diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000..02f8973
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,7 @@
+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.
diff --git a/index.js b/index.js
index fe646ae..ab0c358 100644
--- a/index.js
+++ b/index.js
@@ -10,56 +10,60 @@ var names = [];
 var stars = [];
 var planets = [];
 
-function generate() {
-    var spiral_arms = 2, spiral_angle_degrees = 360, min_radius = 0.05, max_radius = 0.9, thickness = 0.1, scatter_theta = Math.PI / spiral_arms * 0.2, scatter_radius = min_radius * 0.4, spiral_b = spiral_angle_degrees / Math.PI * min_radius / max_radius, start = (new Date()).getTime(), names = [], rejects = {
-        badwords: 0,
-        duplicates: 0
-    }, totalCount = 1000, i, position;
+function generate(seed, amount) {
+  if (!amount) amount = 1000;
+  if (!seed)  seed = 1234;
+  var spiral_arms = 2, spiral_angle_degrees = 360, min_radius = 0.05, max_radius = 0.9, thickness = 0.1, scatter_theta = Math.PI / spiral_arms * 0.2, scatter_radius = min_radius * 0.4, spiral_b = spiral_angle_degrees / Math.PI * min_radius / max_radius, start = (new Date()).getTime(), names = [], rejects = {
+      badwords: 0,
+      duplicates: 0
+  }, totalCount = amount, i, position;
 
-    pseudoRandom = new PRNG('96aa48');
+  pseudoRandom = new PRNG(seed);
 
-    for (i = 0; i < totalCount; i++) {
-        var number_of_syllables = Math.floor(pseudoRandom.value() * 2 + 2), new_name;
-        while (true) {
-            new_name = utils.random_name(pseudoRandom, number_of_syllables);
-            if (names.indexOf(new_name) >= 0) {
-                rejects.duplicates++;
-            } else if (data.badwords.indexOf(new_name) >= 0 || data.badwords.indexContains(new_name) >= 0) {
-                rejects.badwords++
-            } else {
-                break;
-            }
-        }
-        names.push(new_name);
-        var r = pseudoRandom.realRange(min_radius, max_radius);
-        var theta = spiral_b * Math.log(r / max_radius) + pseudoRandom.gaussrandom(scatter_theta);
-        r += pseudoRandom.gaussrandom(scatter_radius);
-        // assign to a spiral arm
-        theta += pseudoRandom.range(0, spiral_arms - 1) * Math.PI * 2 / spiral_arms;
-        position = {
-            x: Math.cos(theta) * r * 100,
-            y: Math.sin(theta) * r * 100,
-            z: pseudoRandom.gaussrandom(thickness * 0.5)
-        };
-        stars.push(new Star(new_name,pseudoRandom.range(1, 100000),position));
-    }
-    stars.sort(function(a, b) {
-        return a.name > b.name ? 1 : (a.name < b.name ? -1 : 0);
-    });
+  for (i = 0; i < totalCount; i++) {
+      var number_of_syllables = Math.floor(pseudoRandom.value() * 2 + 2), new_name;
+      while (true) {
+          new_name = utils.random_name(pseudoRandom, number_of_syllables);
+          if (names.indexOf(new_name) >= 0) {
+              rejects.duplicates++;
+          } else if (data.badwords.indexOf(new_name) >= 0 || data.badwords.indexContains(new_name) >= 0) {
+              rejects.badwords++
+          } else {
+              break;
+          }
+      }
+      names.push(new_name);
+      var r = pseudoRandom.realRange(min_radius, max_radius);
+      var theta = spiral_b * Math.log(r / max_radius) + pseudoRandom.gaussrandom(scatter_theta);
+      r += pseudoRandom.gaussrandom(scatter_radius);
+      // assign to a spiral arm
+      theta += pseudoRandom.range(0, spiral_arms - 1) * Math.PI * 2 / spiral_arms;
+      position = {
+          x: Math.cos(theta) * r * 100,
+          y: Math.sin(theta) * r * 100,
+          z: pseudoRandom.gaussrandom(thickness * 0.5)
+      };
+      stars.push(new Star(new_name,pseudoRandom.range(1, 100000),position));
+  }
+  stars.sort(function(a, b) {
+      return a.name > b.name ? 1 : (a.name < b.name ? -1 : 0);
+  });
 
-    let temp = stars.pop()
+  let temp = stars.pop()
 
-    Object.assign(temp, temp.description());
+  Object.assign(temp, temp.description());
 
-    for (star of stars) {
-      Object.assign(star, star.description());
-    }
+  for (star of stars) {
+    Object.assign(star, star.description());
+  }
 
-    fs.writeFileSync(__dirname + '/galaxy.json', JSON.stringify(stars, null, 2))
+  return stars;
+  // fs.writeFileSync(__dirname + '/galaxy.json', JSON.stringify(stars, null, 2))
 
-
-    console.log('names rejected', rejects);
-    console.log('generate elapsed', (((new Date()).getTime() - start) * 0.001).toFixed(3) + "s");
+  // console.log('names rejected', rejects);
+  // console.log('generate elapsed', (((new Date()).getTime() - start) * 0.001).toFixed(3) + "s");
 }
 
-generate();
+module.exports = {
+  "generate": generate
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f9e9e6f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,27 @@
+{
+  "name": "galaxygen",
+  "version": "1.0.0",
+  "description": "A galaxy generator based on loewald.com/galaxy",
+  "main": "index.js",
+  "scripts": {
+    "test": "node index test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/96aa48/galaxygen.git"
+  },
+  "keywords": [
+    "galaxy",
+    "generator",
+    "loewald",
+    "lore",
+    "universe",
+    "prng"
+  ],
+  "author": "Bram van der Veen",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/96aa48/galaxygen/issues"
+  },
+  "homepage": "https://github.com/96aa48/galaxygen#readme"
+}
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..829b60f
--- /dev/null
+++ b/test.js
@@ -0,0 +1,3 @@
+const galaxy = require('./index');
+
+console.log(galaxy.generate());