diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..fcd8348
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,560 @@
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+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+      "dev": true
+    },
+    "minimatch": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "dev": true,
+      "requires": {
+        "brace-expansion": "^1.1.7"
+      }
+    },
+    "minimist": {
+      "version": "0.0.8",
+      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
+      "dev": true
+    },
+    "mkdirp": {
+      "version": "0.5.1",
+      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "dev": true,
+      "requires": {
+        "minimist": "0.0.8"
+      }
+    },
+    "mocha": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-4.1.0.tgz",
+      "integrity": "sha512-0RVnjg1HJsXY2YFDoTNzcc1NKhYuXKRrBAG2gDygmJJA136Cs2QlRliZG1mA0ap7cuaT30mw16luAeln+4RiNA==",
+      "dev": true,
+      "requires": {
+        "browser-stdout": "1.3.0",
+        "commander": "2.11.0",
+        "debug": "3.1.0",
+        "diff": "3.3.1",
+        "escape-string-regexp": "1.0.5",
+        "glob": "7.1.2",
+        "growl": "1.10.3",
+        "he": "1.1.1",
+        "mkdirp": "0.5.1",
+        "supports-color": "4.4.0"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
+    },
+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
+      "requires": {
+        "wrappy": "1"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "http://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
+    },
+    "pathval": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "dev": true
+    },
+    "supports-color": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
+      "integrity": "sha512-rKC3+DyXWgK0ZLKwmRsrkyHVZAjNkfzeehuFWdGGcqGDTZFH73+RH6S/RDAAxl9GusSjZSUWYLmT9N5pzXFOXQ==",
+      "dev": true,
+      "requires": {
+        "has-flag": "^2.0.0"
+      }
+    },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 6c78a24..abb927f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "configparser",
-  "version": "0.2.6",
+  "version": "0.2.7",
   "description": "A basic config parser language based off the Python ConfigParser module.",
   "main": "src/configparser.js",
   "scripts": {
@@ -13,12 +13,12 @@
   "author": "Zach Perkitny",
   "license": "ISC",
   "keywords": [
-      "config",
-      "parser",
-      "configparser",
-      "config-parser",
-      "ini",
-      "node"
+    "config",
+    "parser",
+    "configparser",
+    "config-parser",
+    "ini",
+    "node"
   ],
   "dependencies": {},
   "devDependencies": {
diff --git a/src/configparser.js b/src/configparser.js
index 7f3f2e7..dabfe4c 100644
--- a/src/configparser.js
+++ b/src/configparser.js
@@ -34,9 +34,52 @@ const readFileAsync = util.promisify(fs.readFile);
 const writeFileAsync = util.promisify(fs.writeFile);
 
 /**
+ * A constructor function for creating a `ConfigParser` instance.
+ * The `ConfigParser` is designed to parse configuration files and manage their sections.
+ *
  * @constructor
+ * @param {Object} [options] - Optional configuration options.
+ * @param {'none' | 'lower' | 'upper'} [options.transform='none'] - Specifies the type of transformation to apply to the file's content.
+ *        - `'none'`: No transformation (default).
+ *        - `'lower'`: Converts all text to lowercase.
+ *        - `'upper'`: Converts all text to uppercase.
+ * @param {Function|null} [options.onInvalidLine=null] - A callback to handle invalid lines during parsing.
+ *        - The callback receives a single argument: an object with the following properties:
+ *          - `opt.line` {string}: The content of the invalid line.
+ *          - `opt.lineNumber` {number}: The number of the invalid line in the file.
+ *          - `opt.file` {string}: The file path being parsed.
  */
-function ConfigParser() {
+function ConfigParser(options) {
+    options = options || {};
+
+    /**
+     * @private
+     * @type {string|null}
+     * The file to be parsed. Initially set to null.
+     */
+    this._file = null;
+
+    /**
+     * @private
+     * @type {'none' | 'lower' | 'upper'}
+     * Transformation type to be applied. Defaults to 'none' if not specified in options.
+     */
+    this._transform = options.transform || 'none';
+
+    /**
+     * @private
+     * @type {Function|null}
+     * A callback function to handle invalid lines, or null if no handler is provided.
+     * The callback should accept an object with properties: `line`, `lineNumber`, and `file`.
+     */
+    this._onInvalidLine = options.onInvalidLine || null;
+
+    /**
+     * @private
+     * @type {Object}
+     * An object to store sections parsed from the configuration file.
+     * Each key represents a section name, and its value contains the section's data.
+     */
     this._sections = {};
 }
 
@@ -99,6 +142,7 @@ ConfigParser.prototype.hasKey = function (section, key) {
  * @param {string|Buffer|int} file - Filename or File Descriptor
  */
 ConfigParser.prototype.read = function(file) {
+    this._file = file;
     const lines = fs.readFileSync(file)
         .toString('utf8')
         .split(LINE_BOUNDARY);
@@ -110,6 +154,7 @@ ConfigParser.prototype.read = function(file) {
  * @param {string|Buffer|int} file - Filename or File Descriptor
  */
 ConfigParser.prototype.readAsync = async function(file) {
+    this._file = file;
     const lines = (await readFileAsync(file))
         .toString('utf8')
         .split(LINE_BOUNDARY);
@@ -232,23 +277,43 @@ ConfigParser.prototype.writeAsync = function(file) {
 }
 
 function parseLines(lines) {
+    lines = lines.map(v => v.replace(/^\s+/,''));
+    const file = this._file;
+    let onInvalidLine = typeof this._onInvalidLine === 'function' ? this._onInvalidLine : null;
+    let transform = this._transform;
     let curSec = null;
+    let transformKey = function(key){
+        if (key === void 0 || key === null) return;
+        if (!transform){
+            return key;
+        }
+        if (transform === 'upper') {
+            return key.toUpperCase();
+        }
+        else if (transform === 'lower') {
+            return key.toLowerCase();
+        } else {
+            return key;
+        }
+    };
+
     lines.forEach((line, lineNumber) => {
         if(!line || line.match(COMMENT)) return;
         let res = SECTION.exec(line);
-        if(res){
+        if(res){ // header
             const header = res[1];
             curSec = {};
-            this._sections[header] = curSec;
-        } else if(!curSec) {
+            this._sections[transformKey(header)] = curSec;
+        } else if(!curSec) { // no section
             throw new errors.MissingSectionHeaderError(file, lineNumber, line);
-        } else {
+        } else { // regular line
             res = KEY.exec(line);
-            if(res){
+            if(res && res[1] !== '' && line[0] !== '='){
                 const key = res[1];
-                curSec[key] = res[2];
+                curSec[transformKey(key)] = res[2];
             } else {
-                throw new errors.ParseError(file, lineNumber, line);
+                if (onInvalidLine) onInvalidLine({file, lineNumber, line});
+                else throw new errors.ParseError(file || '', lineNumber, line);
             }
         }
     });
diff --git a/test/configparser.js b/test/configparser.js
index a390f65..c45074e 100644
--- a/test/configparser.js
+++ b/test/configparser.js
@@ -2,20 +2,24 @@ const expect = require('chai').expect;
 const ConfigParser = require('../src/configparser');
 
 describe('ConfigParser object', function(){
-    const config = new ConfigParser();
+    const config = new ConfigParser({
+        onInvalidLine: (errorInfo) => {}
+    });
     config.read('test/data/file.ini');
 
-    it('should return all sections in the config file', function(){
-        expect(config.sections()).to.deep.equal([
-            'section1',
-            'section2',
-            'USER',
-            'im running out of ideas',
-            'interpolation',
-            'permissive_section:headers%!?',
-            'more_complex_interpolation'
-        ]);
-    });
+	it('should return all sections in the config file', function () {
+		expect(config.sections()).to.deep.equal([
+			'section1',
+			'section2',
+			'USER',
+			'im running out of ideas',
+			'interpolation',
+			'permissive_section:headers%!?',
+			'more_complex_interpolation',
+            'camelCaseSection',
+            'section_with_errors'
+		]);
+	});
 
     it('should indicate if a section is present in a config file', function(){
         expect(config.hasSection('section1')).to.equal(true);
@@ -80,4 +84,51 @@ describe('ConfigParser object', function(){
         expect(config.removeSection('new-section')).to.equal(true);
         expect(config.hasSection('new-section')).to.equal(false);
     });
-});
\ No newline at end of file
+
+
+	describe('Transform configuration keys', function(){
+		describe('upper', () => {
+            const config = new ConfigParser({transform: 'upper', onInvalidLine: () => {}});
+            before(function(){
+                config.read('test/data/file.ini');
+            });
+
+            it('should should upper keys', function () {
+                expect(config.sections().indexOf('CAMELCASESECTION')).to.be.eql(7)
+            })
+        })
+        describe('lower', () => {
+            const config = new ConfigParser({transform: 'lower', onInvalidLine: () => {}});
+            before(function(){
+                config.read('test/data/file.ini');
+            });
+
+            it('should should upper keys', function () {
+                expect(config.sections().indexOf('camelcasesection')).to.be.eql(7)
+            })
+        })
+	})
+    describe('Errors', () => {
+        describe('No "onInvalidLine" cb.', () => {
+            it('should throw if invalid line is detected', () => {
+                expect(() => {
+                    let f = new ConfigParser({})
+                    f.read('test/data/file.ini');
+                }).to.throw();
+            })
+        })
+        describe('No "onInvalidLine" cb.', () => {
+            it('should throw if invalid line is detected', async () => {
+                let count = 0;
+                let f = new ConfigParser({onInvalidLine: (data) => count++});
+                f.read('test/data/file.ini');
+                expect(count).to.be.eql(2);
+            })
+        })
+        // it('should report error', () => {
+        //     console.log(config.keys('section_with_errors'))
+        //     expect()
+        // })
+    })
+
+});
diff --git a/test/data/file.ini b/test/data/file.ini
index 6d2314c..3008d2a 100644
--- a/test/data/file.ini
+++ b/test/data/file.ini
@@ -35,4 +35,15 @@ root=home
 next_dir=%(its_nested)s/zach/%(my_folder)s
 its_nested=nested
 my_folder=documents
-file=mytextfile.txt
\ No newline at end of file
+file=mytextfile.txt
+
+
+[camelCaseSection]
+camelCaseKey=1
+OtherKey=2
+#comment here
+
+[section_with_errors]
+b==aaa
+aaa
+=ffff