diff --git a/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-2-0.ts b/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-2-0.ts
new file mode 100644
index 000000000..4b1084c92
--- /dev/null
+++ b/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-2-0.ts
@@ -0,0 +1,57 @@
+import { DiagnosticSeverity } from 'vscode-languageserver-types';
+
+import ApilintCodes from '../../../codes';
+import { LinterMeta } from '../../../../apidom-language-types';
+import { OpenAPI2 } from '../../../openapi/target-specs';
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+const allowedFieldsOpenAPI2_0Lint: LinterMeta = {
+  code: ApilintCodes.NOT_ALLOWED_FIELDS,
+  source: 'apilint',
+  message: 'Object includes not allowed fields',
+  /**
+   * Technically additional JSON Schema keywords can be present, they are just unsupported.
+   * That's why we use Warning severity here instead of Error.
+   */
+  severity: DiagnosticSeverity.Warning,
+  linterFunction: 'allowedFields',
+  linterParams: [
+    [
+      '$ref',
+      'format',
+      'title',
+      'description',
+      'default',
+      'multipleOf',
+      'maximum',
+      'exclusiveMaximum',
+      'minimum',
+      'exclusiveMinimum',
+      'maxLength',
+      'minLength',
+      'pattern',
+      'maxItems',
+      'minItems',
+      'uniqueItems',
+      'maxProperties',
+      'minProperties',
+      'required',
+      'enum',
+      'type',
+      'items',
+      'allOf',
+      'properties',
+      'additionalProperties',
+      'discriminator',
+      'readOnly',
+      'xml',
+      'externalDocs',
+      'example',
+    ],
+    'x-',
+  ],
+  marker: 'key',
+  targetSpecs: OpenAPI2,
+};
+
+export default allowedFieldsOpenAPI2_0Lint;
diff --git a/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-3-0.ts b/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-3-0.ts
new file mode 100644
index 000000000..56f2e443d
--- /dev/null
+++ b/packages/apidom-ls/src/config/common/schema/lint/allowed-fields-openapi-3-0.ts
@@ -0,0 +1,63 @@
+import { DiagnosticSeverity } from 'vscode-languageserver-types';
+
+import ApilintCodes from '../../../codes';
+import { LinterMeta } from '../../../../apidom-language-types';
+import { OpenAPI30 } from '../../../openapi/target-specs';
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+const allowedFieldsOpenAPI3_0Lint: LinterMeta = {
+  code: ApilintCodes.NOT_ALLOWED_FIELDS,
+  source: 'apilint',
+  message: 'Object includes not allowed fields',
+  /**
+   * Technically additional JSON Schema keywords can be present, they are just unsupported.
+   * That's why we use Warning severity here instead of Error.
+   */
+  severity: DiagnosticSeverity.Warning,
+  linterFunction: 'allowedFields',
+  linterParams: [
+    [
+      '$ref',
+      'title',
+      'multipleOf',
+      'maximum',
+      'exclusiveMaximum',
+      'minimum',
+      'exclusiveMinimum',
+      'maxLength',
+      'minLength',
+      'pattern',
+      'maxItems',
+      'minItems',
+      'uniqueItems',
+      'maxProperties',
+      'minProperties',
+      'required',
+      'enum',
+      'type',
+      'allOf',
+      'oneOf',
+      'anyOf',
+      'not',
+      'items',
+      'properties',
+      'additionalProperties',
+      'description',
+      'format',
+      'default',
+      'nullable',
+      'discriminator',
+      'readOnly',
+      'writeOnly',
+      'xml',
+      'externalDocs',
+      'example',
+      'deprecated',
+    ],
+    'x-',
+  ],
+  marker: 'key',
+  targetSpecs: OpenAPI30,
+};
+
+export default allowedFieldsOpenAPI3_0Lint;
diff --git a/packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2--asyncapi-2.ts b/packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2-0--asyncapi-2.ts
similarity index 84%
rename from packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2--asyncapi-2.ts
rename to packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2-0--asyncapi-2.ts
index 0ec3635ea..26ab4709d 100644
--- a/packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2--asyncapi-2.ts
+++ b/packages/apidom-ls/src/config/common/schema/lint/discriminator--type-openapi-2-0--asyncapi-2.ts
@@ -6,7 +6,7 @@ import { AsyncAPI2 } from '../../../asyncapi/target-specs';
 import { OpenAPI2 } from '../../../openapi/target-specs';
 
 // eslint-disable-next-line @typescript-eslint/naming-convention
-const discriminatorTypeOpenAPI2__AsyncAPI2Lint: LinterMeta = {
+const discriminatorTypeOpenAPI2_0__AsyncAPI2Lint: LinterMeta = {
   code: ApilintCodes.SCHEMA_DISCRIMINATOR,
   source: 'apilint',
   message: "'discriminator' value must be a string",
@@ -19,4 +19,4 @@ const discriminatorTypeOpenAPI2__AsyncAPI2Lint: LinterMeta = {
   targetSpecs: [...AsyncAPI2, ...OpenAPI2],
 };
 
-export default discriminatorTypeOpenAPI2__AsyncAPI2Lint;
+export default discriminatorTypeOpenAPI2_0__AsyncAPI2Lint;
diff --git a/packages/apidom-ls/src/config/common/schema/lint/index.ts b/packages/apidom-ls/src/config/common/schema/lint/index.ts
index ecc3a771d..875450a73 100644
--- a/packages/apidom-ls/src/config/common/schema/lint/index.ts
+++ b/packages/apidom-ls/src/config/common/schema/lint/index.ts
@@ -1,3 +1,5 @@
+import allowedFieldsOpenAPI2_0Lint from './allowed-fields-openapi-2-0';
+import allowedFieldsOpenAPI3_0Lint from './allowed-fields-openapi-3-0';
 import $idFormatURILint from './$id--format-uri';
 import $refValidLint from './$ref--valid';
 import $refNoSiblingsLint from './$ref--no-siblings';
@@ -15,7 +17,7 @@ import containsTypeLint from './contains--type';
 import containsTypeOpenAPI3_1__AsyncAPI2Lint from './contains--type-openapi-3-1--asyncapi-2';
 import descriptionTypeLint from './description--type';
 import discriminatorExistInRequiredLint from './discriminator--exist-in-required';
-import discriminatorTypeOpenAPI2__AsyncAPI2Lint from './discriminator--type-openapi-2--asyncapi-2';
+import discriminatorTypeOpenAPI2_0__AsyncAPI2Lint from './discriminator--type-openapi-2-0--asyncapi-2';
 import discriminatorTypeOpenAPI3Lint from './discriminator--type-openapi-3';
 import elseNonIfLint from './else--non-if';
 import elseTypeLint from './else--type';
@@ -80,6 +82,8 @@ import writeOnlyTypeLint from './write-only--type';
 import exampleDeprecatedLint from './example--deprecated';
 
 const schemaLints = [
+  allowedFieldsOpenAPI2_0Lint,
+  allowedFieldsOpenAPI3_0Lint,
   $idFormatURILint,
   $refValidLint,
   $refNoSiblingsLint,
@@ -97,7 +101,7 @@ const schemaLints = [
   containsTypeOpenAPI3_1__AsyncAPI2Lint,
   descriptionTypeLint,
   discriminatorExistInRequiredLint,
-  discriminatorTypeOpenAPI2__AsyncAPI2Lint,
+  discriminatorTypeOpenAPI2_0__AsyncAPI2Lint,
   discriminatorTypeOpenAPI3Lint,
   elseNonIfLint,
   elseTypeLint,
diff --git a/packages/apidom-ls/test/validate.ts b/packages/apidom-ls/test/validate.ts
index 58502e357..1f39a34bc 100644
--- a/packages/apidom-ls/test/validate.ts
+++ b/packages/apidom-ls/test/validate.ts
@@ -3750,7 +3750,6 @@ describe('apidom-ls-validate', function () {
         source: 'apilint',
       },
     ];
-    console.log(JSON.stringify(result, null, 2));
     assert.deepEqual(result, expected as Diagnostic[]);
 
     languageService.terminate();