diff --git a/src/create_flyer.sh b/src/create_flyer.sh
index 16357c2..97d6cfe 100755
--- a/src/create_flyer.sh
+++ b/src/create_flyer.sh
@@ -1,6 +1,17 @@
 #!/bin/bash
 
-set -e
+set -euo pipefail
+
+require_cmd() {
+  command -v "$1" >/dev/null 2>&1 || {
+    echo "Error: required command '$1' not found" >&2
+    exit 1
+  }
+}
+
+for cmd in jq node javascript-obfuscator html-minifier-terser; do
+  require_cmd "$cmd"
+done
 
 CONFIG_PATH="src/config.json"
 FROM_PDF=""
@@ -32,9 +43,6 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
-# Ensure jq is installed
-command -v jq >/dev/null 2>&1 || { echo "jq is required" >&2; exit 1; }
-
 # Helper function to update config
 update_config_interactive() {
   read -rp "Name: " name
diff --git a/src/obfuscate_index.sh b/src/obfuscate_index.sh
index efff80b..0e73187 100755
--- a/src/obfuscate_index.sh
+++ b/src/obfuscate_index.sh
@@ -1,5 +1,18 @@
 #!/bin/bash
 
+set -euo pipefail
+
+require_cmd() {
+  command -v "$1" >/dev/null 2>&1 || {
+    echo "Error: required command '$1' not found" >&2
+    exit 1
+  }
+}
+
+for cmd in javascript-obfuscator html-minifier-terser node; do
+  require_cmd "$cmd"
+done
+
 # Input and output file names
 input_file="index-master.html"
 output_file="index.html"
diff --git a/src/obfuscate_nostr.sh b/src/obfuscate_nostr.sh
index ed574f3..a0d0a53 100755
--- a/src/obfuscate_nostr.sh
+++ b/src/obfuscate_nostr.sh
@@ -1,5 +1,18 @@
 #!/bin/bash
 
+set -euo pipefail
+
+require_cmd() {
+  command -v "$1" >/dev/null 2>&1 || {
+    echo "Error: required command '$1' not found" >&2
+    exit 1
+  }
+}
+
+for cmd in javascript-obfuscator html-minifier-terser node; do
+  require_cmd "$cmd"
+done
+
 # Input and output file names
 input_file="nostr-master.html"
 output_file="nostr.html"