diff --git a/extensions/ql-vscode/gulpfile.ts/deploy.ts b/extensions/ql-vscode/gulpfile.ts/deploy.ts
index 97491eb93..f713fdc88 100644
--- a/extensions/ql-vscode/gulpfile.ts/deploy.ts
+++ b/extensions/ql-vscode/gulpfile.ts/deploy.ts
@@ -15,7 +15,8 @@ const packageFiles = [
   'snippets.json',
   'media',
   'node_modules',
-  'out'
+  'out',
+  'workspace-databases-schema.json'
 ];
 
 async function copyPackage(sourcePath: string, destPath: string): Promise<void> {
diff --git a/extensions/ql-vscode/package.json b/extensions/ql-vscode/package.json
index 5e685d9df..686d686b0 100644
--- a/extensions/ql-vscode/package.json
+++ b/extensions/ql-vscode/package.json
@@ -84,6 +84,12 @@
         "editor.wordBasedSuggestions": false
       }
     },
+    "jsonValidation": [
+      {
+        "fileMatch": "workspace-databases.json",
+        "url": "./workspace-databases-schema.json"
+      }
+    ],
     "languages": [
       {
         "id": "ql",
diff --git a/extensions/ql-vscode/src/databases/db-config-store.ts b/extensions/ql-vscode/src/databases/db-config-store.ts
index 2056e0d0c..fd47247dd 100644
--- a/extensions/ql-vscode/src/databases/db-config-store.ts
+++ b/extensions/ql-vscode/src/databases/db-config-store.ts
@@ -12,6 +12,7 @@ export class DbConfigStore extends DisposableObject {
 
   public constructor(workspaceStoragePath: string) {
     super();
+
     this.configPath = path.join(workspaceStoragePath, 'workspace-databases.json');
 
     this.config = this.createEmptyConfig();
diff --git a/extensions/ql-vscode/workspace-databases-schema.json b/extensions/ql-vscode/workspace-databases-schema.json
new file mode 100644
index 000000000..513c25cc2
--- /dev/null
+++ b/extensions/ql-vscode/workspace-databases-schema.json
@@ -0,0 +1,49 @@
+{
+  "type": "object",
+  "properties": {
+    "$schema": {
+      "type": "string"
+    },
+    "remote": {
+      "type": "object",
+      "properties": {
+        "repositoryLists": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "properties": {
+              "name": {
+                "type": "string"
+              },
+              "repositories": {
+                "type": "array",
+                "items": {
+                  "type": "string",
+                  "pattern": "^[a-zA-Z0-9-_\\.]+/[a-zA-Z0-9-_\\.]+$"
+                }
+              }
+            },
+            "required": ["name", "repositories"],
+            "additionalProperties": false
+          }
+        },
+        "owners": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "pattern": "^[a-zA-Z0-9-_\\.]+$"
+          }
+        },
+        "repositories": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "pattern": "^[a-zA-Z0-9-_\\.]+/[a-zA-Z0-9-_\\.]+$"
+          }
+        }
+      },
+      "required": ["repositoryLists", "owners", "repositories"],
+      "additionalProperties": false
+    }
+  }
+}