diff --git a/.github/workflows/node.js.yml b/.github/workflows/ci.yml
similarity index 96%
rename from .github/workflows/node.js.yml
rename to .github/workflows/ci.yml
index 118d040..0504096 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [20.x]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.gitignore b/.gitignore
index 14c5c55..c2c3f14 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,7 @@
 node_modules/
 package-lock.json
-*.nbt
-*.dat
-*.json
 !package.json
-yarn.lock
\ No newline at end of file
+yarn.lock
+
+# Generated test output
+test/bigtest.json
\ No newline at end of file
diff --git a/.gitpod.yml b/.gitpod.yml
new file mode 100644
index 0000000..5e45c23
--- /dev/null
+++ b/.gitpod.yml
@@ -0,0 +1,6 @@
+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/introduction/learn-gitpod/gitpod-yaml)
+# and commit this file to your remote git repository to share the goodness with others.
+# Learn more from ready-to-use templates: https://www.gitpod.io/docs/introduction/getting-started/quickstart
+tasks:
+  - init: npm install
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8f39819
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 extremeheat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
index 5e162f3..464fd0c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,7 @@
 # nbt-dump
+[![NPM version](https://img.shields.io/npm/v/nbt-dump.svg)](http://npmjs.com/package/nbt-dump)
+[![Build Status](https://github.com/extremeheat/nbt-dump/actions/workflows/ci.yml/badge.svg)](https://github.com/extremeheat/nbt-dump/actions/workflows/)
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/extremeheat/nbt-dump)
 
 A simple command line Node.js tool to read and write NBT files to JSON and back. Supports big, little and little-varint encoding.
 
@@ -23,14 +26,23 @@ Parse an NBT file to JSON:
     nbt-dump <path-to-nbt-file> [out-json-file] [little|big|varint]
 
     nbt-dump level.dat
+        (Dump the contents of level.dat to terminal)
     nbt-dump level.dat to level.json
+        (Dump the contents of level.dat to JSON)
     nbt-dump level.dat as little to level.json
+        (Dump the contents of little endian encoded level.dat to JSON)
 
 Write an JSON file to uncompressed NBT (defaults to big endian):
     nbt-dump write <path-to-json> [out-nbt-file] [little|big|varint]
 
     nbt-dump write level.json to level.dat
     nbt-dump write level.json to level.dat as little
+
+You can also pipe the input to nbt-dump:
+    cat level.dat | nbt-dump
+    cat level.dat | nbt-dump to level.json
+    cat level.json | nbt-dump write
+    cat level.json | nbt-dump write to level.dat
 ```
 
 ### Example
diff --git a/cli.js b/cli.js
new file mode 100755
index 0000000..f6e6490
--- /dev/null
+++ b/cli.js
@@ -0,0 +1,4 @@
+#!/usr/bin/env node
+const { main } = require('./lib')
+const args = process.argv.slice(2)
+main(args, args.join(' '))
diff --git a/index.js b/lib.js
similarity index 72%
rename from index.js
rename to lib.js
index 6143536..6b60dfc 100644
--- a/index.js
+++ b/lib.js
@@ -1,4 +1,3 @@
-#!/usr/bin/env node
 const fs = require('fs')
 const nbt = require('prismarine-nbt')
 
@@ -23,15 +22,29 @@ You can also pipe the input to nbt-dump:
     cat level.json | nbt-dump write to level.dat
 `
 
-async function main(args, argsStr) {
-  if ((args.length == 0 || argsStr.includes('help')) && !!process.stdin.isTTY) {
+// async function isPipedInput (fd = 0) {
+//   return new Promise((resolve, reject) => {
+//     fs.fstat(fd, function (err, stats) {
+//       if (err) {
+//         reject(err)
+//       } else {
+//         resolve(stats.isFIFO())
+//       }
+//     })
+//   })
+// }
+
+async function main (args, argsStr) {
+  if ((args.length === 0 || argsStr.includes('help')) && !!process.stdin.isTTY) {
     console.warn(usage)
     process.exit(1)
   }
-  if (args[0] == 'read') args.shift()
+  if (args[0] === 'read') args.shift()
   let files = []
-  if (!process.stdin.isTTY) files.push(undefined)
-  for (var arg of args) {
+  if (!process.stdin.isTTY && !process.env.CI) {
+    files.push(undefined)
+  }
+  for (const arg of args) {
     if (arg.includes('.')) files.push(arg)
   }
   const getFmt = () => {
@@ -40,10 +53,10 @@ async function main(args, argsStr) {
     if (args.includes('little')) return 'little'
     return undefined
   }
-  if (args[0] == 'write') {
+  if (args[0] === 'write') {
     if (!files.length && args[1]) files.push(args[1])
-    if (files.length == 1) files.push(files[0] || 'stdin' + '.nbt')
-    if (files.length == 2) return (await write(...files, getFmt()))
+    if (files.length === 1) files.push(files[0] || 'stdin' + '.nbt')
+    if (files.length === 2) return (await write(...files, getFmt()))
   } else {
     if (!files.length) files = [args[0], args[0] + '.json']
     return read(files[0], files[1], getFmt())
@@ -53,13 +66,13 @@ async function main(args, argsStr) {
   console.warn(arguments)
 }
 
-async function write(inpf, outf, fmt) {
+async function write (inpf, outf, fmt) {
   console.log(`* Writing JSON from "${inpf || 'stdin'}" to "${outf}" as ${fmt || 'big'} endian`)
 
-  let json;
+  let json
   if (!inpf) {
     const chunks = []
-    for await (const chunk of process.stdin) chunks.push(chunk);
+    for await (const chunk of process.stdin) chunks.push(chunk)
     json = JSON.parse(Buffer.concat(chunks).toString())
   } else {
     json = JSON.parse(fs.readFileSync(inpf))
@@ -74,16 +87,15 @@ async function write(inpf, outf, fmt) {
     console.warn('Failed to write. Make sure that the JSON schema matches the prismarine-nbt ProtoDef schema. See https://github.com/PrismarineJS/prismarine-nbt')
     throw e
   }
-  return
 }
 
-async function read(inpf, outf, fmt) {
+async function read (inpf, outf, fmt) {
   console.log(`* Dumping NBT ${inpf ? 'file "' + inpf + '"' : '"stdin"'} to "${outf || 'stdout'}" as JSON ${fmt ? 'as ' + fmt : ''}`)
 
-  let buffer;
+  let buffer
   if (!inpf) {
     const chunks = []
-    for await (const chunk of process.stdin) chunks.push(chunk);
+    for await (const chunk of process.stdin) chunks.push(chunk)
     buffer = Buffer.concat(chunks)
   } else {
     buffer = await fs.promises.readFile(inpf)
@@ -101,5 +113,4 @@ async function read(inpf, outf, fmt) {
   return true
 }
 
-const args = process.argv.slice(2)
-main(args, args.join(' '))
\ No newline at end of file
+module.exports = { main, write, read }
diff --git a/package.json b/package.json
index b3c9a83..178a3ab 100644
--- a/package.json
+++ b/package.json
@@ -2,12 +2,15 @@
   "name": "nbt-dump",
   "version": "1.0.2",
   "description": "Read and write Minecraft Named Binary Tag files in big, little and little-varint encoding",
-  "main": "index.js",
+  "main": "lib.js",
   "bin": {
-    "nbt-dump": "./index.js"
+    "nbt-dump": "./cli.js"
   },
   "scripts": {
-    "test": "node test.js"
+    "lint": "standard",
+    "fix": "standard --fix",
+    "pretest": "npm run lint",
+    "test": "mocha --bail --exit"
   },
   "repository": {
     "type": "git",
@@ -30,5 +33,10 @@
   "homepage": "https://github.com/extremeheat/nbt-dump#readme",
   "dependencies": {
     "prismarine-nbt": "^2.0.0"
+  },
+  "devDependencies": {
+    "mocha": "^10.3.0",
+    "standard": "^17.1.0",
+    "nbt-dump": "file:."
   }
 }
diff --git a/test.js b/test.js
deleted file mode 100644
index 96e1788..0000000
--- a/test.js
+++ /dev/null
@@ -1,4 +0,0 @@
-const cp = require('child_process')
-
-cp.execSync(`node index.js file.nbt`, { stdio: 'inherit' })
-console.log('✔ Done')
\ No newline at end of file
diff --git a/test/basic.test.js b/test/basic.test.js
new file mode 100644
index 0000000..6e504d5
--- /dev/null
+++ b/test/basic.test.js
@@ -0,0 +1,16 @@
+/* eslint-env mocha */
+/* eslint-disable n/no-path-concat */
+const lib = require('nbt-dump')
+const fs = require('fs')
+const assert = require('assert')
+
+describe('basic tests', () => {
+  it('writes bigtest.nbt to bigtest.json', async () => {
+    const bigNBT = `${__dirname}/bigtest.nbt`
+    const bigJSON = `${__dirname}/bigtest.json`
+    fs.rmSync(bigJSON, { force: true })
+    const args = [bigNBT, bigJSON]
+    await lib.main(args, args.join(' '))
+    assert(fs.existsSync(bigJSON))
+  })
+})
diff --git a/test/bigtest.nbt b/test/bigtest.nbt
new file mode 100644
index 0000000..a2021df
Binary files /dev/null and b/test/bigtest.nbt differ