diff --git a/Sources/tart/VMConfig.swift b/Sources/tart/VMConfig.swift
index 8af82c7..26cb6eb 100644
--- a/Sources/tart/VMConfig.swift
+++ b/Sources/tart/VMConfig.swift
@@ -28,7 +28,9 @@ struct VMConfig: Encodable, Decodable {
     }
     
     func save(toURL: URL) throws {
-        try JSONEncoder().encode(self).write(to: toURL)
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = .prettyPrinted
+        try encoder.encode(self).write(to: toURL)
     }
     
     init(from decoder: Decoder) throws {