_bun
         with:
           registries: |
-            [
-              {
-                "url": "https://username:password@registry.myorg.com/",
-                "scope": "@myorg"
-              }
-            ]
+            https://registry.npmjs.org/
+            @myorg:https://username:password@registry.myorg.com/
+            @another:https://registry.another.com/
+            @partner:https://registry.partner.com/|basic_token
 
       - name: Run Bun
         id: run_bun
diff --git a/bunfig.toml b/bunfig.toml
deleted file mode 100644
index 7868d6b..0000000
--- a/bunfig.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[install]
-saveTextLockfile = true
diff --git a/src/bunfig.ts b/src/bunfig.ts
index 522eeb6..cfa1158 100644
--- a/src/bunfig.ts
+++ b/src/bunfig.ts
@@ -1,12 +1,7 @@
 import { existsSync, readFileSync, writeFileSync } from "node:fs";
 import { info } from "@actions/core";
 import { parse, stringify } from "@iarna/toml";
-
-export type Registry = {
-  url: string;
-  scope: string;
-  token?: string;
-};
+import { Registry } from "./registry";
 
 type BunfigConfig = {
   install?: {
diff --git a/src/index.ts b/src/index.ts
index 72b9188..716755d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,12 +2,13 @@ import { tmpdir } from "node:os";
 import { getInput, setOutput, setFailed, getBooleanInput } from "@actions/core";
 import runAction from "./action.js";
 import { readVersionFromFile } from "./utils.js";
+import { parseRegistries } from "./registry.js";
 
 if (!process.env.RUNNER_TEMP) {
   process.env.RUNNER_TEMP = tmpdir();
 }
 
-const registries = JSON.parse(getInput("registries") || "[]");
+const registries = parseRegistries(getInput("registries"));
 const registryUrl = getInput("registry-url");
 const scope = getInput("scope");
 
diff --git a/src/registry.ts b/src/registry.ts
new file mode 100644
index 0000000..af711d8
--- /dev/null
+++ b/src/registry.ts
@@ -0,0 +1,62 @@
+export type Registry = {
+  url: string;
+  scope: string;
+  token?: string;
+};
+
+/**
+ * Parse registries from the simplified format:
+ * - Default registry: https://registry.npmjs.org/
+ * - Default registry with token: https://registry.npmjs.org/|token123
+ * - With scope and credentials in URL: @myorg:https://username:password@registry.myorg.com/
+ * - With scope and separate token: @partner:https://registry.partner.com/|basic_token
+ */
+export function parseRegistries(input: string): Registry[] {
+  if (!input?.trim()) return [];
+
+  return input
+    .split("\n")
+    .map((line) => line.trim())
+    .filter(Boolean)
+    .map(parseLine)
+    .filter(Boolean) as Registry[];
+}
+
+function parseLine(line: string): Registry | null {
+  const scopeMatch = line.match(
+    /^(@[a-z0-9-_.]+|[a-z0-9-_.]+(?=:[a-z]+:\/\/)):(.+)$/i
+  );
+
+  if (scopeMatch) {
+    const scope = scopeMatch[1];
+    const urlPart = scopeMatch[2].trim();
+
+    const [url, token] = urlPart.split("|", 2).map((p) => p?.trim());
+
+    try {
+      new URL(url);
+
+      return {
+        url,
+        scope,
+        ...(token && { token }),
+      };
+    } catch (e) {
+      throw new Error(`Invalid URL in registry configuration: ${url}`);
+    }
+  } else {
+    const [url, token] = line.split("|", 2).map((p) => p?.trim());
+
+    try {
+      new URL(url);
+
+      return {
+        url,
+        scope: "",
+        ...(token && { token }),
+      };
+    } catch (e) {
+      throw new Error(`Invalid URL in registry configuration: ${url}`);
+    }
+  }
+}
diff --git a/tests/registry.spec.ts b/tests/registry.spec.ts
new file mode 100644
index 0000000..46acdb8
--- /dev/null
+++ b/tests/registry.spec.ts
@@ -0,0 +1,170 @@
+import { describe, expect, it } from "bun:test";
+import { parseRegistries } from "../src/registry";
+
+describe("registry", () => {
+  describe("parseRegistries", () => {
+    it("should return an empty array for empty input", () => {
+      expect(parseRegistries("")).toEqual([]);
+      expect(parseRegistries("   ")).toEqual([]);
+      expect(parseRegistries(null as any)).toEqual([]);
+      expect(parseRegistries(undefined as any)).toEqual([]);
+    });
+
+    it("should parse default registry without token", () => {
+      const input = "https://registry.npmjs.org/";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+      ]);
+    });
+
+    it("should parse default registry with token", () => {
+      const input = "https://registry.npmjs.org/|npm_token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+          token: "npm_token123",
+        },
+      ]);
+    });
+
+    it("should parse scoped registry with URL credentials", () => {
+      const input = "@myorg:https://username:password@registry.myorg.com/";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://username:password@registry.myorg.com/",
+          scope: "@myorg",
+        },
+      ]);
+    });
+
+    it("should parse scoped registry with separate token", () => {
+      const input = "@partner:https://registry.partner.com/|token_abc123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.partner.com/",
+          scope: "@partner",
+          token: "token_abc123",
+        },
+      ]);
+    });
+
+    it("should parse multiple registries", () => {
+      const input = `
+        https://registry.npmjs.org/
+        @myorg:https://username:password@registry.myorg.com/
+        @partner:https://registry.partner.com/|token_abc123
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+        {
+          url: "https://username:password@registry.myorg.com/",
+          scope: "@myorg",
+        },
+        {
+          url: "https://registry.partner.com/",
+          scope: "@partner",
+          token: "token_abc123",
+        },
+      ]);
+    });
+
+    it("should handle scope names without @ prefix", () => {
+      const input = "myorg:https://registry.myorg.com/|token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/",
+          scope: "myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should throw error for invalid URLs", () => {
+      expect(() => {
+        parseRegistries("@myorg:not-a-valid-url");
+      }).toThrow("Invalid URL in registry configuration: not-a-valid-url");
+
+      expect(() => {
+        parseRegistries("also-not-a-valid-url");
+      }).toThrow("Invalid URL in registry configuration: also-not-a-valid-url");
+    });
+
+    it("should handle whitespace and empty lines", () => {
+      const input = `
+
+        https://registry.npmjs.org/
+
+        @myorg:https://registry.myorg.com/|token123
+
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should handle URLs with paths and query parameters", () => {
+      const input =
+        "@myorg:https://registry.myorg.com/npm/registry/?timeout=5000|token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/npm/registry/?timeout=5000",
+          scope: "@myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should correctly handle scopes with hyphens and underscores", () => {
+      const input = `
+        @my-org:https://registry.myorg.com/
+        @my_org:https://registry.myorg.com/
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@my-org",
+        },
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@my_org",
+        },
+      ]);
+    });
+  });
+});