diff --git a/README.md b/README.md
index f2efc98e..134107b3 100644
--- a/README.md
+++ b/README.md
@@ -232,7 +232,7 @@ You can use all of the following options with standalone version on <redoc> tag
 * `expandResponses` - specify which responses to expand by default by response codes. Values should be passed as comma-separated list without spaces e.g. `expandResponses="200,201"`. Special value `"all"` expands all responses by default. Be careful: this option can slow-down documentation rendering time.
 * `maxDisplayedEnumValues` - display only specified number of enum values. hide rest values under spoiler.
 * `hideDownloadButton` - do not show "Download" spec button. **THIS DOESN'T MAKE YOUR SPEC PRIVATE**, it just hides the button.
-* `downloadFileName` - set file name and format of downloaded spec file, e.g. `openapi.yaml`, default `swagger.json`.
+* `downloadFileName` - set file name of downloaded spec file, e.g. `swagger.json`, default `openapi.json`. Spec file in `JSON` format. (only `redoc-cli`)
 * `hideHostname` - if set, the protocol and hostname is not shown in the operation definition.
 * `hideLoading` - do not show loading animation. Useful for small docs.
 * `hideSchemaPattern` - if set, the pattern is not shown in the schema.
diff --git a/src/services/RedocNormalizedOptions.ts b/src/services/RedocNormalizedOptions.ts
index a143eb6e..918a8cb7 100644
--- a/src/services/RedocNormalizedOptions.ts
+++ b/src/services/RedocNormalizedOptions.ts
@@ -1,4 +1,3 @@
-import * as path from 'path';
 import defaultTheme, { ResolvedThemeInterface, resolveTheme, ThemeInterface } from '../theme';
 import { querySelector } from '../utils/dom';
 import { isNumeric, mergeObjects } from '../utils/helpers';
@@ -155,20 +154,6 @@ export class RedocNormalizedOptions {
     return 0;
   }
 
-  static normalizeDownloadFileName(value: RedocRawOptions['downloadFileName']): string {
-    if (value) {
-      const extname = path.extname(value);
-      if (extname === '.json' || extname === '.yaml') {
-        return value;
-      } else {
-        console.warn(`downloadFileName must be a JSON or YAML file.`);
-      }
-    }
-
-    // Default value
-    return 'openapi.json';
-  }
-
   private static normalizeJsonSampleExpandLevel(level?: number | string | 'all'): number {
     if (level === 'all') {
       return +Infinity;
@@ -249,7 +234,7 @@ export class RedocNormalizedOptions {
     this.pathInMiddlePanel = argValueToBoolean(raw.pathInMiddlePanel);
     this.untrustedSpec = argValueToBoolean(raw.untrustedSpec);
     this.hideDownloadButton = argValueToBoolean(raw.hideDownloadButton);
-    this.downloadFileName = RedocNormalizedOptions.normalizeDownloadFileName(raw.downloadFileName);
+    this.downloadFileName = raw.downloadFileName || 'openapi.json';
     this.disableSearch = argValueToBoolean(raw.disableSearch);
     this.onlyRequiredInSamples = argValueToBoolean(raw.onlyRequiredInSamples);
     this.showExtensions = RedocNormalizedOptions.normalizeShowExtensions(raw.showExtensions);
diff --git a/src/services/__tests__/models/ApiInfo.test.ts b/src/services/__tests__/models/ApiInfo.test.ts
index b02527da..85390067 100644
--- a/src/services/__tests__/models/ApiInfo.test.ts
+++ b/src/services/__tests__/models/ApiInfo.test.ts
@@ -72,7 +72,7 @@ describe('Models', () => {
       } as any;
 
       const info = new ApiInfoModel(parser);
-      expect(info.downloadFileName).toEqual('swagger.json');
+      expect(info.downloadFileName).toEqual('openapi.json');
     });
 
     test('should correctly populate download file name', () => {
@@ -83,22 +83,9 @@ describe('Models', () => {
         },
       } as any;
 
-      const opts = new RedocNormalizedOptions({ downloadFileName: 'openapi.yaml' });
+      const opts = new RedocNormalizedOptions({ downloadFileName: 'filename.json' });
       const info = new ApiInfoModel(parser, opts);
-      expect(info.downloadFileName).toEqual('openapi.yaml');
-    });
-
-    test('should correctly populate default download file name if invalid extension is used', () => {
-      parser.spec = {
-        openapi: '3.0.0',
-        info: {
-          description: 'Test description',
-        },
-      } as any;
-
-      const opts = new RedocNormalizedOptions({ downloadFileName: 'nope.txt' });
-      const info = new ApiInfoModel(parser, opts);
-      expect(info.downloadFileName).toEqual('swagger.json');
+      expect(info.downloadFileName).toEqual('filename.json');
     });
   });
 });
diff --git a/src/services/models/ApiInfo.ts b/src/services/models/ApiInfo.ts
index d7b9e436..e9172443 100644
--- a/src/services/models/ApiInfo.ts
+++ b/src/services/models/ApiInfo.ts
@@ -1,5 +1,3 @@
-import * as path from 'path';
-import * as yaml from 'js-yaml';
 import { OpenAPIContact, OpenAPIInfo, OpenAPILicense } from '../../types';
 import { IS_BROWSER } from '../../utils/';
 import { OpenAPIParser } from '../OpenAPIParser';
@@ -41,13 +39,7 @@ export class ApiInfoModel implements OpenAPIInfo {
     }
 
     if (IS_BROWSER && window.Blob && window.URL && window.URL.createObjectURL) {
-      let specString: string;
-      if (path.extname(this.options.downloadFileName) === '.yaml') {
-        specString = yaml.dump(this.parser.spec);
-      } else {
-        specString = JSON.stringify(this.parser.spec, null, 2);
-      }
-      const blob = new Blob([specString], {
+      const blob = new Blob([JSON.stringify(this.parser.spec, null, 2)], {
         type: 'application/json',
       });
       return window.URL.createObjectURL(blob);