diff --git a/.changeset/fancy-actors-wait.md b/.changeset/fancy-actors-wait.md
new file mode 100644
index 00000000..aee8635a
--- /dev/null
+++ b/.changeset/fancy-actors-wait.md
@@ -0,0 +1,5 @@
+---
+"swagger-typescript-api": minor
+---
+
+Use `c12` for wider configuration file format support.
diff --git a/index.ts b/index.ts
index 182db548..bc9f9295 100644
--- a/index.ts
+++ b/index.ts
@@ -1,15 +1,14 @@
 #!/usr/bin/env node
 
 import * as path from "node:path";
-import * as url from "node:url";
+import { loadConfig } from "c12";
 import { defineCommand, runMain } from "citty";
-import { consola } from "consola";
 import packageJson from "./package.json" with { type: "json" };
 import { TemplatesGenConfig } from "./src/commands/generate-templates/configuration.js";
 import { CodeGenConfig } from "./src/configuration.js";
 import { HTTP_CLIENT } from "./src/constants.js";
 import { generateApi, generateTemplates } from "./src/index.js";
-import type { HttpClientType } from "./types/index.js";
+import type { GenerateApiParams, HttpClientType } from "./types/index.js";
 
 const templateGenBaseConfig = new TemplatesGenConfig({});
 
@@ -288,22 +287,9 @@ const generateCommand = defineCommand({
     },
   },
   run: async ({ args }) => {
-    let customConfig = undefined;
-
-    if (args["custom-config"]) {
-      try {
-        const customConfigPath = url
-          .pathToFileURL(path.resolve(process.cwd(), args["custom-config"]))
-          .toString();
-        customConfig = await import(customConfigPath);
-        customConfig = customConfig.default || customConfig;
-        if (customConfig) {
-          consola.info(`Found custom config at: ${customConfigPath}`);
-        }
-      } catch (error) {
-        consola.error("Error loading custom config:", error);
-      }
-    }
+    const customConfig = await loadConfig<GenerateApiParams>({
+      configFile: args["custom-config"],
+    });
 
     await generateApi({
       addReadonly: args["add-readonly"],
@@ -346,7 +332,7 @@ const generateCommand = defineCommand({
       typeSuffix: args["type-suffix"],
       unwrapResponseData: args["unwrap-response-data"],
       url: args.path,
-      ...customConfig,
+      ...customConfig.config,
     });
   },
 });
diff --git a/package.json b/package.json
index 207965e8..4da84782 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
   },
   "dependencies": {
     "@types/swagger-schema-official": "^2.0.25",
+    "c12": "3.0.2",
     "citty": "^0.1.6",
     "consola": "^3.4.2",
     "cosmiconfig": "^9.0.0",
diff --git a/yarn.lock b/yarn.lock
index 85681698..4f9ada22 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1156,6 +1156,31 @@ __metadata:
   languageName: node
   linkType: hard
 
+"c12@npm:3.0.2":
+  version: 3.0.2
+  resolution: "c12@npm:3.0.2"
+  dependencies:
+    chokidar: "npm:^4.0.3"
+    confbox: "npm:^0.1.8"
+    defu: "npm:^6.1.4"
+    dotenv: "npm:^16.4.7"
+    exsolve: "npm:^1.0.0"
+    giget: "npm:^2.0.0"
+    jiti: "npm:^2.4.2"
+    ohash: "npm:^2.0.5"
+    pathe: "npm:^2.0.3"
+    perfect-debounce: "npm:^1.0.0"
+    pkg-types: "npm:^2.0.0"
+    rc9: "npm:^2.1.2"
+  peerDependencies:
+    magicast: ^0.3.5
+  peerDependenciesMeta:
+    magicast:
+      optional: true
+  checksum: 10c0/5ff4193c396f7ab05b52bcce9146b954e16cda16c317e018b8aa8d810b7cc678978fdcb203f6dde99276949ec25bb49104c7022d6c8915245425404abcb39750
+  languageName: node
+  linkType: hard
+
 "cac@npm:^6.7.14":
   version: 6.7.14
   resolution: "cac@npm:6.7.14"
@@ -1309,6 +1334,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"confbox@npm:^0.1.8":
+  version: 0.1.8
+  resolution: "confbox@npm:0.1.8"
+  checksum: 10c0/fc2c68d97cb54d885b10b63e45bd8da83a8a71459d3ecf1825143dd4c7f9f1b696b3283e07d9d12a144c1301c2ebc7842380bdf0014e55acc4ae1c9550102418
+  languageName: node
+  linkType: hard
+
+"confbox@npm:^0.2.1":
+  version: 0.2.1
+  resolution: "confbox@npm:0.2.1"
+  checksum: 10c0/bd47ab24bf2c3c6ec3386ca59e934b34421c39b0a50aa8c47ab5da7fdf663965ed4793240e5377e74d91b73d3dcd05568c0e91608a72b327877f60cc51ec39e2
+  languageName: node
+  linkType: hard
+
 "consola@npm:^3.2.3, consola@npm:^3.4.0, consola@npm:^3.4.2":
   version: 3.4.2
   resolution: "consola@npm:3.4.2"
@@ -1370,6 +1409,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"defu@npm:^6.1.4":
+  version: 6.1.4
+  resolution: "defu@npm:6.1.4"
+  checksum: 10c0/2d6cc366262dc0cb8096e429368e44052fdf43ed48e53ad84cc7c9407f890301aa5fcb80d0995abaaf842b3949f154d060be4160f7a46cb2bc2f7726c81526f5
+  languageName: node
+  linkType: hard
+
 "delayed-stream@npm:~1.0.0":
   version: 1.0.0
   resolution: "delayed-stream@npm:1.0.0"
@@ -1377,6 +1423,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"destr@npm:^2.0.3":
+  version: 2.0.3
+  resolution: "destr@npm:2.0.3"
+  checksum: 10c0/10e7eff5149e2839a4dd29a1e9617c3c675a3b53608d78d74fc6f4abc31daa977e6de08e0eea78965527a0d5a35467ae2f9624e0a4646d54aa1162caa094473e
+  languageName: node
+  linkType: hard
+
 "detect-indent@npm:^6.0.0":
   version: 6.1.0
   resolution: "detect-indent@npm:6.1.0"
@@ -1393,6 +1446,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"dotenv@npm:^16.4.7":
+  version: 16.4.7
+  resolution: "dotenv@npm:16.4.7"
+  checksum: 10c0/be9f597e36a8daf834452daa1f4cc30e5375a5968f98f46d89b16b983c567398a330580c88395069a77473943c06b877d1ca25b4afafcdd6d4adb549e8293462
+  languageName: node
+  linkType: hard
+
 "dotenv@npm:^8.1.0":
   version: 8.6.0
   resolution: "dotenv@npm:8.6.0"
@@ -1656,6 +1716,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"exsolve@npm:^1.0.0, exsolve@npm:^1.0.1":
+  version: 1.0.4
+  resolution: "exsolve@npm:1.0.4"
+  checksum: 10c0/475a5cb8961fdc91dfe0ff7d5fad601cce3ac27226e3966d18277c10ddace696adc986871115383c449bac110c02e6eaaf5ae9d983b2cc731df805ecb55f2482
+  languageName: node
+  linkType: hard
+
 "extendable-error@npm:^0.1.5":
   version: 0.1.7
   resolution: "extendable-error@npm:0.1.7"
@@ -1858,6 +1925,22 @@ __metadata:
   languageName: node
   linkType: hard
 
+"giget@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "giget@npm:2.0.0"
+  dependencies:
+    citty: "npm:^0.1.6"
+    consola: "npm:^3.4.0"
+    defu: "npm:^6.1.4"
+    node-fetch-native: "npm:^1.6.6"
+    nypm: "npm:^0.6.0"
+    pathe: "npm:^2.0.3"
+  bin:
+    giget: dist/cli.mjs
+  checksum: 10c0/606d81652643936ee7f76653b4dcebc09703524ff7fd19692634ce69e3fc6775a377760d7508162379451c03bf43cc6f46716aeadeb803f7cef3fc53d0671396
+  languageName: node
+  linkType: hard
+
 "glob-parent@npm:^5.1.2":
   version: 5.1.2
   resolution: "glob-parent@npm:5.1.2"
@@ -2111,6 +2194,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"jiti@npm:^2.4.2":
+  version: 2.4.2
+  resolution: "jiti@npm:2.4.2"
+  bin:
+    jiti: lib/jiti-cli.mjs
+  checksum: 10c0/4ceac133a08c8faff7eac84aabb917e85e8257f5ad659e843004ce76e981c457c390a220881748ac67ba1b940b9b729b30fb85cbaf6e7989f04b6002c94da331
+  languageName: node
+  linkType: hard
+
 "joycon@npm:^3.1.1":
   version: 3.1.1
   resolution: "joycon@npm:3.1.1"
@@ -2461,6 +2553,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"node-fetch-native@npm:^1.6.6":
+  version: 1.6.6
+  resolution: "node-fetch-native@npm:1.6.6"
+  checksum: 10c0/8c12dab0e640d8bc126a03d604af9cf3fc1b87f2cda5af0c71601079d5ed835c1dc149c7042b61c83f252a382e1cf1e541788f4c9e8e6c089af77497190f5dc3
+  languageName: node
+  linkType: hard
+
 "node-fetch@npm:^2.5.0, node-fetch@npm:^2.6.1":
   version: 2.7.0
   resolution: "node-fetch@npm:2.7.0"
@@ -2515,6 +2614,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nypm@npm:^0.6.0":
+  version: 0.6.0
+  resolution: "nypm@npm:0.6.0"
+  dependencies:
+    citty: "npm:^0.1.6"
+    consola: "npm:^3.4.0"
+    pathe: "npm:^2.0.3"
+    pkg-types: "npm:^2.0.0"
+    tinyexec: "npm:^0.3.2"
+  bin:
+    nypm: dist/cli.mjs
+  checksum: 10c0/899f16c2df1bdf3ef4de5f7d4ed5530e2e1ca097cc7dedbaa25abb6b8e44bb470c25cd26639f6e3e4f5734867e61f7f77c4ed5dfbe86b2a1bdef4525a2dc0026
+  languageName: node
+  linkType: hard
+
 "oas-kit-common@npm:^1.0.8":
   version: 1.0.8
   resolution: "oas-kit-common@npm:1.0.8"
@@ -2580,6 +2694,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ohash@npm:^2.0.5":
+  version: 2.0.11
+  resolution: "ohash@npm:2.0.11"
+  checksum: 10c0/d07c8d79cc26da082c1a7c8d5b56c399dd4ed3b2bd069fcae6bae78c99a9bcc3ad813b1e1f49ca2f335292846d689c6141a762cf078727d2302a33d414e69c79
+  languageName: node
+  linkType: hard
+
 "openapi-types@npm:12.1.3, openapi-types@npm:^12.1.0":
   version: 12.1.3
   resolution: "openapi-types@npm:12.1.3"
@@ -2731,6 +2852,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"perfect-debounce@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "perfect-debounce@npm:1.0.0"
+  checksum: 10c0/e2baac416cae046ef1b270812cf9ccfb0f91c04ea36ac7f5b00bc84cb7f41bdbba087c0ab21b4e02a7ef3a1f1f6db399f137cecec46868bd7d8d88c2a9ee431f
+  languageName: node
+  linkType: hard
+
 "picocolors@npm:^1.0.0, picocolors@npm:^1.1.0, picocolors@npm:^1.1.1":
   version: 1.1.1
   resolution: "picocolors@npm:1.1.1"
@@ -2766,6 +2894,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"pkg-types@npm:^2.0.0":
+  version: 2.1.0
+  resolution: "pkg-types@npm:2.1.0"
+  dependencies:
+    confbox: "npm:^0.2.1"
+    exsolve: "npm:^1.0.1"
+    pathe: "npm:^2.0.3"
+  checksum: 10c0/7729d0a2367ba0aa2caf0f84a6ff0b73b13f4e9a3d62c229ddfa6d45d1f3898f590acdbaa64d779d56737d4ebea2d085961efd59094b8adf8baa34d829599b75
+  languageName: node
+  linkType: hard
+
 "postcss-load-config@npm:^6.0.1":
   version: 6.0.1
   resolution: "postcss-load-config@npm:6.0.1"
@@ -2863,6 +3002,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"rc9@npm:^2.1.2":
+  version: 2.1.2
+  resolution: "rc9@npm:2.1.2"
+  dependencies:
+    defu: "npm:^6.1.4"
+    destr: "npm:^2.0.3"
+  checksum: 10c0/a2ead3b94bf033e35e4ea40d70062a09feddb8f589c3f5a8fe4e9342976974296aee9f6e9e72bd5e78e6ae4b7bc16dc244f63699fd7322c16314e3238db982c9
+  languageName: node
+  linkType: hard
+
 "read-yaml-file@npm:^1.1.0":
   version: 1.1.0
   resolution: "read-yaml-file@npm:1.1.0"
@@ -3313,6 +3462,7 @@ __metadata:
     "@types/swagger-schema-official": "npm:^2.0.25"
     "@types/swagger2openapi": "npm:7.0.4"
     axios: "npm:1.8.4"
+    c12: "npm:3.0.2"
     citty: "npm:^0.1.6"
     consola: "npm:^3.4.2"
     cosmiconfig: "npm:^9.0.0"