diff --git a/types/ndn-js/blob.d.ts b/types/ndn-js/blob.d.ts
new file mode 100644
index 0000000000..8a84e66b58
--- /dev/null
+++ b/types/ndn-js/blob.d.ts
@@ -0,0 +1,23 @@
+export class Blob {
+    constructor(value?: Blob);
+    constructor(value: Buffer, copy?: boolean);
+    constructor(value: number[]);
+    constructor(value: string);
+
+    size(): number;
+    buf(): Buffer;
+    isNull(): boolean;
+    toHex(): string;
+    toString(): string;
+    equals(other: Blob): boolean;
+}
+
+export class SignedBlob extends Blob {
+    constructor();
+    constructor(value: Blob|Buffer|number[], signedPortionBeginOffset: number, signedPortionEndOffset: number);
+
+    signedSize(): number;
+    signedBuf(): Buffer;
+    getSignedPortionBeginOffset(): number;
+    getSignedPortionEndOffset(): number;
+}
diff --git a/types/ndn-js/index.d.ts b/types/ndn-js/index.d.ts
index da75f56e6c..c1dbeb6a76 100644
--- a/types/ndn-js/index.d.ts
+++ b/types/ndn-js/index.d.ts
@@ -1,3 +1,4 @@
 export as namespace ndn;
+export * from "./blob";
 export * from "./face";
 export * from "./transport";
diff --git a/types/ndn-js/ndn-js-tests.ts b/types/ndn-js/ndn-js-tests.ts
index 2364a6e377..ceeb00effe 100644
--- a/types/ndn-js/ndn-js-tests.ts
+++ b/types/ndn-js/ndn-js-tests.ts
@@ -1,7 +1,31 @@
+/// <reference types="node"/>
 import ndn = require("ndn-js");
 
-let face = new ndn.Face();
-face = new ndn.Face({host: 'hobo.cs.arizona.edu', port: 6363});
-face = new ndn.Face(new ndn.TcpTransport(), new ndn.TcpTransport.ConnectionInfo("hobo.cs.arizona.edu", 9696));
-face = new ndn.Face(new ndn.UnixTransport(), new ndn.UnixTransport.ConnectionInfo("/run/nfd.sock"));
-face = new ndn.Face(new ndn.WebSocketTransport(), new ndn.WebSocketTransport.ConnectionInfo("hobo.cs.arizona.edu", 9696));
+function testBlob() {
+    let blob = new ndn.Blob();
+    blob = new ndn.Blob(blob);
+    blob = new ndn.Blob(Buffer.alloc(4));
+    blob = new ndn.Blob("str");
+
+    let n: number = blob.size();
+    let buf: Buffer = blob.buf();
+    let b: boolean = blob.equals(blob);
+    let s: string = blob.toHex();
+    s = blob.toString();
+    b = blob.isNull();
+
+    let sb = new ndn.SignedBlob();
+    sb = new ndn.SignedBlob(sb, 20, 40);
+    n = sb.signedSize();
+    buf = sb.signedBuf();
+    n = sb.getSignedPortionBeginOffset();
+    n = sb.getSignedPortionEndOffset();
+}
+
+function testFaceTransport() {
+    let face = new ndn.Face();
+    face = new ndn.Face({host: 'hobo.cs.arizona.edu', port: 6363});
+    face = new ndn.Face(new ndn.TcpTransport(), new ndn.TcpTransport.ConnectionInfo("hobo.cs.arizona.edu", 9696));
+    face = new ndn.Face(new ndn.UnixTransport(), new ndn.UnixTransport.ConnectionInfo("/run/nfd.sock"));
+    face = new ndn.Face(new ndn.WebSocketTransport(), new ndn.WebSocketTransport.ConnectionInfo("hobo.cs.arizona.edu", 9696));
+}