diff --git a/lint-json.js b/lint-json.js
new file mode 100644
index 0000000..90b402a
--- /dev/null
+++ b/lint-json.js
@@ -0,0 +1,39 @@
+const osmBoundarySources = require('./osmBoundarySources.json')
+const zoneCfg = require('./timezones.json')
+
+let numErrors = 0
+
+const sourcesUsage = {}
+Object.keys(osmBoundarySources).forEach(source => {
+  sourcesUsage[source] = false
+})
+
+Object.keys(zoneCfg).forEach(zone => {
+  zoneCfg[zone].forEach(operation => {
+    if (operation.source === 'overpass') {
+      // check if source is defined
+      if (!osmBoundarySources[operation.id]) {
+        numErrors++
+
+        console.error(`No osmBoundarySources config found for entry: ${operation.id}`)
+      } else {
+        sourcesUsage[operation.id] = true
+      }
+    }
+  })
+})
+
+// check for sources not used in timezone building
+Object.keys(sourcesUsage).forEach(source => {
+  if (!sourcesUsage[source]) {
+    numErrors++
+    console.error(`osmBoundarySources config "${source}" is never used in timezone boundary building`)
+  }
+})
+
+if (numErrors > 0) {
+  console.error(`${numErrors} errors found`)
+  process.exit(1)
+} else {
+  console.log('No linting errors!')
+}