diff --git a/snark-html/src/main/kotlin/space/kscience/snark/html/SnarkHtmlPlugin.kt b/snark-html/src/main/kotlin/space/kscience/snark/html/SnarkHtmlPlugin.kt
index ec5c23e..2da57c1 100644
--- a/snark-html/src/main/kotlin/space/kscience/snark/html/SnarkHtmlPlugin.kt
+++ b/snark-html/src/main/kotlin/space/kscience/snark/html/SnarkHtmlPlugin.kt
@@ -3,7 +3,6 @@ package space.kscience.snark.html
 import io.ktor.utils.io.core.readBytes
 import space.kscience.dataforge.context.*
 import space.kscience.dataforge.data.DataTree
-import space.kscience.dataforge.io.IOFormat
 import space.kscience.dataforge.io.IOPlugin
 import space.kscience.dataforge.io.IOReader
 import space.kscience.dataforge.io.JsonMetaFormat
@@ -21,7 +20,6 @@ import space.kscience.dataforge.workspace.readDataDirectory
 import space.kscience.snark.SnarkParser
 import java.nio.file.Path
 import kotlin.io.path.extension
-import kotlin.reflect.KClass
 
 /**
  * A plugin used for rendering a [DataTree] as HTML
@@ -91,7 +89,10 @@ public class SnarkHtmlPlugin : AbstractPlugin() {
 }
 
 @OptIn(DFExperimental::class)
-public fun SnarkHtmlPlugin.readDirectory(path: Path): DataTree<Any> = io.readDataDirectory(path, setOf("md","html")) { dataPath, meta ->
+public fun SnarkHtmlPlugin.readDirectory(path: Path): DataTree<Any> = io.readDataDirectory(
+    path,
+    setOf("md", "html", "yaml", "json")
+) { dataPath, meta ->
     val fileExtension = meta[FileData.FILE_EXTENSION_KEY].string ?: dataPath.extension
     val parser: SnarkParser<Any> = parsers.values.filter { parser ->
         fileExtension in parser.fileExtensions
diff --git a/snark-ktor/src/main/kotlin/space/kscience/snark/ktor/extractData.kt b/snark-ktor/src/main/kotlin/space/kscience/snark/ktor/extractData.kt
index d3cdb57..04daf87 100644
--- a/snark-ktor/src/main/kotlin/space/kscience/snark/ktor/extractData.kt
+++ b/snark-ktor/src/main/kotlin/space/kscience/snark/ktor/extractData.kt
@@ -2,10 +2,7 @@ package space.kscience.snark.ktor
 
 import io.ktor.server.application.Application
 import io.ktor.server.application.log
-import space.kscience.dataforge.context.info
-import space.kscience.dataforge.context.logger
-import java.net.URI
-import java.nio.file.FileSystems
+import io.ktor.server.config.tryGetString
 import java.nio.file.Files
 import java.nio.file.Path
 import java.time.LocalDateTime
@@ -43,15 +40,17 @@ private const val BUILD_DATE_FILE = "/buildDate"
 /**
  * Prepare the data cache directory for snark. Clear data if it is outdated.
  * TODO make internal
+ *
+ * @return true if cache is valid and false if it is reset
  */
-fun Application.prepareSnarkDataCacheDirectory(dataPath: Path) {
+fun Application.prepareSnarkDataCacheDirectory(dataPath: Path): Boolean {
 
     // Clear data directory if it is outdated
     val deployDate = dataPath.resolve(DEPLOY_DATE_FILE).takeIf { it.exists() }
         ?.readText()?.let { LocalDateTime.parse(it) }
     val buildDate = javaClass.getResource(BUILD_DATE_FILE)?.readText()?.let { LocalDateTime.parse(it) }
 
-    val inProduction: Boolean = environment.config.propertyOrNull("ktor.environment.production") != null
+    val inProduction: Boolean = environment.config.tryGetString("ktor.environment.production") == "true"
 
     if (inProduction) {
         log.info("Production mode activated")
@@ -59,7 +58,11 @@ fun Application.prepareSnarkDataCacheDirectory(dataPath: Path) {
         log.info("Deploy date: $deployDate")
     }
 
-    if (deployDate != null && buildDate != null && buildDate.isAfter(deployDate)) {
+    if (!dataPath.exists()) {
+        dataPath.createDirectories()
+        dataPath.resolve(DEPLOY_DATE_FILE).writeText(LocalDateTime.now().toString())
+        return false
+    } else if (deployDate != null && buildDate != null && buildDate.isAfter(deployDate)) {
         log.info("Outdated data. Resetting data directory.")
 
         Files.walk(dataPath)
@@ -69,6 +72,7 @@ fun Application.prepareSnarkDataCacheDirectory(dataPath: Path) {
         //Writing deploy date file
         dataPath.createDirectories()
         dataPath.resolve(DEPLOY_DATE_FILE).writeText(LocalDateTime.now().toString())
+        return false
 
     } else if (inProduction && deployDate == null && buildDate != null) {
         val date = LocalDateTime.now().toString()
@@ -76,5 +80,8 @@ fun Application.prepareSnarkDataCacheDirectory(dataPath: Path) {
         //Writing deploy date in production mode if it does not exist
         dataPath.createDirectories()
         dataPath.resolve(DEPLOY_DATE_FILE).writeText(date)
+        return false
+    } else {
+        return true
     }
 }
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