diff --git a/example/node/example1.js b/example/node/example1.js
index 0bcd37e0..f7ca00f9 100644
--- a/example/node/example1.js
+++ b/example/node/example1.js
@@ -33,7 +33,7 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
 	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
diff --git a/example/node/example2.js b/example/node/example2.js
index be387d88..a72c3acf 100644
--- a/example/node/example2.js
+++ b/example/node/example2.js
@@ -36,8 +36,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example2.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
 
diff --git a/example/node/example3.js b/example/node/example3.js
index 2721eb1a..dbd80590 100644
--- a/example/node/example3.js
+++ b/example/node/example3.js
@@ -40,8 +40,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example3.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
 
diff --git a/example/node/example4.js b/example/node/example4.js
index cca38332..aec89dd7 100644
--- a/example/node/example4.js
+++ b/example/node/example4.js
@@ -33,8 +33,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example4.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
 
diff --git a/example/node/example5.js b/example/node/example5.js
index f79f9585..763e4077 100644
--- a/example/node/example5.js
+++ b/example/node/example5.js
@@ -33,8 +33,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example5.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
 
diff --git a/example/node/example6.js b/example/node/example6.js
index 7919d69a..43952ff1 100644
--- a/example/node/example6.js
+++ b/example/node/example6.js
@@ -33,8 +33,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example6.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }
 
diff --git a/example/node/example7.js b/example/node/example7.js
index 3b5f67ee..b1d2146e 100644
--- a/example/node/example7.js
+++ b/example/node/example7.js
@@ -33,8 +33,8 @@ if (typeof(userId) !== 'string' || userId.length === 0) {
 	process.exit();
 }
 
-if (typeof(userId) !== 'string' || userId.length === 0) {
-	console.error('A context identifier must be specified. Usage example: "node example7.js user-123 barchart"');
+if (typeof(contextId) !== 'string' || contextId.length === 0) {
+	console.error('A context identifier must be specified. Usage example: "node example1.js user-123 barchart"');
 	process.exit();
 }