Merge pull request #24 from kbariotis/serialize-json

add JSON serialization

lib/CustomError.ts

@@ -23,4 +23,35 @@ export default class CustomError extends Error {
       this.stack = new Error(message).stack;
     }
   }
+
+  toJSON() {
+    const jsonStructure: {
+      message: string;
+      statusCode: number;
+      errorCode: number;
+      name: string;
+      stack?: string;
+      originalError?: {
+        message: string;
+        name: string;
+        stack?: string;
+      };
+    } = {
+      message: this.message,
+      statusCode: this.statusCode,
+      errorCode: this.errorCode,
+      name: this.name,
+      stack: this.stack,
+    };
+
+    if (this.originalError) {
+      jsonStructure.originalError = {
+        name: this.originalError.name,
+        message: this.originalError.message,
+        stack: this.originalError.stack,
+      };
+    }
+
+    return jsonStructure;
+  }
 }

tests/CustomError.spec.ts

@@ -38,6 +38,12 @@ try {
   // The response error code should have been set
   assert.strictEqual(err.statusCode, 400);
 
-  // The customer error code should have been set
+  // Serializes JSON structure
   assert.strictEqual(err.errorCode, 4000);
+  assert.strictEqual(err.toJSON().message, "It went bad!");
+  assert.strictEqual(err.toJSON().statusCode, 400);
+  assert.strictEqual(err.toJSON().errorCode, 4000);
+  assert.strictEqual(err.toJSON().name, "CustomError");
+  assert.notStrictEqual(err.toJSON().originalError, undefined);
+  assert.notStrictEqual(err.toJSON().stack, undefined);
 }