Merge pull request #1 from vigneshkb7/card-type

Card type validation

README.md

@@ -29,3 +29,21 @@ const { isEncryptedToken } = require("card-validator-utils");
 isEncryptedToken('42424242F242R24242424242F24242424242424C424X')
 
 ```
+
+`detectCardType` function to detect card type
+
+currently it supports
+
+1. diners club
+2. visa
+3. mastercard
+4. american express
+5. discover
+
+```
+const { detectCardType } = require("card-validator-utils");
+
+var cardType = detectCardType(cardNumber);
+console.log(cardType);  // Output: diners club
+
+```

index.js

@@ -14,7 +14,32 @@ function isEncryptedToken(token) {
   return false;
 }
 
+function detectCardType(cardNumber) {
+  // Define regular expressions for different card types
+  var visaPattern = /^4[0-9]{12}(?:[0-9]{3})?$/;
+  var mastercardPattern = /^5[1-5][0-9]{14}$/;
+  var amexPattern = /^3[47][0-9]{13}$/;
+  var discoverPattern = /^6(?:011|5[0-9]{2})[0-9]{12}$/;
+  var dinersClubPattern = /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/;
+
+  // Match the card number against the regular expressions
+  if (dinersClubPattern.test(cardNumber)) {
+    return "diners club";
+  } else if (visaPattern.test(cardNumber)) {
+    return "visa";
+  } else if (mastercardPattern.test(cardNumber)) {
+    return "mastercard";
+  } else if (amexPattern.test(cardNumber)) {
+    return "american express";
+  } else if (discoverPattern.test(cardNumber)) {
+    return "discover";
+  } else {
+    return "invalid";
+  }
+}
+
 module.exports = {
   isCreditCard,
   isEncryptedToken,
+  detectCardType,
 };

package.json

@@ -11,7 +11,17 @@
     "url": "git+https://github.com/vigneshkb7/card-validator-utils.git"
   },
   "keywords": [
-    "card-validator-utils"
+    "card-validator-utils",
+    "credit-card-validator",
+    "card-validate",
+    "card-validator-utils",
+    "card-validator-js",
+    "card-checker",
+    "credit-card-utils",
+    "card-validation-kit",
+    "card-validation-js",
+    "cc-validator",
+    "card-validator-lib"
   ],
   "author": "vignesh balaji",
   "license": "ISC",

test/index.test.js

@@ -1,4 +1,4 @@
-const { isCreditCard, isEncryptedToken } = require("../index");
+const { isCreditCard, isEncryptedToken, detectCardType } = require("../index");
 
 describe("Testing credit card Functionality", () => {
   test("should return true for valida cards", () => {
@@ -12,7 +12,7 @@ describe("Testing credit card Functionality", () => {
   });
 });
 
-describe("Testing credit card Functionality", () => {
+describe("Testing Token Number Functionality", () => {
   test("should return true for valid tokens", () => {
     expect(
       isEncryptedToken("42424242F242R24242424242F24242424242424C424X")
@@ -24,3 +24,18 @@ describe("Testing credit card Functionality", () => {
     );
   });
 });
+
+describe("Testing Card Type", () => {
+  test("should return correct cart type", () => {
+    expect(detectCardType("4532015112890368")).toBe("visa");
+    expect(detectCardType("5555555555554444")).toBe("mastercard");
+    expect(detectCardType("378282246310005")).toBe("american express");
+    expect(detectCardType("6011111111111117")).toBe("discover");
+    expect(detectCardType("6011601160116611")).toBe("discover");
+    expect(detectCardType("6011000990139424")).toBe("discover");
+    expect(detectCardType("30569309025904")).toBe("diners club");
+  });
+  test("should return invalid", () => {
+    expect(detectCardType("45320112890368")).toBe("invalid");
+  });
+});