diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb79dd5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+.idea
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 261eeb9..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,201 +0,0 @@
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diff --git a/README.md b/README.md
index bd5464f..adf4144 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,27 @@
 # dynamodb-parser
 A parser and encoder for DynamoDB records
+
+This converts to and from the AWS DynamoDB record format:
+
+### Usage:
+
+### Installation
+```
+const {encodeRecord, parseRecord} = require('dynamodb-parser');
+```
+
+#### Encoding a plain JavaScript object into a DynamoDB record:
+
+```
+const ddbRecord = encodeRecord({foo: 'FOO', bar: {baz: 42}});
+
+// { foo: { S: 'FOO' }, bar: { M: { baz: { N: '42' } } } }
+```
+
+#### Parsing a DynamoDB record into a plain JavaScript object:
+
+```
+const obj = parseRecord(ddbRecord);
+
+// { foo: 'FOO', bar: { baz: 42 } }
+```
\ No newline at end of file
diff --git a/dist/index.js b/dist/index.js
new file mode 100644
index 0000000..4efb20f
--- /dev/null
+++ b/dist/index.js
@@ -0,0 +1,84 @@
+"use strict";
+var __spreadArrays = (this && this.__spreadArrays) || function () {
+    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
+    for (var r = Array(s), k = 0, i = 0; i < il; i++)
+        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
+            r[k] = a[j];
+    return r;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.encodeRecord = exports.encodeAttributeValue = exports.parseRecord = exports.parseAttributeValue = void 0;
+var utils_1 = require("./utils");
+// Note that the order of 'L', 'NULL' and 'M' is important
+var ENCODERS = [
+    encoder('S', utils_1.isString, function (s) { return s; }),
+    encoder('SS', utils_1.every(utils_1.isString), function (ss) { return ss; }),
+    encoder('N', utils_1.isNumber, String),
+    encoder('NS', utils_1.every(utils_1.isNumber), utils_1.map(String)),
+    encoder('B', Buffer.isBuffer, utils_1.toBinary),
+    encoder('BS', utils_1.every(Buffer.isBuffer), utils_1.map(utils_1.toBinary)),
+    encoder('BOOL', utils_1.isBoolean, function (b) { return b; }),
+    encoder('L', Array.isArray, utils_1.map(encodeAttributeValue)),
+    encoder('NULL', function (n) { return n === null; }, function (n) { return true; }),
+    encoder('M', utils_1.isObject, encodeRecord)
+];
+var PARSERS = [
+    parser('B', utils_1.fromBinary),
+    parser('BS', utils_1.map(utils_1.fromBinary)),
+    parser('BOOL', function (b) { return b; }),
+    parser('N', Number),
+    parser('NS', utils_1.map(Number)),
+    parser('S', function (s) { return s; }),
+    parser('SS', function (ss) { return ss; }),
+    parser('NULL', function (b) { return null; }),
+    parser('L', utils_1.map(parseAttributeValue)),
+    parser('M', parseRecord)
+];
+function encoder(type, match, encode) {
+    return {
+        match: match,
+        call: function (v) {
+            var _a;
+            return (_a = {}, _a[type] = encode(v), _a);
+        }
+    };
+}
+function parser(type, parse) {
+    return {
+        match: function (av) { return !!(av === null || av === void 0 ? void 0 : av[type]); },
+        call: function (av) { return parse(av[type]); }
+    };
+}
+function transformValue(transforms, t) {
+    for (var _i = 0, transforms_1 = transforms; _i < transforms_1.length; _i++) {
+        var _a = transforms_1[_i], match = _a.match, call = _a.call;
+        if (match(t)) {
+            return call(t);
+        }
+    }
+    return undefined;
+}
+function transformRecord(transform, record) {
+    return Object.assign.apply(Object, __spreadArrays([{}], Object.entries(record)
+        .map(function (_a) {
+        var _b;
+        var k = _a[0], v = _a[1];
+        return (_b = {}, _b[k] = transform(v), _b);
+    })));
+}
+function parseAttributeValue(av) {
+    return transformValue(PARSERS, av);
+}
+exports.parseAttributeValue = parseAttributeValue;
+function parseRecord(record) {
+    return transformRecord(parseAttributeValue, record);
+}
+exports.parseRecord = parseRecord;
+function encodeAttributeValue(v) {
+    return transformValue(ENCODERS, v);
+}
+exports.encodeAttributeValue = encodeAttributeValue;
+function encodeRecord(record) {
+    return transformRecord(encodeAttributeValue, record);
+}
+exports.encodeRecord = encodeRecord;
diff --git a/dist/utils.js b/dist/utils.js
new file mode 100644
index 0000000..beaf052
--- /dev/null
+++ b/dist/utils.js
@@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isObject = exports.isNumber = exports.isBoolean = exports.isString = exports.type = exports.map = exports.every = exports.fromBinary = exports.toBinary = void 0;
+function toBinary(buf) {
+    return buf.toString('base64');
+}
+exports.toBinary = toBinary;
+function fromBinary(s) {
+    return Buffer.from(s, 'base64');
+}
+exports.fromBinary = fromBinary;
+function every(condition) {
+    return function (items) { return Array.isArray(items) && items.every(condition); };
+}
+exports.every = every;
+function map(transform) {
+    return function (items) { return items.map(transform); };
+}
+exports.map = map;
+function type(type) {
+    return function (t) { return typeof t === type; };
+}
+exports.type = type;
+exports.isString = type('string');
+exports.isBoolean = type('boolean');
+exports.isNumber = type('number');
+exports.isObject = type('object');
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..f459d6b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1530 @@
+{
+  "name": "dynamodb-parser",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
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+      "dev": true
+    },
+    "@types/chai": {
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+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.13.tgz",
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+      "dev": true
+    },
+    "@types/json5": {
+      "version": "0.0.29",
+      "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
+      "integrity": "sha1-7ihweulOEdK4J7y+UnC86n8+ce4=",
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+    "@types/mocha": {
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+      "dev": true
+    },
+    "@types/node": {
+      "version": "14.11.8",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.8.tgz",
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+    },
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+    },
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+      "dev": true,
+      "requires": {
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+      }
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+      "dev": true,
+      "requires": {
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+        "picomatch": "^2.0.4"
+      }
+    },
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+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "array.prototype.map": {
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+      "dev": true,
+      "requires": {
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+        "es-abstract": "^1.17.0-next.1",
+        "es-array-method-boxes-properly": "^1.0.0",
+        "is-string": "^1.0.4"
+      }
+    },
+    "arrify": {
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+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
+    "assertion-error": {
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+      "dev": true
+    },
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+      "requires": {
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+        "commander": "^3.0.2",
+        "js-yaml": "^3.13.1",
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+    "aws-sdk": {
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+        "events": "1.1.1",
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+        "sax": "1.2.1",
+        "url": "0.10.3",
+        "uuid": "3.3.2",
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+          }
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+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
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+      }
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+    "yn": {
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+      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
+      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..2ba048d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "dynamodb-parser",
+  "version": "1.0.0",
+  "description": "A parser and encoder for DynamoDB records",
+  "main": "dist/index.js",
+  "scripts": {
+    "test": "ts-mocha -R spec --recursive test/*",
+    "build": "tsc --build src/tsconfig.json"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/henhal/dynamodb-parser.git"
+  },
+  "keywords": [
+    "DynamoDB",
+    "AWS",
+    "Parser"
+  ],
+  "author": "Henrik Hall",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/henhal/dynamodb-parser/issues"
+  },
+  "homepage": "https://github.com/henhal/dynamodb-parser#readme",
+  "dependencies": {
+    "aws-lambda": "^1.0.6"
+  },
+  "devDependencies": {
+    "@types/aws-lambda": "^8.10.64",
+    "@types/chai": "^4.2.13",
+    "@types/mocha": "^8.0.3",
+    "@types/node": "^14.11.8",
+    "chai": "^4.2.0",
+    "mocha": "^8.1.3",
+    "ts-mocha": "^7.0.0",
+    "typescript": "^4.0.3"
+  }
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..7381fe3
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,102 @@
+import * as Lambda from "aws-lambda";
+import {every, fromBinary, isBoolean, isNumber, isObject, isString, map, toBinary} from "./utils";
+
+type Transform<T, U> = {
+    match: (t: T) => boolean;
+    call: (t: T) => U;
+}
+
+export type DataType =
+    string
+    | string[]
+    | number
+    | number[]
+    | Buffer
+    | Buffer[]
+    | boolean
+    | null
+    | Array<DataType>
+    | {[key: string]: DataType};
+
+// Note that the order of 'L', 'NULL' and 'M' is important
+const ENCODERS: ReadonlyArray<Transform<any, Lambda.AttributeValue>> = [
+    encoder('S', isString, s => s),
+    encoder('SS', every(isString), ss => ss),
+    encoder('N', isNumber, String),
+    encoder('NS', every(isNumber), map(String)),
+    encoder('B', Buffer.isBuffer, toBinary),
+    encoder('BS', every(Buffer.isBuffer), map(toBinary)),
+    encoder('BOOL', isBoolean, b => b),
+    encoder('L', Array.isArray, map(encodeAttributeValue)),
+    encoder('NULL', n => n === null, n => true),
+    encoder('M', isObject, encodeRecord)
+];
+
+const PARSERS: ReadonlyArray<Transform<Lambda.AttributeValue, DataType>> = [
+    parser('B', fromBinary),
+    parser('BS', map(fromBinary)),
+    parser('BOOL', b => b),
+    parser('N', Number),
+    parser('NS', map(Number)),
+    parser('S', s => s),
+    parser('SS', ss => ss),
+    parser('NULL', b => null),
+    parser('L', map(parseAttributeValue)),
+    parser('M', parseRecord)
+];
+
+function encoder<K extends keyof Lambda.AttributeValue, V extends DataType>(
+    type: K,
+    match: (v: V) => boolean,
+    encode: (v: V) => NonNullable<Lambda.AttributeValue[K]>
+): Transform<V, Lambda.AttributeValue> {
+    return {
+        match,
+        call: v => ({[type]: encode(v!)})
+    };
+}
+
+function parser<K extends keyof Lambda.AttributeValue, V>(
+    type: K,
+    parse: (av: NonNullable<Lambda.AttributeValue[K]>) => V
+): Transform<Lambda.AttributeValue, V> {
+    return {
+        match: av => !!av?.[type],
+        call: av => parse(av[type]!)
+    };
+}
+
+function transformValue<T, U>(transforms: ReadonlyArray<Transform<T, U>>, t: T): U {
+    for (const {match, call} of transforms) {
+        if (match(t)) {
+            return call(t);
+        }
+    }
+
+    return undefined as any as U;
+}
+
+function transformRecord<T, U>(transform: (t: T) => U, record: {[key: string]: T}): Record<string, U> {
+    return Object.assign({}, ...Object.entries(record)
+        .map(([k, v]) => ({[k]: transform(v)})));
+}
+
+export function parseAttributeValue(av: Lambda.AttributeValue): DataType {
+    return transformValue(PARSERS, av);
+}
+
+export function parseRecord(record: Record<string, Lambda.AttributeValue>): Record<string, DataType> {
+    return transformRecord(parseAttributeValue, record);
+}
+
+export function encodeAttributeValue(v: DataType): Lambda.AttributeValue {
+    return transformValue(ENCODERS, v);
+}
+
+export function encodeRecord(record: {[key: string]: DataType}): Record<string, Lambda.AttributeValue> {
+    return transformRecord(encodeAttributeValue, record);
+}
+
+
+
+
diff --git a/src/tsconfig.json b/src/tsconfig.json
new file mode 100644
index 0000000..888006d
--- /dev/null
+++ b/src/tsconfig.json
@@ -0,0 +1,69 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "../dist",                      /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 0000000..a70f240
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,24 @@
+export function toBinary(buf: Buffer): string {
+    return buf.toString('base64');
+}
+
+export function fromBinary(s: string): Buffer {
+    return Buffer.from(s, 'base64');
+}
+
+export function every<T>(condition: (item: T) => boolean): (items: T[]) => boolean {
+    return items => Array.isArray(items) && items.every(condition);
+}
+
+export function map<T, U>(transform: (item: T) => U): (items: T[]) => U[] {
+    return items => items.map(transform);
+}
+
+export function type<T>(type: string): (t: T) => boolean {
+    return (t: T) => typeof t === type;
+}
+
+export const isString = type<string>('string');
+export const isBoolean = type<boolean>('boolean');
+export const isNumber = type<number>('number');
+export const isObject = type<any>('object');
\ No newline at end of file
diff --git a/test/data.ts b/test/data.ts
new file mode 100644
index 0000000..ffac0b4
--- /dev/null
+++ b/test/data.ts
@@ -0,0 +1,48 @@
+export const DDB_RECORD = {
+  "str": {
+    "S": "STR"
+  },
+  "arr": {
+    "L": [
+      {
+        "M": {
+          "str": {
+            "S": "STR1"
+          },
+          "n": {
+            "N": "42"
+          }
+        }
+      },
+      {
+        "M": {
+          "str": {
+            "S": "STR2"
+          },
+          "n": {
+            "N": "43"
+          }
+        }
+      }
+    ]
+  },
+  "bool": {
+    "BOOL": true
+  },
+  "nullable": {
+    "NULL": true
+  },
+  "binary": {
+    "B": "yv66vg=="
+  },
+  "missing": undefined
+};
+
+export const RECORD = {
+  str: 'STR',
+  arr: [{str: 'STR1', n: 42}, {str: 'STR2', n: 43}],
+  bool: true,
+  nullable: null,
+  binary: Buffer.from('CAFEBABE', 'hex'),
+  missing: undefined
+};
\ No newline at end of file
diff --git a/test/tests.ts b/test/tests.ts
new file mode 100644
index 0000000..59c1350
--- /dev/null
+++ b/test/tests.ts
@@ -0,0 +1,17 @@
+import {describe} from 'mocha';
+import {expect} from 'chai';
+
+import {encodeRecord, parseRecord} from "../src";
+
+import {RECORD, DDB_RECORD} from './data';
+
+describe('Parser tests', () => {
+    it('Should parse a DynamoDB record', () => {
+        expect(parseRecord(DDB_RECORD as any)).to.eql(RECORD);
+    });
+});
+describe('Encoder tests', () => {
+    it('Should encode an object into a DynamoDB record', () => {
+        expect(encodeRecord(RECORD as any)).to.eql(DDB_RECORD);
+    });
+});
\ No newline at end of file