diff --git a/yarn-project/cli/scripts/generate.sh b/yarn-project/cli/scripts/generate.sh
index dbb508ba5beb..9a701d012857 100755
--- a/yarn-project/cli/scripts/generate.sh
+++ b/yarn-project/cli/scripts/generate.sh
@@ -21,11 +21,44 @@ HEADER
 # Get all network keys from the networks section
 networks=$(yq -o json '.networks | keys' spartan/environments/network-defaults.yml | jq -r '.[]')
 
+# format_value: Converts a YAML value string to a TypeScript literal.
+# Handles scientific notation like "200000e18" by expanding to full integer,
+# since BigInt() cannot parse scientific notation strings.
+format_value() {
+  local val="$1"
+  # Expand integer scientific notation (e.g., 200000e18 -> 200000000000000000000000)
+  if [[ "$val" =~ ^[0-9]+e[0-9]+$ ]]; then
+    python3 -c "
+import re, sys
+m = re.match(r'^(\d+)e(\d+)$', sys.argv[1])
+print(int(m.group(1)) * (10 ** int(m.group(2))))
+" "$val"
+  else
+    echo "$val"
+  fi
+}
+
 for network in $networks; do
   echo "export const ${network}Config = {" >> yarn-project/cli/src/config/generated/networks.ts
-  yq -o json "explode(.) | .networks.$network // {}" spartan/environments/network-defaults.yml | \
-    jq -r "to_entries | .[] | \"  \\(.key): \\(.value | if type == \"string\" then \"'\\(.)'\" else . end),\"" \
-    >> yarn-project/cli/src/config/generated/networks.ts
+
+  # Use yq to iterate entries, converting values to strings to preserve
+  # the original YAML text (avoids float64 precision loss for large numbers).
+  while IFS= read -r line; do
+    key=$(echo "$line" | cut -d':' -f1 | xargs)
+    raw_value=$(echo "$line" | cut -d':' -f2- | xargs)
+
+    formatted=$(format_value "$raw_value")
+
+    # Determine TypeScript formatting: strings get quotes, booleans/numbers are bare
+    if [[ "$formatted" == "true" || "$formatted" == "false" ]]; then
+      echo "  $key: $formatted," >> yarn-project/cli/src/config/generated/networks.ts
+    elif [[ "$formatted" =~ ^-?[0-9]*\.?[0-9]+$ ]]; then
+      echo "  $key: $formatted," >> yarn-project/cli/src/config/generated/networks.ts
+    else
+      echo "  $key: '$formatted'," >> yarn-project/cli/src/config/generated/networks.ts
+    fi
+  done < <(yq "explode(.) | .networks.$network | to_entries | .[] | .key + \": \" + (.value | . tag = \"!!str\")" spartan/environments/network-defaults.yml)
+
   echo "} as const;" >> yarn-project/cli/src/config/generated/networks.ts
   echo "" >> yarn-project/cli/src/config/generated/networks.ts
 done