diff --git a/README.md b/README.md
index e0686cb..872cfa4 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,48 @@
-# cert-info.js
+cert-info.js
+============
+
 Read basic info from a cert.pem / x509 certificate.
+
+Install
+=======
+
+```bash
+# bin
+npm install --global certpem
+
+# node.js library
+npm install --save certpem
+```
+
+Usage
+=====
+
+For basic info (subject, altnames, issuedAt, expiresAt):
+
+```bash
+certpem /path/to/cert.pem
+```
+
+Output all info by passing `--debug` or use `--json` to see the basic info pretty-printed.
+
+```javascript
+'use strict';
+
+var certpem = require('certpem').certpem
+var cert = fs.readFile('cert.pem', 'ascii', function (err, certstr) {
+  console.info(cert.pem.info());
+
+  console.info(cert.pem.debug());
+});
+```
+
+```javascript
+{
+  "subject": "localhost.daplie.com",
+  "altnames": [
+    "localhost.daplie.com"
+  ],
+  "issuedAt": 1465516800000,
+  "expiresAt": 1499731199000
+}
+```
diff --git a/bin/certpem.js b/bin/certpem.js
new file mode 100755
index 0000000..a5f556f
--- /dev/null
+++ b/bin/certpem.js
@@ -0,0 +1,52 @@
+#!/usr/bin/env node
+
+'use strict';
+
+var certpem = require('../').certpem;
+var path = require('path');
+var filepath = (process.cwd() + path.sep + 'cert.pem');
+var debug = false;
+var json;
+var cert;
+
+if (/--debug/.test(process.argv[2]) || /--debug/.test(process.argv[3])) {
+  debug = true;
+}
+if (/--json/.test(process.argv[2]) || /--json/.test(process.argv[3])) {
+  json = true;
+}
+if (process.argv[2] && !/^--/.test(process.argv[2])) {
+  filepath = process.argv[2];
+}
+if (process.argv[3] && !/^--/.test(process.argv[3])) {
+  filepath = process.argv[3];
+}
+
+if (filepath.length > 256) {
+  cert = filepath;
+}
+else {
+  cert = require('fs').readFileSync(filepath, 'ascii');
+}
+
+if (debug) {
+  console.info(JSON.stringify(certpem.debug(cert), null, '  '));
+} else {
+  var c = certpem.info(cert);
+
+  if (json) {
+    console.info(JSON.stringify(c, null, '  '));
+    return;
+  }
+
+  console.info('');
+
+  console.info('Certificate for', c.subject);
+  console.info('');
+  console.info('Altnames:', c.altnames.join(', '));
+  console.info('');
+  console.info('Issued at', new Date(c.issuedAt));
+  console.info('Expires at', new Date(c.expiresAt));
+
+  console.info('');
+}
diff --git a/cert.pem b/cert.pem
new file mode 100644
index 0000000..4d3bcb3
--- /dev/null
+++ b/cert.pem
@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----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==
+-----END CERTIFICATE-----
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..893f9d6
--- /dev/null
+++ b/index.js
@@ -0,0 +1,84 @@
+'use strict';
+
+var certInfo = module.exports;
+module.exports.certpem = certInfo;
+
+require('buffer-v6-polyfill');
+
+// this is really memory expensive to do
+// (about half of a megabyte of loaded code)
+certInfo._pemToBinAb  = function (pem) {
+  var b64 = pem.replace(/(-----(BEGIN|END) CERTIFICATE-----|[\n\r])/g, '');
+  var buf = Buffer.from(b64, 'base64');
+  var ab = new Uint8Array(buf).buffer;          // WORKS
+  //var ab = buf.buffer                         // Doesn't work
+
+  return ab;
+};
+certInfo.debug = certInfo.getCertInfo = function (pem) {
+  var ab = module.exports._pemToBinAb(pem);
+  var merge = require("node.extend");
+
+  var common = require("asn1js/org/pkijs/common");
+  var _asn1js = require("asn1js");
+  var _pkijs = require("pkijs");
+  var _x509schema = require("pkijs/org/pkijs/x509_schema");
+
+  // #region Merging function/object declarations for ASN1js and PKIjs
+  var asn1js = merge(true, _asn1js, common);
+
+  var x509schema = merge(true, _x509schema, asn1js);
+
+  var pkijs_1 = merge(true, _pkijs, asn1js);
+  var pkijs = merge(true, pkijs_1, x509schema);
+
+  var asn1 = pkijs.org.pkijs.fromBER(ab);
+  var certSimpl = new pkijs.org.pkijs.simpl.CERT({ schema: asn1.result });
+
+  return certSimpl;
+};
+
+certInfo.info = certInfo.getBasicInfo = function (pem) {
+  var c = certInfo.getCertInfo(pem);
+  var domains = [];
+  var sub;
+
+  c.extensions.forEach(function (ext) {
+    if (ext.parsedValue && ext.parsedValue.altNames) {
+      ext.parsedValue.altNames.forEach(function (alt) {
+        domains.push(alt.Name);
+      });
+    }
+  });
+
+  sub = c.subject.types_and_values[0].value.value_block.value || null;
+
+  return {
+    subject: sub
+  , altnames: domains
+    // for debugging during console.log
+    // do not expect these values to be here
+  , _issuedAt: c.notBefore.value
+  , _expiresAt: c.notAfter.value
+  , issuedAt: new Date(c.notBefore.value).valueOf()
+  , expiresAt: new Date(c.notAfter.value).valueOf()
+  };
+};
+
+certInfo.getCertInfoFromFile = function (pemFile) {
+  return require('fs').readFileSync(pemFile, 'ascii');
+};
+
+/*
+certInfo.testGetCertInfo = function (pathname) {
+  var path = require('path');
+  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
+  return certInfo.getCertInfo(certInfo.getCertInfoFromFile(pemFile));
+};
+
+certInfo.testBasicCertInfo = function (pathname) {
+  var path = require('path');
+  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
+  return certInfo.getBasicInfo(certInfo.getCertInfoFromFile(pemFile));
+};
+*/
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..aac134c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "certpem",
+  "version": "1.0.0",
+  "description": "Read basic info (subject, altnames, expiresAt, issuedAt) from a cert.pem / x509 certificate (tls / ssl / https) ",
+  "main": "index.js",
+  "bin": {
+    "certpem": "bin/certpem.js"
+  },
+  "scripts": {
+    "test": "node test.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Daplie/cert-info.js.git"
+  },
+  "keywords": [
+    "cert.pem",
+    "cert",
+    "certificate",
+    "x509",
+    "subject",
+    "altnames",
+    "notBefore",
+    "notAfter",
+    "issuedAt",
+    "expiresAt",
+    "expired",
+    "expires",
+    "issued",
+    "at",
+    "asn1",
+    "pki"
+  ],
+  "author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
+  "license": "(MIT OR Apache-2.0)",
+  "bugs": {
+    "url": "https://github.com/Daplie/cert-info.js/issues"
+  },
+  "homepage": "https://github.com/Daplie/cert-info.js#readme",
+  "dependencies": {
+    "asn1js": "^1.2.12",
+    "buffer-v6-polyfill": "^1.0.3",
+    "node.extend": "^1.1.5",
+    "pkijs": "^1.3.27"
+  }
+}
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..20e788f
--- /dev/null
+++ b/test.js
@@ -0,0 +1,3 @@
+'use strict';
+
+require('./bin/certpem.js');