diff --git a/modules/i3s/src/index.ts b/modules/i3s/src/index.ts
index 78ea82b813..9f5930a34f 100644
--- a/modules/i3s/src/index.ts
+++ b/modules/i3s/src/index.ts
@@ -29,7 +29,6 @@ export type {
   Histogram,
   ValueCount,
   BuildingSceneSublayer,
-  DATA_TYPE,
   OperationalLayer,
   TextureSetDefinitionFormats
 } from './types';
diff --git a/modules/i3s/src/lib/parsers/constants.ts b/modules/i3s/src/lib/parsers/constants.ts
index 7ff2377c82..102c690b5d 100644
--- a/modules/i3s/src/lib/parsers/constants.ts
+++ b/modules/i3s/src/lib/parsers/constants.ts
@@ -1,17 +1,16 @@
 import GL from '@luma.gl/constants';
-import {DATA_TYPE} from '../../types';
 
 export function getConstructorForDataFormat(dataType: string) {
   switch (dataType) {
-    case DATA_TYPE.UInt8:
+    case 'UInt8':
       return Uint8Array;
-    case DATA_TYPE.UInt16:
+    case 'UInt16':
       return Uint16Array;
-    case DATA_TYPE.UInt32:
+    case 'UInt32':
       return Uint32Array;
-    case DATA_TYPE.Float32:
+    case 'Float32':
       return Float32Array;
-    case DATA_TYPE.UInt64:
+    case 'UInt64':
       return Float64Array;
     default:
       throw new Error(`parse i3s tile content: unknown type of data: ${dataType}`);
@@ -32,18 +31,18 @@ export const GL_TYPE_MAP: {[key: string]: number} = {
  */
 export function sizeOf(dataType: string): number {
   switch (dataType) {
-    case DATA_TYPE.UInt8:
+    case 'UInt8':
       return 1;
-    case DATA_TYPE.UInt16:
-    case DATA_TYPE.Int16:
+    case 'UInt16':
+    case 'Int16':
       return 2;
-    case DATA_TYPE.UInt32:
-    case DATA_TYPE.Int32:
-    case DATA_TYPE.Float32:
+    case 'UInt32':
+    case 'Int32':
+    case 'Float32':
       return 4;
-    case DATA_TYPE.UInt64:
-    case DATA_TYPE.Int64:
-    case DATA_TYPE.Float64:
+    case 'UInt64':
+    case 'Int64':
+    case 'Float64':
       return 8;
     default:
       throw new Error(`parse i3s tile content: unknown size of data: ${dataType}`);
diff --git a/modules/i3s/src/lib/parsers/parse-slpk/slpk-archieve.ts b/modules/i3s/src/lib/parsers/parse-slpk/slpk-archieve.ts
index e588e8dd09..a84dacf1a1 100644
--- a/modules/i3s/src/lib/parsers/parse-slpk/slpk-archieve.ts
+++ b/modules/i3s/src/lib/parsers/parse-slpk/slpk-archieve.ts
@@ -26,7 +26,7 @@ const PATH_DESCRIPTIONS: {test: RegExp; extensions: string[]}[] = [
     extensions: ['.json.gz']
   },
   {
-    test: /^nodes\/\d+$/,
+    test: /^nodes\/(\d+|root)$/,
     extensions: ['/3dNodeIndexDocument.json.gz']
   },
   {
diff --git a/modules/i3s/src/types.ts b/modules/i3s/src/types.ts
index ef74a7ce54..f0e840ffb7 100644
--- a/modules/i3s/src/types.ts
+++ b/modules/i3s/src/types.ts
@@ -2,18 +2,6 @@ import type {Matrix4, Quaternion, Vector3} from '@math.gl/core';
 import type {TypedArray, MeshAttribute, TextureLevel} from '@loaders.gl/schema';
 import {Tile3D, Tileset3D} from '@loaders.gl/tiles';
 
-export enum DATA_TYPE {
-  UInt8 = 'UInt8',
-  UInt16 = 'UInt16',
-  UInt32 = 'UInt32',
-  UInt64 = 'UInt64',
-  Int16 = 'Int16',
-  Int32 = 'Int32',
-  Int64 = 'Int64',
-  Float32 = 'Float32',
-  Float64 = 'Float64'
-}
-
 export type COLOR = [number, number, number, number];
 
 /**
@@ -690,20 +678,24 @@ type Domain = {
  * spec - https://github.com/Esri/i3s-spec/blob/master/docs/1.8/store.cmn.md
  */
 type Store = {
-  id: string | number;
+  id?: string | number;
   profile: string;
   version: number | string;
-  resourcePattern: string[];
-  rootNode: string;
-  extent: number[];
-  indexCRS: string;
-  vertexCRS: string;
-  normalReferenceFrame: string;
-  attributeEncoding: string;
-  textureEncoding: string[];
-  lodType: string;
-  lodModel: string;
+  resourcePattern?: string[];
+  rootNode?: string;
+  extent?: number[];
+  indexCRS?: string;
+  vertexCRS?: string;
+  normalReferenceFrame?: string;
+  lodType?: string;
+  lodModel?: string;
   defaultGeometrySchema: DefaultGeometrySchema;
+  nidEncoding?: string;
+  textureEncoding?: string[];
+  featureEncoding?: string;
+  geometryEncoding?: string;
+  attributeEncoding?: string;
+  indexingScheme?: string;
 };
 /**
  * Spec - https://github.com/Esri/i3s-spec/blob/master/docs/1.8/defaultGeometrySchema.cmn.md
@@ -726,15 +718,15 @@ type DefaultGeometrySchema = {
 export type HeaderAttribute = {
   property: HeaderAttributeProperty.vertexCount | HeaderAttributeProperty.featureCount | string;
   type:
-    | DATA_TYPE.UInt8
-    | DATA_TYPE.UInt16
-    | DATA_TYPE.UInt32
-    | DATA_TYPE.UInt64
-    | DATA_TYPE.Int16
-    | DATA_TYPE.Int32
-    | DATA_TYPE.Int64
-    | DATA_TYPE.Float32
-    | DATA_TYPE.Float64;
+    | 'UInt8'
+    | 'UInt16'
+    | 'UInt32'
+    | 'UInt64'
+    | 'Int16'
+    | 'Int32'
+    | 'Int64'
+    | 'Float32'
+    | 'Float64';
 };
 export enum HeaderAttributeProperty {
   vertexCount = 'vertexCount',
@@ -749,14 +741,7 @@ export type VertexAttribute = {
 };
 export type GeometryAttribute = {
   byteOffset?: number;
-  valueType:
-    | DATA_TYPE.UInt8
-    | DATA_TYPE.UInt16
-    | DATA_TYPE.Int16
-    | DATA_TYPE.Int32
-    | DATA_TYPE.Int64
-    | DATA_TYPE.Float32
-    | DATA_TYPE.Float64;
+  valueType: 'UInt8' | 'UInt16' | 'Int16' | 'Int32' | 'Int64' | 'Float32' | 'Float64';
   valuesPerElement: number;
 };
 export type I3SMeshAttributes = {
diff --git a/modules/tile-converter/src/i3s-server/app.ts b/modules/tile-converter/src/i3s-server/app.ts
index 510a986bf5..24753af161 100644
--- a/modules/tile-converter/src/i3s-server/app.ts
+++ b/modules/tile-converter/src/i3s-server/app.ts
@@ -2,10 +2,14 @@ import express from 'express';
 import path from 'path';
 import logger from 'morgan';
 import cors from 'cors';
+import {loadArchive} from './controllers/slpk-controller';
+
+const I3S_LAYER_PATH = process.env.I3sLayerPath || ''; // eslint-disable-line no-process-env, no-undef
+const FULL_LAYER_PATH = path.join(process.cwd(), I3S_LAYER_PATH); // eslint-disable-line no-undef
+loadArchive(FULL_LAYER_PATH);
 
 const indexRouter = require('./routes/index');
 
-const I3S_LAYER_PATH = process.env.I3sLayerPath || ''; // eslint-disable-line no-process-env, no-undef
 export const app = express();
 
 app.use(logger('dev'));
diff --git a/modules/tile-converter/src/i3s-server/bin/www.ts b/modules/tile-converter/src/i3s-server/bin/www.ts
index 9485d1a2a4..ad98d2ec35 100755
--- a/modules/tile-converter/src/i3s-server/bin/www.ts
+++ b/modules/tile-converter/src/i3s-server/bin/www.ts
@@ -1,29 +1,25 @@
 #!/usr/bin/env node
 
-/**
- * Module dependencies.
- */
-
 import {app} from '../app';
-import debugFactory from 'debug';
 import https from 'https';
 import http from 'http';
 import fs from 'fs';
 import path from 'path';
+import {formErrorHandler, formListeningHandler, normalizePort} from '../utils/server-utils';
 
-const debug = debugFactory('i3s-server:server');
-
-/**
- * Get port from environment and store in Express.
- */
-
-const httpPort = normalizePort(process.env.PORT || '80'); // eslint-disable-line no-process-env, no-undef
-const httpsPort = normalizePort(process.env.HTTPS_PORT || '443'); // eslint-disable-line no-process-env, no-undef
-
-/**
- * Create HTTP server.
- */
+/** Get port from environment and store in Express. */
+const httpPort = normalizePort(process.env.PORT || '80');
+if (httpPort === false) {
+  console.error(`Incorrect HTTP port`);
+  process.exit(1);
+}
+const httpsPort = normalizePort(process.env.HTTPS_PORT || '443');
+if (httpsPort === false) {
+  console.error(`Incorrect HTTPs port`);
+  process.exit(1);
+}
 
+/** Create HTTP server. */
 const options = {
   key: fs.readFileSync(path.join(__dirname, '../certs/key.pem')),
   cert: fs.readFileSync(path.join(__dirname, '../certs/cert.pem'))
@@ -32,10 +28,7 @@ const options = {
 const httpServer = http.createServer(app);
 const httpsServer = https.createServer(options, app);
 
-/**
- * Listen on provided port, on all network interfaces.
- */
-
+/** Listen on provided port, on all network interfaces. */
 httpServer.listen(httpPort);
 httpServer.on('error', formErrorHandler(httpPort));
 httpServer.on('listening', formListeningHandler(httpServer));
@@ -43,62 +36,3 @@ httpServer.on('listening', formListeningHandler(httpServer));
 httpsServer.listen(httpsPort);
 httpsServer.on('error', formErrorHandler(httpsPort));
 httpsServer.on('listening', formListeningHandler(httpsServer));
-
-/**
- * Normalize a port into a number, string, or false.
- */
-
-function normalizePort(val) {
-  const chkPort = parseInt(val, 10);
-
-  if (isNaN(chkPort)) {
-    // named pipe
-    return val;
-  }
-
-  if (chkPort >= 0) {
-    // port number
-    return chkPort;
-  }
-
-  return false;
-}
-
-/**
- * Event listener for HTTP/HTTPS server "error" event.
- */
-
-function formErrorHandler(optionalPort) {
-  return function onError(error) {
-    if (error.syscall !== 'listen') {
-      throw error;
-    }
-
-    const bind = typeof global.port === 'string' ? `Pipe ${optionalPort}` : `Port ${optionalPort}`;
-
-    // handle specific listen errors with friendly messages
-    switch (error.code) {
-      case 'EACCES':
-        console.error(`${bind} requires elevated privileges`); // eslint-disable-line no-console, no-undef
-        process.exit(1); // eslint-disable-line no-process-exit, no-undef
-        break;
-      case 'EADDRINUSE':
-        console.error(`${bind} is already in use`); // eslint-disable-line no-console, no-undef
-        process.exit(1); // eslint-disable-line no-process-exit, no-undef
-        break;
-      default:
-        throw error;
-    }
-  };
-}
-
-/**
- * Event listener for HTTP/HTTPS server "listening" event.
- */
-function formListeningHandler(optionalServer) {
-  return function onListening() {
-    const addr = optionalServer.address();
-    const bind = typeof addr === 'string' ? `pipe ${addr}` : `port ${addr.port}`;
-    debug(`Listening on ${bind}`);
-  };
-}
diff --git a/modules/tile-converter/src/i3s-server/controllers/index-controller.ts b/modules/tile-converter/src/i3s-server/controllers/index-controller.ts
index 61d9d150d8..fdc4ade617 100644
--- a/modules/tile-converter/src/i3s-server/controllers/index-controller.ts
+++ b/modules/tile-converter/src/i3s-server/controllers/index-controller.ts
@@ -3,11 +3,16 @@ import fs from 'fs';
 
 const {promises} = fs;
 
-const I3S_LAYER_PATH = process.env.I3sLayerPath || ''; // eslint-disable-line no-process-env, no-undef
-const FULL_LAYER_PATH = path.join(process.cwd(), I3S_LAYER_PATH); // eslint-disable-line no-undef
+const I3S_LAYER_PATH = process.env.I3sLayerPath || '';
 
-export async function getFileNameByUrl(url) {
+/**
+ * Get local file name by input HTTP URL
+ * @param url - I3S HTTP service url
+ * @returns - local file name
+ */
+export async function getFileNameByUrl(url: string): Promise<string | null> {
   const extensions = ['json', 'bin', 'jpg', 'jpeg', 'png', 'bin.dds', 'ktx2'];
+  const FULL_LAYER_PATH = path.join(process.cwd(), I3S_LAYER_PATH);
   for (const ext of extensions) {
     const fileName = `${FULL_LAYER_PATH}${url}/index.${ext}`;
     try {
diff --git a/modules/tile-converter/src/i3s-server/controllers/slpk-controller.ts b/modules/tile-converter/src/i3s-server/controllers/slpk-controller.ts
index 3ae6d0f0e1..679ad70e25 100644
--- a/modules/tile-converter/src/i3s-server/controllers/slpk-controller.ts
+++ b/modules/tile-converter/src/i3s-server/controllers/slpk-controller.ts
@@ -1,22 +1,25 @@
 import '@loaders.gl/polyfills';
 import {parseSLPK} from '@loaders.gl/i3s';
 import {FileHandleProvider} from '@loaders.gl/tile-converter';
-import path from 'path';
 
 let slpkArchive;
 
-const loadArchive = async (fullLayerPath) => {
+/**
+ * Open SLPK file for reading and load HASH file
+ * @param fullLayerPath - full path to SLPK file
+ */
+export const loadArchive = async (fullLayerPath: string): Promise<void> => {
   slpkArchive = await parseSLPK(await FileHandleProvider.from(fullLayerPath));
 };
 
-const I3S_LAYER_PATH = process.env.I3sLayerPath || ''; // eslint-disable-line no-process-env, no-undef
-const FULL_LAYER_PATH = path.join(process.cwd(), I3S_LAYER_PATH); // eslint-disable-line no-undef
-
-loadArchive(FULL_LAYER_PATH);
-
-export async function getFileByUrl(url) {
+/**
+ * Get a file from SLPK
+ * @param url - I3S HTTP URL
+ * @returns  - file content
+ */
+export async function getFileByUrl(url: string) {
   const trimmedPath = /^\/?(.*)\/?$/.exec(url);
-  let uncompressedFile;
+  let uncompressedFile: Buffer | null = null;
   if (trimmedPath) {
     try {
       uncompressedFile = Buffer.from(await slpkArchive.getFile(trimmedPath[1], 'http'));
diff --git a/modules/tile-converter/src/i3s-server/utils/create-scene-server.ts b/modules/tile-converter/src/i3s-server/utils/create-scene-server.ts
index 3110a8c818..40675fe69f 100644
--- a/modules/tile-converter/src/i3s-server/utils/create-scene-server.ts
+++ b/modules/tile-converter/src/i3s-server/utils/create-scene-server.ts
@@ -1,6 +1,13 @@
+import {SceneLayer3D} from '@loaders.gl/i3s';
 import {v4 as uuidv4} from 'uuid';
 
-export const createSceneServer = (name, layer) => {
+/**
+ * Create `/SceneServer` response
+ * @param name - service name, custom user-friendly name of the service
+ * @param layer - I3S layer JSON
+ * @returns reponse JSON for `/SceneServer` route
+ */
+export const createSceneServer = (name: string, layer: SceneLayer3D) => {
   return {
     serviceItemId: uuidv4().replace(/-/gi, ''),
     serviceName: name,
diff --git a/modules/tile-converter/src/i3s-server/utils/server-utils.ts b/modules/tile-converter/src/i3s-server/utils/server-utils.ts
new file mode 100644
index 0000000000..e3b2acbb66
--- /dev/null
+++ b/modules/tile-converter/src/i3s-server/utils/server-utils.ts
@@ -0,0 +1,70 @@
+import type {Server as HttpsServer} from 'https';
+import type {Server as HttpServer} from 'http';
+
+import debugFactory from 'debug';
+const debug = debugFactory('i3s-server:server');
+
+/**
+ * Normalize a port into a number, string, or false.
+ * @param val - port value from env variables
+ * @returns - `number` for port, `string` for a named pipe, or `false` if the port number is not correct
+ */
+export function normalizePort(val: string): number | string | false {
+  const chkPort = parseInt(val, 10);
+
+  if (Number.isNaN(chkPort)) {
+    // named pipe
+    return val;
+  }
+
+  if (chkPort >= 0) {
+    // port number
+    return chkPort;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener creator for HTTP/HTTPS server "error" event.
+ * @param optionalPort - the port/named pipe the server is started on
+ * @return callback to handle server errors
+ */
+export function formErrorHandler(
+  optionalPort: string | number
+): (error: NodeJS.ErrnoException) => void {
+  return function onError(error: NodeJS.ErrnoException) {
+    if (error.syscall !== 'listen') {
+      throw error;
+    }
+
+    const bind = typeof optionalPort === 'string' ? `Pipe ${optionalPort}` : `Port ${optionalPort}`;
+
+    // handle specific listen errors with friendly messages
+    switch (error.code) {
+      case 'EACCES':
+        console.error(`${bind} requires elevated privileges`); // eslint-disable-line no-console, no-undef
+        process.exit(1); // eslint-disable-line no-process-exit, no-undef
+        break;
+      case 'EADDRINUSE':
+        console.error(`${bind} is already in use`); // eslint-disable-line no-console, no-undef
+        process.exit(1); // eslint-disable-line no-process-exit, no-undef
+        break;
+      default:
+        throw error;
+    }
+  };
+}
+
+/**
+ * Event listener for HTTP/HTTPS server "listening" event.
+ * @param optionalServer - http or https NodeJS server
+ * @return callback that is triggered when the server has started
+ */
+export function formListeningHandler(optionalServer: HttpsServer | HttpServer): () => void {
+  return function onListening() {
+    const addr = optionalServer.address();
+    const bind = typeof addr === 'string' ? `pipe ${addr}` : `port ${addr?.port}`;
+    debug(`Listening on ${bind}`);
+  };
+}
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/index.json
new file mode 100644
index 0000000000..58ff5b1405
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/index.json
@@ -0,0 +1 @@
+{"serviceItemId":"82a6203820c740e88bbafb94132f6b03","serviceName":"Frankfurt-md-2","name":"Frankfurt-md-2","currentVersion":10.7,"serviceVersion":"1.8","supportedBindings":["REST"],"layers":[{"version":"{1F518F6A-9621-4476-8194-DD034FF34614}","id":0,"name":"Frankfurt-md-2","href":"./layers/0","layerType":"IntegratedMesh","spatialReference":{"wkid":4326,"latestWkid":4326,"vcsWkid":5773,"latestVcsWkid":5773},"capabilities":["View","Query"],"store":{"id":"{F23F2D74-EE90-4C42-AFF3-56CE04640CE6}","profile":"meshpyramids","version":"1.8","resourcePattern":["3dNodeIndexDocument","Attributes","SharedResource","Geometry"],"rootNode":"./nodes/root","extent":[8.638486093840738,50.10162577927056,8.714439334060673,50.11520548628318],"indexCRS":"http://www.opengis.net/def/crs/EPSG/0/4326","vertexCRS":"http://www.opengis.net/def/crs/EPSG/0/4326","normalReferenceFrame":"east-north-up","attributeEncoding":"application/octet-stream; version=1.6","textureEncoding":["image/jpeg","image/ktx2"],"lodType":"MeshPyramid","lodModel":"node-switching","defaultGeometrySchema":{"geometryType":"triangles","header":[{"property":"vertexCount","type":"UInt32"},{"property":"featureCount","type":"UInt32"}],"topology":"PerAttributeArray","ordering":["position","normal","uv0","color"],"vertexAttributes":{"position":{"valueType":"Float32","valuesPerElement":3},"normal":{"valueType":"Float32","valuesPerElement":3},"uv0":{"valueType":"Float32","valuesPerElement":2},"color":{"valueType":"UInt8","valuesPerElement":4}},"featureAttributeOrder":["id","faceRange"],"featureAttributes":{"id":{"valueType":"UInt64","valuesPerElement":1},"faceRange":{"valueType":"UInt32","valuesPerElement":2}}}},"fullExtent":{"xmin":8.638486093840738,"ymin":50.10162577927056,"xmax":8.714439334060673,"ymax":50.11520548628318,"zmin":-4668.025435449932,"zmax":5048.2198269797045},"heightModelInfo":{"heightModel":"gravity_related_height","vertCRS":"EGM96_Geoid","heightUnit":"meter"},"nodePages":{"nodesPerPage":64,"lodSelectionMetricType":"maxScreenThresholdSQ"},"materialDefinitions":[{"doubleSided":true,"emissiveFactor":[255,255,255],"alphaMode":"opaque","pbrMetallicRoughness":{"roughnessFactor":1,"metallicFactor":1,"baseColorTexture":{"textureSetDefinitionId":0}}}],"textureSetDefinitions":[{"formats":[{"name":"0","format":"jpg"},{"name":"1","format":"ktx2"}]},{"formats":[{"name":"0","format":"jpg"},{"name":"1","format":"ktx2"}],"atlas":true}],"geometryDefinitions":[{"geometryBuffers":[{"offset":8,"position":{"type":"Float32","component":3},"normal":{"type":"Float32","component":3},"uv0":{"type":"Float32","component":2},"color":{"type":"UInt8","component":4},"featureId":{"binding":"per-feature","type":"UInt64","component":1},"faceRange":{"binding":"per-feature","type":"UInt32","component":2}},{"compressedAttributes":{"encoding":"draco","attributes":["position","normal","uv0","color","feature-index"]}}]}],"attributeStorageInfo":[],"fields":[]}]}
\ No newline at end of file
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/index.json
new file mode 100644
index 0000000000..0750502d87
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/index.json
@@ -0,0 +1 @@
+{"version":"{1F518F6A-9621-4476-8194-DD034FF34614}","id":0,"name":"Frankfurt-md-2","href":"./layers/0","layerType":"IntegratedMesh","spatialReference":{"wkid":4326,"latestWkid":4326,"vcsWkid":5773,"latestVcsWkid":5773},"capabilities":["View","Query"],"store":{"id":"{F23F2D74-EE90-4C42-AFF3-56CE04640CE6}","profile":"meshpyramids","version":"1.8","resourcePattern":["3dNodeIndexDocument","Attributes","SharedResource","Geometry"],"rootNode":"./nodes/root","extent":[8.638486093840738,50.10162577927056,8.714439334060673,50.11520548628318],"indexCRS":"http://www.opengis.net/def/crs/EPSG/0/4326","vertexCRS":"http://www.opengis.net/def/crs/EPSG/0/4326","normalReferenceFrame":"east-north-up","attributeEncoding":"application/octet-stream; version=1.6","textureEncoding":["image/jpeg","image/ktx2"],"lodType":"MeshPyramid","lodModel":"node-switching","defaultGeometrySchema":{"geometryType":"triangles","header":[{"property":"vertexCount","type":"UInt32"},{"property":"featureCount","type":"UInt32"}],"topology":"PerAttributeArray","ordering":["position","normal","uv0","color"],"vertexAttributes":{"position":{"valueType":"Float32","valuesPerElement":3},"normal":{"valueType":"Float32","valuesPerElement":3},"uv0":{"valueType":"Float32","valuesPerElement":2},"color":{"valueType":"UInt8","valuesPerElement":4}},"featureAttributeOrder":["id","faceRange"],"featureAttributes":{"id":{"valueType":"UInt64","valuesPerElement":1},"faceRange":{"valueType":"UInt32","valuesPerElement":2}}}},"fullExtent":{"xmin":8.638486093840738,"ymin":50.10162577927056,"xmax":8.714439334060673,"ymax":50.11520548628318,"zmin":-4668.025435449932,"zmax":5048.2198269797045},"heightModelInfo":{"heightModel":"gravity_related_height","vertCRS":"EGM96_Geoid","heightUnit":"meter"},"nodePages":{"nodesPerPage":64,"lodSelectionMetricType":"maxScreenThresholdSQ"},"materialDefinitions":[{"doubleSided":true,"emissiveFactor":[255,255,255],"alphaMode":"opaque","pbrMetallicRoughness":{"roughnessFactor":1,"metallicFactor":1,"baseColorTexture":{"textureSetDefinitionId":0}}}],"textureSetDefinitions":[{"formats":[{"name":"0","format":"jpg"},{"name":"1","format":"ktx2"}]},{"formats":[{"name":"0","format":"jpg"},{"name":"1","format":"ktx2"}],"atlas":true}],"geometryDefinitions":[{"geometryBuffers":[{"offset":8,"position":{"type":"Float32","component":3},"normal":{"type":"Float32","component":3},"uv0":{"type":"Float32","component":2},"color":{"type":"UInt8","component":4},"featureId":{"binding":"per-feature","type":"UInt64","component":1},"faceRange":{"binding":"per-feature","type":"UInt32","component":2}},{"compressedAttributes":{"encoding":"draco","attributes":["position","normal","uv0","color","feature-index"]}}]}],"attributeStorageInfo":[],"fields":[]}
\ No newline at end of file
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodepages/0/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodepages/0/index.json
new file mode 100644
index 0000000000..f908de3a64
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodepages/0/index.json
@@ -0,0 +1 @@
+{"nodes":[{"index":0,"lodThreshold":0,"obb":{"center":[8.676496951388435,50.10841667136257,141.39774178531218],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]},"children":[1]},{"index":1,"obb":{"center":[8.676496951388435,50.108416671362576,141.39774178662847],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]},"lodThreshold":217717.37806230574,"children":[],"mesh":{"geometry":{"definition":0,"resource":1,"vertexCount":15312,"featureCount":1},"attribute":{"resource":1},"material":{"definition":0,"resource":1,"texelCountHint":524288}}}]}
\ No newline at end of file
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/0/index.bin b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/0/index.bin
new file mode 100644
index 0000000000..39930c2449
Binary files /dev/null and b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/0/index.bin differ
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/1/index.bin b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/1/index.bin
new file mode 100644
index 0000000000..06e1051096
Binary files /dev/null and b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/geometries/1/index.bin differ
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/index.json
new file mode 100644
index 0000000000..7d2b60e1eb
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/index.json
@@ -0,0 +1 @@
+{"version":"{9CF428F9-E6D2-47C1-86C7-20589A1510B2}","id":"1","level":1,"mbs":[8.676496951388435,50.108416671362576,141.39774178662847,3243.2640505992454],"obb":{"center":[8.676496951388435,50.108416671362576,141.39774178662847],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]},"lodSelection":[{"metricType":"maxScreenThreshold","maxError":526.503917672968},{"metricType":"maxScreenThresholdSQ","maxError":217717.37806230574}],"children":[],"neighbors":[],"parentNode":{"id":"root","href":"../root","mbs":[8.676496951388435,50.10841667136257,141.39774178531218,3243.2640505992454],"obb":{"center":[8.676496951388435,50.10841667136257,141.39774178531218],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]}},"sharedResource":{"href":"./shared"},"geometryData":[{"href":"./geometries/0"}],"textureData":[{"href":"./textures/0"},{"href":"./textures/1"}]}
\ No newline at end of file
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/shared/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/shared/index.json
new file mode 100644
index 0000000000..5051cb2d18
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/shared/index.json
@@ -0,0 +1 @@
+{"materialDefinitions":{"Mat10":{"name":"standard","type":"standard","params":{"renderMode":"solid","shininess":1,"reflectivity":0,"ambient":[1,1,1],"diffuse":[1,1,1],"specular":[0,0,0],"useVertexColorAlpha":false,"vertexRegions":false,"vertexColors":true}}},"textureDefinitions":{"10":{"encoding":["image/jpeg"],"wrap":["none"],"atlas":false,"uvSet":"uv0","channels":"rgb","images":[{"id":"1170920505658572802","size":1024,"href":["../textures/0"],"length":[2097152]}]}}}
\ No newline at end of file
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/0/index.jpg b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/0/index.jpg
new file mode 100644
index 0000000000..cf7f57c119
Binary files /dev/null and b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/0/index.jpg differ
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/1/index.ktx2 b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/1/index.ktx2
new file mode 100644
index 0000000000..a1f87635f4
Binary files /dev/null and b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/1/textures/1/index.ktx2 differ
diff --git a/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/root/index.json b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/root/index.json
new file mode 100644
index 0000000000..02ec05e642
--- /dev/null
+++ b/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0/nodes/root/index.json
@@ -0,0 +1 @@
+{"version":"{9CF428F9-E6D2-47C1-86C7-20589A1510B2}","id":"root","level":0,"mbs":[8.676496951388435,50.10841667136257,141.39774178531218,3243.2640505992454],"obb":{"center":[8.676496951388435,50.10841667136257,141.39774178531218],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]},"lodSelection":[{"metricType":"maxScreenThresholdSQ","maxError":0},{"metricType":"maxScreenThreshold","maxError":0}],"children":[{"id":"1","href":"../1","obb":{"center":[8.676496951388435,50.108416671362576,141.39774178662847],"halfSize":[2311.620410505966,2062.4371056037326,959.9614393664732],"quaternion":[0.2227952683502938,0.25834836931465127,0.7144546321993598,0.6109373295678506]},"mbs":[8.676496951388435,50.108416671362576,141.39774178662847,3243.2640505992454]}],"parentNode":{}}
\ No newline at end of file
diff --git a/modules/tile-converter/test/i3s-server/controllers/index-controller.spec.ts b/modules/tile-converter/test/i3s-server/controllers/index-controller.spec.ts
new file mode 100644
index 0000000000..7e79f70f7c
--- /dev/null
+++ b/modules/tile-converter/test/i3s-server/controllers/index-controller.spec.ts
@@ -0,0 +1,33 @@
+import test from 'tape-promise/tape';
+import {isBrowser} from '@loaders.gl/core';
+import {getFileNameByUrl} from '../../../src/i3s-server/controllers/index-controller';
+
+const URL_PREFIX =
+  '/modules/tile-converter/test/data/i3s-server/Frankfurt-md-2/SceneServer/layers/0';
+const TEST_CASES = [
+  {input: '', output: 'index.json'},
+  {input: '/nodepages/0', output: 'nodepages/0/index.json'},
+  {input: '/nodes/root', output: 'nodes/root/index.json'},
+  {input: '/nodes/1', output: 'nodes/1/index.json'},
+  {input: '/nodes/1/geometries/0', output: 'nodes/1/geometries/0/index.bin'},
+  {input: '/nodes/1/geometries/1', output: 'nodes/1/geometries/1/index.bin'},
+  {input: '/nodes/1/shared', output: 'nodes/1/shared/index.json'},
+  {input: '/nodes/1/textures/0', output: 'nodes/1/textures/0/index.jpg'},
+  {input: '/nodes/1/textures/1', output: 'nodes/1/textures/1/index.ktx2'}
+];
+
+test('tile-converter(i3s-server)#getFileNameByUrl', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const cwd = process.cwd();
+
+  for (const testCase of TEST_CASES) {
+    const result = await getFileNameByUrl(`${URL_PREFIX}${testCase.input}`);
+    t.equals(result, `${cwd}${URL_PREFIX}/${testCase.output}`);
+  }
+
+  t.end();
+});
diff --git a/modules/tile-converter/test/i3s-server/controllers/slpk-controller.spec.ts b/modules/tile-converter/test/i3s-server/controllers/slpk-controller.spec.ts
new file mode 100644
index 0000000000..324b7783ac
--- /dev/null
+++ b/modules/tile-converter/test/i3s-server/controllers/slpk-controller.spec.ts
@@ -0,0 +1,45 @@
+import test from 'tape-promise/tape';
+import {isBrowser} from '@loaders.gl/core';
+import path from 'path';
+import {getFileByUrl, loadArchive} from '../../../src/i3s-server/controllers/slpk-controller';
+
+const URL_PREFIX = '';
+const SLPK_URL = './modules/i3s/test/data/DA12_subset.slpk';
+const TEST_CASES = [
+  {input: '', output: 4780},
+  {input: 'nodepages/0', output: 16153},
+  {input: 'nodes/root', output: 11550},
+  {input: 'nodes/1', output: 1175},
+  {input: 'nodes/1/geometries/0', output: 25620},
+  {input: 'nodes/1/geometries/1', output: 1767},
+  {input: 'nodes/1/shared', output: 333}
+];
+
+test('tile-converter(i3s-server)#getFileByUrl return null if file is not loaded', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const result = await getFileByUrl('layers/0');
+  t.equals(result, null);
+
+  t.end();
+});
+
+test('tile-converter(i3s-server)#getFileByUrl return files content', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const FULL_LAYER_PATH = path.join(process.cwd(), SLPK_URL); // eslint-disable-line no-undef
+  await loadArchive(FULL_LAYER_PATH);
+
+  for (const testCase of TEST_CASES) {
+    const result = await getFileByUrl(`${URL_PREFIX}${testCase.input}`);
+    t.equals(result?.byteLength, testCase.output);
+  }
+
+  t.end();
+});
diff --git a/modules/tile-converter/test/i3s-server/utils/create-scene-server.spec.ts b/modules/tile-converter/test/i3s-server/utils/create-scene-server.spec.ts
new file mode 100644
index 0000000000..2f4691dc30
--- /dev/null
+++ b/modules/tile-converter/test/i3s-server/utils/create-scene-server.spec.ts
@@ -0,0 +1,164 @@
+import test from 'tape-promise/tape';
+import {isBrowser} from '@loaders.gl/core';
+import {SceneLayer3D} from '@loaders.gl/i3s';
+import {createSceneServer} from '../../../src/i3s-server/utils/create-scene-server';
+
+test('tile-converter(i3s-server)#createSceneServer', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const result = await createSceneServer('Buildings_3D_Multipatch_DA12_Subset', LAYER);
+  t.equals(JSON.stringify(result).length, 4898);
+
+  t.end();
+});
+
+const LAYER: SceneLayer3D = {
+  id: 0,
+  version: 'ECB1F245-BAB6-4CF3-86CE-9CF6047E9239',
+  name: 'Buildings_3D_Multipatch_DA12_Subset',
+  serviceUpdateTimeStamp: {lastUpdate: 1570746568000},
+  href: './layers/0',
+  layerType: '3DObject',
+  spatialReference: {wkid: 4326, latestWkid: 4326, vcsWkid: 5773, latestVcsWkid: 5773},
+  heightModelInfo: {
+    heightModel: 'gravity_related_height',
+    vertCRS: 'EGM96_Geoid',
+    heightUnit: 'meter'
+  },
+  ZFactor: 0.30480060960121924,
+  alias: 'Buildings_3D_Multipatch_DA12_Subset',
+  description: 'Buildings_3D_Multipatch_DA12_Subset',
+  capabilities: ['View', 'Query'],
+  cachedDrawingInfo: {color: false},
+  popupInfo: {
+    title: '{BIN}',
+    mediaInfos: [],
+    fieldInfos: [
+      {fieldName: 'OBJECTID', visible: true, isEditable: false, label: 'OBJECTID'},
+      {fieldName: 'BIN', visible: true, isEditable: true, label: 'BIN'},
+      {fieldName: 'DOITT_ID', visible: true, isEditable: true, label: 'DOITT_ID'},
+      {fieldName: 'SOURCE_ID', visible: true, isEditable: true, label: 'SOURCE_ID'}
+    ],
+    popupElements: [
+      {
+        fieldInfos: [
+          {fieldName: 'OBJECTID', visible: true, isEditable: false, label: 'OBJECTID'},
+          {fieldName: 'BIN', visible: true, isEditable: true, label: 'BIN'},
+          {fieldName: 'DOITT_ID', visible: true, isEditable: true, label: 'DOITT_ID'},
+          {fieldName: 'SOURCE_ID', visible: true, isEditable: true, label: 'SOURCE_ID'}
+        ],
+        type: 'fields'
+      }
+    ],
+    expressionInfos: []
+  },
+  disablePopup: false,
+  fields: [
+    {name: 'OBJECTID', type: 'esriFieldTypeOID', alias: 'OBJECTID'},
+    {name: 'BIN', type: 'esriFieldTypeInteger', alias: 'BIN'},
+    {name: 'DOITT_ID', type: 'esriFieldTypeInteger', alias: 'DOITT_ID'},
+    {name: 'SOURCE_ID', type: 'esriFieldTypeDouble', alias: 'SOURCE_ID'}
+  ],
+  statisticsInfo: [
+    {key: 'f_1', name: 'BIN', href: './statistics/f_1/0'},
+    {key: 'f_2', name: 'DOITT_ID', href: './statistics/f_2/0'},
+    {key: 'f_3', name: 'SOURCE_ID', href: './statistics/f_3/0'}
+  ],
+  attributeStorageInfo: [
+    {
+      key: 'f_0',
+      name: 'OBJECTID',
+      header: [{property: 'count', valueType: 'UInt32'}],
+      ordering: ['attributeValues'],
+      attributeValues: {valueType: 'Oid32', valuesPerElement: 1}
+    },
+    {
+      key: 'f_1',
+      name: 'BIN',
+      header: [{property: 'count', valueType: 'UInt32'}],
+      ordering: ['attributeValues'],
+      attributeValues: {valueType: 'Int32', valuesPerElement: 1}
+    },
+    {
+      key: 'f_2',
+      name: 'DOITT_ID',
+      header: [{property: 'count', valueType: 'UInt32'}],
+      ordering: ['attributeValues'],
+      attributeValues: {valueType: 'Int32', valuesPerElement: 1}
+    },
+    {
+      key: 'f_3',
+      name: 'SOURCE_ID',
+      header: [{property: 'count', valueType: 'UInt32'}],
+      ordering: ['attributeValues'],
+      attributeValues: {valueType: 'Float64', valuesPerElement: 1}
+    }
+  ],
+  store: {
+    id: 'D20A5DA0-623B-4359-880D-474D634F7158',
+    profile: 'meshpyramids',
+    resourcePattern: ['3dNodeIndexDocument', 'Attributes', 'SharedResource', 'Geometry'],
+    rootNode: './nodes/root',
+    extent: [
+      -74.01610254118118348, 40.70883303940371434, -74.00660086904034074, 40.71625626184324886
+    ],
+    indexCRS: 'http://www.opengis.net/def/crs/EPSG/0/4326',
+    vertexCRS: 'http://www.opengis.net/def/crs/EPSG/0/4326',
+    normalReferenceFrame: 'earth-centered',
+    nidEncoding: 'application/vnd.esri.i3s.json+gzip; version=1.7',
+    featureEncoding: 'application/vnd.esri.i3s.json+gzip; version=1.7',
+    geometryEncoding: 'application/octet-stream; version=1.7',
+    attributeEncoding: 'application/octet-stream; version=1.7',
+    lodType: 'MeshPyramid',
+    lodModel: 'node-switching',
+    defaultGeometrySchema: {
+      geometryType: 'triangles',
+      header: [
+        {property: 'vertexCount', type: 'UInt32'},
+        {property: 'featureCount', type: 'UInt32'}
+      ],
+      topology: 'PerAttributeArray',
+      ordering: ['position', 'normal', 'uv0', 'color'],
+      vertexAttributes: {
+        position: {valueType: 'Float32', valuesPerElement: 3},
+        normal: {valueType: 'Float32', valuesPerElement: 3},
+        uv0: {valueType: 'Float32', valuesPerElement: 2},
+        color: {valueType: 'UInt8', valuesPerElement: 4}
+      },
+      featureAttributeOrder: ['id', 'faceRange'],
+      featureAttributes: {
+        id: {valueType: 'UInt64', valuesPerElement: 1},
+        faceRange: {valueType: 'UInt32', valuesPerElement: 2}
+      }
+    },
+    textureEncoding: ['image/jpeg', 'image/vnd-ms.dds'],
+    version: '1.7'
+  },
+  nodePages: {nodesPerPage: 64, lodSelectionMetricType: 'maxScreenThresholdSQ'},
+  materialDefinitions: [],
+  geometryDefinitions: [
+    {
+      topology: 'PerAttributeArray',
+      geometryBuffers: [
+        {
+          offset: 8,
+          position: {type: 'Float32', component: 3, binding: 'per-vertex'},
+          normal: {type: 'Float32', component: 3, binding: 'per-vertex'},
+          uv0: {type: 'Float32', component: 2, binding: 'per-vertex'},
+          color: {type: 'UInt8', component: 4, binding: 'per-vertex'},
+          featureId: {type: 'UInt64', component: 1, binding: 'per-feature'},
+          faceRange: {type: 'UInt32', component: 2, binding: 'per-feature'}
+        },
+        {
+          compressedAttributes: {
+            encoding: 'draco',
+            attributes: ['position', 'uv0', 'color', 'feature-index']
+          }
+        }
+      ]
+    }
+  ]
+};
diff --git a/modules/tile-converter/test/i3s-server/utils/server-utils.spec.ts b/modules/tile-converter/test/i3s-server/utils/server-utils.spec.ts
new file mode 100644
index 0000000000..8da19052b9
--- /dev/null
+++ b/modules/tile-converter/test/i3s-server/utils/server-utils.spec.ts
@@ -0,0 +1,33 @@
+import test from 'tape-promise/tape';
+import {isBrowser} from '@loaders.gl/core';
+import {formErrorHandler, normalizePort} from '../../../src/i3s-server/utils/server-utils';
+
+test('tile-converter(i3s-server)#normalizePort', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const result1 = normalizePort('8080');
+  t.strictEquals(result1, 8080);
+
+  const result2 = normalizePort('\\\\.\\pipe\\PIPE_NAME');
+  t.strictEquals(result2, '\\\\.\\pipe\\PIPE_NAME');
+
+  const result3 = normalizePort('-1000');
+  t.strictEquals(result3, false);
+
+  t.end();
+});
+
+test('tile-converter(i3s-server)#formErrorHandler', async (t) => {
+  if (isBrowser) {
+    t.end();
+    return;
+  }
+
+  const func = formErrorHandler(8080);
+  t.ok(func);
+
+  t.end();
+});
diff --git a/modules/tile-converter/test/index.js b/modules/tile-converter/test/index.js
index d70c66b0ac..021d676e56 100644
--- a/modules/tile-converter/test/index.js
+++ b/modules/tile-converter/test/index.js
@@ -25,3 +25,8 @@ import './3d-tiles-converter/3d-tiles-converter.spec';
 import './3d-tiles-converter/helpers/geometry-attributes.spec';
 
 import './deps-installer/deps-installer.spec';
+
+import './i3s-server/controllers/index-controller.spec';
+import './i3s-server/controllers/slpk-controller.spec';
+import './i3s-server/utils/create-scene-server.spec.ts';
+import './i3s-server/utils/server-utils.spec';