diff --git a/build.gradle.kts b/build.gradle.kts
index 520c162..d76d14f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
-    kotlin("multiplatform") version "1.8.10"
-    kotlin("plugin.serialization") version "1.8.10"
+    kotlin("multiplatform") version "1.8.20"
+    kotlin("plugin.serialization") version "1.8.20"
     id("org.jetbrains.dokka") version "1.6.0"
     `maven-publish`
 }
@@ -8,7 +8,7 @@ plugins {
 val serialization_version = "1.3.4"
 
 group = "net.sergeych"
-version = "0.0.2-SNAPSHOT"
+version = "0.0.3-SNAPSHOT"
 
 repositories {
     mavenCentral()
@@ -68,6 +68,7 @@ kotlin {
                 // this is actually a bug: we need only the core, but bare core causes strange errors
                 implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")
 //                api("net.sergeych:mp_stools:[1.3.3,)")
+                implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.4.0")
             }
         }
         val commonTest by getting {
diff --git a/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt b/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt
new file mode 100644
index 0000000..4b463a6
--- /dev/null
+++ b/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt
@@ -0,0 +1,34 @@
+package net.sergeych.bintools
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.serializer
+import kotlin.reflect.KType
+import kotlin.reflect.typeOf
+
+/**
+ * Experimental interface for packing and unpacking binary formats.
+ * Initial support intended for BiPack and BOSS to make it fast replaceable.
+ * Also, JSON text version with binary converter is presented by default.
+ */
+interface MotherPacker {
+    fun <T>pack(type: KType, payload: T): ByteArray
+    fun <T>unpack(type: KType,packed: ByteArray): T
+}
+
+inline fun <reified T>MotherPacker.pack(payload: T) = pack(typeOf<T>(), payload)
+inline fun <reified T>MotherPacker.unpack(packed: ByteArray) = unpack<T>(typeOf<T>(), packed)
+
+class JsonPacker : MotherPacker {
+    override fun <T> pack(type: KType, payload: T): ByteArray {
+        return Json.encodeToString(serializer(type), payload).encodeToByteArray()
+    }
+
+    override fun <T> unpack(type: KType, packed: ByteArray): T {
+        return Json.decodeFromString<T>(
+            serializer(type) as KSerializer<T>,
+            packed.decodeToString()
+        )
+    }
+}
+
diff --git a/src/commonMain/kotlin/net.sergeych.bipack/BipackDecoder.kt b/src/commonMain/kotlin/net.sergeych.bipack/BipackDecoder.kt
index a36c062..305394e 100644
--- a/src/commonMain/kotlin/net.sergeych.bipack/BipackDecoder.kt
+++ b/src/commonMain/kotlin/net.sergeych.bipack/BipackDecoder.kt
@@ -1,5 +1,6 @@
 package net.sergeych.bipack
 
+import kotlinx.datetime.Instant
 import kotlinx.serialization.DeserializationStrategy
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.descriptors.SerialDescriptor
@@ -15,6 +16,7 @@ import net.sergeych.bintools.*
  * Decode BiPack format. Note that it relies on [DataSource] so can throw [DataSource.EndOfData]
  * excpetion. Specific frames when used can throw [InvalidFrameException] and its derivatives.e
  */
+@Suppress("UNCHECKED_CAST")
 class BipackDecoder(
     val input: DataSource, var elementsCount: Int = 0, val isCollection: Boolean = false,
     val hasFixedSize: Boolean = false,
@@ -64,12 +66,18 @@ class BipackDecoder(
         return elementIndex++
     }
 
+    override fun <T> decodeSerializableValue(deserializer: DeserializationStrategy<T>): T {
+        return if( deserializer == Instant.serializer() )
+            Instant.fromEpochMilliseconds(decodeLong()) as T
+        else
+            super.decodeSerializableValue(deserializer)
+    }
     override fun decodeSequentially(): Boolean = isCollection
 
     override fun beginStructure(descriptor: SerialDescriptor): CompositeDecoder {
         val isCollection = descriptor.kind == StructureKind.LIST || descriptor.kind == StructureKind.MAP
 
-        var source = if (descriptor.annotations.any { it is CrcProtected })
+        val source = if (descriptor.annotations.any { it is CrcProtected })
             CRC32Source(input)
         else
             input
@@ -119,6 +127,7 @@ class BipackDecoder(
         fun <T> decode(source: DataSource, deserializer: DeserializationStrategy<T>): T =
             BipackDecoder(source).decodeSerializableValue(deserializer)
 
+        @Suppress("unused")
         inline fun <reified T> decode(source: DataSource): T = decode(source, serializer())
         inline fun <reified T> decode(source: ByteArray): T =
             decode(source.toDataSource(), serializer())
diff --git a/src/commonMain/kotlin/net.sergeych.bipack/BipackEncoder.kt b/src/commonMain/kotlin/net.sergeych.bipack/BipackEncoder.kt
index fedda4b..5e0f8eb 100644
--- a/src/commonMain/kotlin/net.sergeych.bipack/BipackEncoder.kt
+++ b/src/commonMain/kotlin/net.sergeych.bipack/BipackEncoder.kt
@@ -1,5 +1,6 @@
 package net.sergeych.bipack
 
+import kotlinx.datetime.Instant
 import kotlinx.serialization.SerializationStrategy
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.AbstractEncoder
@@ -76,6 +77,11 @@ class BipackEncoder(val output: DataSink) : AbstractEncoder() {
         return this
     }
 
+    override fun <T> encodeSerializableValue(serializer: SerializationStrategy<T>, value: T) {
+        if (value is Instant) encodeLong(value.toEpochMilliseconds())
+        else super.encodeSerializableValue(serializer, value)
+    }
+
     override fun beginStructure(descriptor: SerialDescriptor): CompositeEncoder {
         // frame protection should start before anything else:
         val sink = if (descriptor.annotations.any { it is CrcProtected })
@@ -115,6 +121,7 @@ class BipackEncoder(val output: DataSink) : AbstractEncoder() {
             ArrayDataSink().also { encode(serializer, value, it) }.toByteArray()
 
         inline fun <reified T> encode(value: T) = encode(serializer(), value)
+        @Suppress("unused")
         inline fun <reified T> encode(value: T, sink: DataSink) = encode(serializer(), value, sink)
 
     }
diff --git a/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt b/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt
new file mode 100644
index 0000000..3714699
--- /dev/null
+++ b/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt
@@ -0,0 +1,18 @@
+package net.sergeych.bipack
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.serializer
+import net.sergeych.bintools.MotherPacker
+import net.sergeych.bintools.toDataSource
+import kotlin.reflect.KType
+
+class MotherBipack : MotherPacker {
+    override fun <T> pack(type: KType, payload: T): ByteArray {
+        return BipackEncoder.encode(serializer(type), payload)
+    }
+
+    override fun <T> unpack(type: KType, packed: ByteArray): T {
+        return BipackDecoder.decode<T>(packed.toDataSource(),
+            serializer(type) as KSerializer<T>)
+    }
+}
\ No newline at end of file
diff --git a/src/commonTest/kotlin/bintools/JsonPackerTest.kt b/src/commonTest/kotlin/bintools/JsonPackerTest.kt
new file mode 100644
index 0000000..732cf3a
--- /dev/null
+++ b/src/commonTest/kotlin/bintools/JsonPackerTest.kt
@@ -0,0 +1,28 @@
+package bintools
+
+import kotlinx.serialization.Serializable
+import net.sergeych.bintools.JsonPacker
+import net.sergeych.bintools.pack
+import net.sergeych.bintools.unpack
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNull
+
+class JsonPackerTest {
+    @Serializable
+    data class FB1(val foo: Int,val bar: String)
+    @Test
+    fun testPackUnpack() {
+        val mp = JsonPacker()
+        println(mp.pack(mapOf("foo" to 42)).decodeToString())
+        assertEquals("""{"foo":42}""", mp.pack(mapOf("foo" to 42)).decodeToString())
+        val x = mp.unpack<FB1>("""{"foo":42, "bar": "foo"}""".encodeToByteArray())
+        println(x)
+        assertEquals(42, x.foo)
+        assertEquals("foo", x.bar)
+
+        var nx: FB1? = null
+        println(mp.pack(nx).decodeToString())
+        assertNull(mp.unpack<FB1?>("null".encodeToByteArray()))
+    }
+}
\ No newline at end of file
diff --git a/src/commonTest/kotlin/bipack/BipackEncoderTest.kt b/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
index f5f6102..a01f625 100644
--- a/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
+++ b/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
@@ -1,5 +1,7 @@
 package bipack
 
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import net.sergeych.bintools.encodeToHex
@@ -341,4 +343,12 @@ class BipackEncoderTest {
         assertEquals("00 00 00 01 00 00 00 02", BipackEncoder.encode(Foo(0x100000002)).encodeToHex())
 
     }
+
+    @Test
+    fun testInstant() {
+        val x = Clock.System.now()
+//        println( BipackEncoder.encode(x).toDump() )
+        val y = BipackDecoder.decode<Instant>(BipackEncoder.encode(x))
+        assertEquals(x.toEpochMilliseconds(), y.toEpochMilliseconds())
+    }
 }
\ No newline at end of file