diff --git a/.travis.yml b/.travis.yml
index 6257b0f..d4e2673 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ before_script:
   - export PATH=`pwd`/nim-0.13.0/bin:$PATH
 
 script:
-  - nim c -d:ssl -r package_scanner.nim
+  - nim c -d:ssl -r package_scanner.nim && node ./validate_json.js
 
 notifications:
   email: false # noisy
diff --git a/validate_json.js b/validate_json.js
new file mode 100644
index 0000000..e9d1bb4
--- /dev/null
+++ b/validate_json.js
@@ -0,0 +1,2 @@
+var fs = require('fs');
+JSON.parse(fs.readFileSync('packages.json', 'utf8'));