diff --git a/public/templates/index.tmpl b/public/templates/index.tmpl
index 2de6634..250d056 100644
--- a/public/templates/index.tmpl
+++ b/public/templates/index.tmpl
@@ -79,7 +79,7 @@
           <div class="details">
             <h3>{{tileJSON.name}}</h3>
             <div class="identifier">identifier: {{@key}}{{#if formatted_filesize}} | size: {{formatted_filesize}}{{/if}}</div>
-            <div class="identifier">type: {{#is_vector}}vector{{/is_vector}}{{^is_vector}}raster{{/is_vector}} data {{#if source_type}} | ext: {{source_type}}{{/if}}</div>
+            <div class="identifier">type: {{#is_vector}}vector{{/is_vector}}{{^is_vector}}raster{{/is_vector}} data {{#if sourceType}} | ext: {{sourceType}}{{/if}}</div>
             <p class="services">
               services: <a href="{{public_url}}data/{{@key}}.json{{&../key_query}}">TileJSON</a>
               {{#if xyz_link}}
diff --git a/src/main.js b/src/main.js
index d32f11a..5077ba0 100644
--- a/src/main.js
+++ b/src/main.js
@@ -9,7 +9,7 @@ import axios from 'axios';
 import { server } from './server.js';
 import MBTiles from '@mapbox/mbtiles';
 import { isValidHttpUrl } from './utils.js';
-import { PMtilesOpen, GetPMtilesInfo } from './pmtiles_adapter.js';
+import { openPMtiles, getPMtilesInfo } from './pmtiles_adapter.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -62,7 +62,7 @@ const opts = program.opts();
 
 console.log(`Starting ${packageJson.name} v${packageJson.version}`);
 
-const StartServer = (configPath, config) => {
+const startServer = (configPath, config) => {
   let publicUrl = opts.public_url;
   if (publicUrl && publicUrl.lastIndexOf('/') !== publicUrl.length - 1) {
     publicUrl += '/';
@@ -81,7 +81,7 @@ const StartServer = (configPath, config) => {
   });
 };
 
-const StartWithInputFile = async (inputFile) => {
+const startWithInputFile = async (inputFile) => {
   console.log(`[INFO] Automatically creating config file for ${inputFile}`);
   console.log(`[INFO] Only a basic preview style will be used.`);
   console.log(
@@ -123,8 +123,8 @@ const StartWithInputFile = async (inputFile) => {
 
   const extension = inputFile.split('.').pop().toLowerCase();
   if (extension === 'pmtiles') {
-    let FileOpenInfo = PMtilesOpen(inputFile);
-    const metadata = await GetPMtilesInfo(FileOpenInfo);
+    const fileOpenInfo = openPMtiles(inputFile);
+    const metadata = await getPMtilesInfo(fileOpenInfo);
 
     if (
       metadata.format === 'pbf' &&
@@ -174,7 +174,7 @@ const StartWithInputFile = async (inputFile) => {
       console.log('Run with --verbose to see the config file here.');
     }
 
-    return StartServer(null, config);
+    return startServer(null, config);
   } else {
     if (isValidHttpUrl(inputFile)) {
       console.log(
@@ -235,7 +235,7 @@ const StartWithInputFile = async (inputFile) => {
           console.log('Run with --verbose to see the config file here.');
         }
 
-        return StartServer(null, config);
+        return startServer(null, config);
       });
     });
   }
@@ -251,7 +251,7 @@ fs.stat(path.resolve(opts.config), async (err, stats) => {
     }
 
     if (inputFile) {
-      return StartWithInputFile(inputFile);
+      return startWithInputFile(inputFile);
     } else {
       // try to find in the cwd
       const files = fs.readdirSync(process.cwd());
@@ -266,7 +266,7 @@ fs.stat(path.resolve(opts.config), async (err, stats) => {
       }
       if (inputFile) {
         console.log(`No input file specified, using ${inputFile}`);
-        return StartWithInputFile(inputFile);
+        return startWithInputFile(inputFile);
       } else {
         const url =
           'https://github.com/maptiler/tileserver-gl/releases/download/v1.3.0/zurich_switzerland.mbtiles';
@@ -283,7 +283,7 @@ fs.stat(path.resolve(opts.config), async (err, stats) => {
           });
 
           response.data.pipe(writer);
-          writer.on('finish', () => StartWithInputFile(filename));
+          writer.on('finish', () => startWithInputFile(filename));
           writer.on('error', (err) =>
             console.error(`Error writing file: ${err}`),
           );
@@ -294,6 +294,6 @@ fs.stat(path.resolve(opts.config), async (err, stats) => {
     }
   } else {
     console.log(`Using specified config file from ${opts.config}`);
-    return StartServer(opts.config, null);
+    return startServer(opts.config, null);
   }
 });
diff --git a/src/pmtiles_adapter.js b/src/pmtiles_adapter.js
index a827584..cab3f54 100644
--- a/src/pmtiles_adapter.js
+++ b/src/pmtiles_adapter.js
@@ -11,7 +11,7 @@ class PMTilesFileSource {
   }
   async getBytes(offset, length) {
     const buffer = Buffer.alloc(length);
-    await ReadFileBytes(this.fd, buffer, offset);
+    await readFileBytes(this.fd, buffer, offset);
     const ab = buffer.buffer.slice(
       buffer.byteOffset,
       buffer.byteOffset + buffer.byteLength,
@@ -26,7 +26,7 @@ class PMTilesFileSource {
  * @param buffer
  * @param offset
  */
-async function ReadFileBytes(fd, buffer, offset) {
+async function readFileBytes(fd, buffer, offset) {
   return new Promise((resolve, reject) => {
     fs.read(fd, buffer, 0, buffer.length, offset, (err) => {
       if (err) {
@@ -41,7 +41,7 @@ async function ReadFileBytes(fd, buffer, offset) {
  *
  * @param FilePath
  */
-export function PMtilesOpen(FilePath) {
+export function openPMtiles(FilePath) {
   let pmtiles = undefined;
 
   if (isValidHttpUrl(FilePath)) {
@@ -59,12 +59,12 @@ export function PMtilesOpen(FilePath) {
  *
  * @param pmtiles
  */
-export async function GetPMtilesInfo(pmtiles) {
+export async function getPMtilesInfo(pmtiles) {
   const header = await pmtiles.getHeader();
   const metadata = await pmtiles.getMetadata();
 
   //Add missing metadata from header
-  metadata['format'] = GetPmtilesTileType(header.tileType).type;
+  metadata['format'] = getPmtilesTileType(header.tileType).type;
   metadata['minzoom'] = header.minZoom;
   metadata['maxzoom'] = header.maxZoom;
 
@@ -103,23 +103,23 @@ export async function GetPMtilesInfo(pmtiles) {
  * @param x
  * @param y
  */
-export async function GetPMtilesTile(pmtiles, z, x, y) {
+export async function getPMtilesTile(pmtiles, z, x, y) {
   const header = await pmtiles.getHeader();
-  const TileType = GetPmtilesTileType(header.tileType);
+  const tileType = getPmtilesTileType(header.tileType);
   let zxyTile = await pmtiles.getZxy(z, x, y);
   if (zxyTile && zxyTile.data) {
     zxyTile = Buffer.from(zxyTile.data);
   } else {
     zxyTile = undefined;
   }
-  return { data: zxyTile, header: TileType.header };
+  return { data: zxyTile, header: tileType.header };
 }
 
 /**
  *
  * @param typenum
  */
-function GetPmtilesTileType(typenum) {
+function getPmtilesTileType(typenum) {
   let head = {};
   let tileType;
   switch (typenum) {
diff --git a/src/serve_data.js b/src/serve_data.js
index 0221369..4a95b1f 100644
--- a/src/serve_data.js
+++ b/src/serve_data.js
@@ -12,9 +12,9 @@ import { VectorTile } from '@mapbox/vector-tile';
 
 import { getTileUrls, isValidHttpUrl, fixTileJSONCenter } from './utils.js';
 import {
-  PMtilesOpen,
-  GetPMtilesInfo,
-  GetPMtilesTile,
+  openPMtiles,
+  getPMtilesInfo,
+  getPMtilesTile,
 } from './pmtiles_adapter.js';
 
 export const serve_data = {
@@ -53,8 +53,8 @@ export const serve_data = {
         ) {
           return res.status(404).send('Out of bounds');
         }
-        if (item.source_type === 'pmtiles') {
-          let tileinfo = await GetPMtilesTile(item.source, z, x, y);
+        if (item.sourceType === 'pmtiles') {
+          let tileinfo = await getPMtilesTile(item.source, z, x, y);
           if (tileinfo == undefined || tileinfo.data == undefined) {
             return res.status(404).send('Not found');
           } else {
@@ -99,7 +99,7 @@ export const serve_data = {
 
             return res.status(200).send(data);
           }
-        } else if (item.source_type === 'mbtiles') {
+        } else if (item.sourceType === 'mbtiles') {
           item.source.getTile(z, x, y, (err, data, headers) => {
             let isGzipped;
             if (err) {
@@ -223,11 +223,11 @@ export const serve_data = {
     }
 
     let source;
-    let source_type;
+    let sourceType;
     if (inputType === 'pmtiles') {
-      source = PMtilesOpen(inputFile);
-      source_type = 'pmtiles';
-      const metadata = await GetPMtilesInfo(source);
+      source = openPMtiles(inputFile);
+      sourceType = 'pmtiles';
+      const metadata = await getPMtilesInfo(source);
 
       tileJSON['name'] = id;
       tileJSON['format'] = 'pbf';
@@ -245,7 +245,7 @@ export const serve_data = {
         tileJSON = options.dataDecoratorFunc(id, 'tilejson', tileJSON);
       }
     } else if (inputType === 'mbtiles') {
-      source_type = 'mbtiles';
+      sourceType = 'mbtiles';
       const sourceInfoPromise = new Promise((resolve, reject) => {
         source = new MBTiles(inputFile + '?mode=ro', (err) => {
           if (err) {
@@ -285,7 +285,7 @@ export const serve_data = {
       tileJSON,
       publicUrl,
       source,
-      source_type,
+      sourceType,
     };
   },
 };
diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index 4ff0e8b..2a82804 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -25,9 +25,9 @@ import {
   fixTileJSONCenter,
 } from './utils.js';
 import {
-  PMtilesOpen,
-  GetPMtilesInfo,
-  GetPMtilesTile,
+  openPMtiles,
+  getPMtilesInfo,
+  getPMtilesTile,
 } from './pmtiles_adapter.js';
 import { renderOverlay, renderWatermark, renderAttribution } from './render.js';
 
@@ -398,7 +398,7 @@ const respondImage = (
   if (mode === 'tile' && tileMargin === 0) {
     pool = item.map.renderers[scale];
   } else {
-    pool = item.map.renderers_static[scale];
+    pool = item.map.renderersStatic[scale];
   }
   pool.acquire((err, renderer) => {
     const mlglZ = Math.max(0, z - 1);
@@ -471,14 +471,14 @@ const respondImage = (
         image.resize(width * scale, height * scale);
       }
 
-      const composite_array = [];
+      const composites = [];
       if (overlay) {
-        composite_array.push({ input: overlay });
+        composites.push({ input: overlay });
       }
       if (item.watermark) {
         const canvas = renderWatermark(width, height, scale, item.watermark);
 
-        composite_array.push({ input: canvas.toBuffer() });
+        composites.push({ input: canvas.toBuffer() });
       }
 
       if (mode === 'static' && item.staticAttributionText) {
@@ -489,11 +489,11 @@ const respondImage = (
           item.staticAttributionText,
         );
 
-        composite_array.push({ input: canvas.toBuffer() });
+        composites.push({ input: canvas.toBuffer() });
       }
 
-      if (composite_array.length > 0) {
-        image.composite(composite_array);
+      if (composites.length > 0) {
+        image.composite(composites);
       }
 
       const formatQuality = (options.formatQuality || {})[format];
@@ -847,9 +847,9 @@ export const serve_rendered = {
   add: async (options, repo, params, id, publicUrl, dataResolver) => {
     const map = {
       renderers: [],
-      renderers_static: [],
+      renderersStatic: [],
       sources: {},
-      source_types: {},
+      sourceTypes: {},
     };
 
     let styleJSON;
@@ -888,7 +888,7 @@ export const serve_rendered = {
               const parts = req.url.split('/');
               const sourceId = parts[2];
               const source = map.sources[sourceId];
-              const source_type = map.source_types[sourceId];
+              const sourceType = map.sourceTypes[sourceId];
               const sourceInfo = styleJSON.sources[sourceId];
 
               const z = parts[3] | 0;
@@ -896,8 +896,8 @@ export const serve_rendered = {
               const y = parts[5].split('.')[0] | 0;
               const format = parts[5].split('.')[1];
 
-              if (source_type === 'pmtiles') {
-                let tileinfo = await GetPMtilesTile(source, z, x, y);
+              if (sourceType === 'pmtiles') {
+                let tileinfo = await getPMtilesTile(source, z, x, y);
                 let data = tileinfo.data;
                 let headers = tileinfo.header;
                 if (data == undefined) {
@@ -931,7 +931,7 @@ export const serve_rendered = {
 
                   callback(null, response);
                 }
-              } else if (source_type === 'mbtiles') {
+              } else if (sourceType === 'mbtiles') {
                 source.getTile(z, x, y, (err, data, headers) => {
                   if (err) {
                     if (options.verbose)
@@ -1092,7 +1092,7 @@ export const serve_rendered = {
 
     const queue = [];
     for (const name of Object.keys(styleJSON.sources)) {
-      let source_type;
+      let sourceType;
       let source = styleJSON.sources[name];
       let url = source.url;
       if (
@@ -1113,10 +1113,10 @@ export const serve_rendered = {
         }
 
         let inputFile;
-        const DataInfo = dataResolver(dataId);
-        if (DataInfo.inputFile) {
-          inputFile = DataInfo.inputFile;
-          source_type = DataInfo.fileType;
+        const dataInfo = dataResolver(dataId);
+        if (dataInfo.inputFile) {
+          inputFile = dataInfo.inputFile;
+          sourceType = dataInfo.fileType;
         } else {
           console.error(`ERROR: data "${inputFile}" not found!`);
           process.exit(1);
@@ -1129,10 +1129,10 @@ export const serve_rendered = {
           }
         }
 
-        if (source_type === 'pmtiles') {
-          map.sources[name] = PMtilesOpen(inputFile);
-          map.source_types[name] = 'pmtiles';
-          const metadata = await GetPMtilesInfo(map.sources[name]);
+        if (sourceType === 'pmtiles') {
+          map.sources[name] = openPMtiles(inputFile);
+          map.sourceTypes[name] = 'pmtiles';
+          const metadata = await getPMtilesInfo(map.sources[name]);
 
           if (!repoobj.dataProjWGStoInternalWGS && metadata.proj4) {
             // how to do this for multiple sources with different proj4 defs?
@@ -1177,7 +1177,7 @@ export const serve_rendered = {
                     console.error(err);
                     return;
                   }
-                  map.source_types[name] = 'mbtiles';
+                  map.sourceTypes[name] = 'mbtiles';
 
                   if (!repoobj.dataProjWGStoInternalWGS && info.proj4) {
                     // how to do this for multiple sources with different proj4 defs?
@@ -1236,7 +1236,7 @@ export const serve_rendered = {
       const minPoolSize = minPoolSizes[i];
       const maxPoolSize = Math.max(minPoolSize, maxPoolSizes[j]);
       map.renderers[s] = createPool(s, 'tile', minPoolSize, maxPoolSize);
-      map.renderers_static[s] = createPool(
+      map.renderersStatic[s] = createPool(
         s,
         'static',
         minPoolSize,
@@ -1250,7 +1250,7 @@ export const serve_rendered = {
       item.map.renderers.forEach((pool) => {
         pool.close();
       });
-      item.map.renderers_static.forEach((pool) => {
+      item.map.renderersStatic.forEach((pool) => {
         pool.close();
       });
     }
diff --git a/src/server.js b/src/server.js
index 6b10644..2b382a0 100644
--- a/src/server.js
+++ b/src/server.js
@@ -179,15 +179,15 @@ function start(opts) {
         item,
         id,
         opts.publicUrl,
-        (StyleSourceId, protocol) => {
+        (styleSourceId, protocol) => {
           let dataItemId;
           for (const id of Object.keys(data)) {
-            if (id === StyleSourceId) {
+            if (id === styleSourceId) {
               // Style id was found in data ids, return that id
               dataItemId = id;
             } else {
               const fileType = Object.keys(data[id])[0];
-              if (data[id][fileType] === StyleSourceId) {
+              if (data[id][fileType] === styleSourceId) {
                 // Style id was found in data filename, return the id that filename belong to
                 dataItemId = id;
               }
@@ -199,21 +199,21 @@ function start(opts) {
           } else {
             if (!allowMoreData) {
               console.log(
-                `ERROR: style "${item.style}" using unknown file "${StyleSourceId}"! Skipping...`,
+                `ERROR: style "${item.style}" using unknown file "${styleSourceId}"! Skipping...`,
               );
               return undefined;
             } else {
               let id =
-                StyleSourceId.substr(0, StyleSourceId.lastIndexOf('.')) ||
-                StyleSourceId;
-              if (isValidHttpUrl(StyleSourceId)) {
+                styleSourceId.substr(0, styleSourceId.lastIndexOf('.')) ||
+                styleSourceId;
+              if (isValidHttpUrl(styleSourceId)) {
                 id =
-                  fnv1a(StyleSourceId) + '_' + id.replace(/^.*\/(.*)$/, '$1');
+                  fnv1a(styleSourceId) + '_' + id.replace(/^.*\/(.*)$/, '$1');
               }
               while (data[id]) id += '_'; //if the data source id already exists, add a "_" untill it doesn't
               //Add the new data source to the data array.
               data[id] = {
-                [protocol]: StyleSourceId,
+                [protocol]: styleSourceId,
               };
 
               return id;
@@ -236,15 +236,15 @@ function start(opts) {
             item,
             id,
             opts.publicUrl,
-            (StyleSourceId) => {
+            function dataResolver(styleSourceId) {
               let fileType;
               let inputFile;
               for (const id of Object.keys(data)) {
                 fileType = Object.keys(data[id])[0];
-                if (StyleSourceId == id) {
+                if (styleSourceId == id) {
                   inputFile = data[id][fileType];
                   break;
-                } else if (data[id][fileType] == StyleSourceId) {
+                } else if (data[id][fileType] == styleSourceId) {
                   inputFile = data[id][fileType];
                   break;
                 }