diff --git a/Cargo.lock b/Cargo.lock
index 84ceb68..9a67fda 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -80,6 +80,18 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 
+[[package]]
+name = "array"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "plantarium",
+ "serde",
+ "serde-wasm-bindgen",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.79"
@@ -3305,6 +3317,18 @@ version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
+[[package]]
+name = "sum"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "plantarium",
+ "serde",
+ "serde-wasm-bindgen",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
+]
+
 [[package]]
 name = "swift-rs"
 version = "1.0.6"
@@ -3969,6 +3993,18 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "triangle"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "plantarium",
+ "serde",
+ "serde-wasm-bindgen",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
+]
+
 [[package]]
 name = "try-lock"
 version = "0.2.5"
diff --git a/app/src/lib/helpers/flat_tree.ts b/app/src/lib/helpers/flat_tree.ts
index e7ad64f..96f65de 100644
--- a/app/src/lib/helpers/flat_tree.ts
+++ b/app/src/lib/helpers/flat_tree.ts
@@ -1,4 +1,3 @@
-
 type SparseArray<T = number> = (T | T[] | SparseArray<T>)[];
 
 // Encodes a nested array into a flat array with bracket and distance notation
diff --git a/app/src/lib/node-registry.ts b/app/src/lib/node-registry.ts
index 501126e..c9b292a 100644
--- a/app/src/lib/node-registry.ts
+++ b/app/src/lib/node-registry.ts
@@ -51,6 +51,9 @@ export class RemoteNodeRegistry implements NodeRegistry {
     const a = performance.now();
     nodeIds.push("max/plantarium/random");
     nodeIds.push("max/plantarium/float");
+    nodeIds.push("max/plantarium/array");
+    nodeIds.push("max/plantarium/sum");
+
     for (const id of nodeIds) {
       const nodeUrl = `${this.url}/n/${id}`;
       const response = await fetch(nodeUrl);
@@ -96,6 +99,8 @@ wasm = val;`);
 
 export class MemoryNodeRegistry implements NodeRegistry {
 
+  status: "loading" | "ready" | "error" = "ready";
+
   async load(nodeIds: string[]) {
     // Do nothing
   }
diff --git a/app/src/lib/runtime-executor.ts b/app/src/lib/runtime-executor.ts
index ab11ad1..6d99ef2 100644
--- a/app/src/lib/runtime-executor.ts
+++ b/app/src/lib/runtime-executor.ts
@@ -135,7 +135,12 @@ export class MemoryRuntimeExecutor implements RuntimeExecutor {
         }
 
         // execute the node and store the result
-        results[node.id] = node.tmp.type.execute(...Object.values(inputs)) as number;
+        try {
+          console.log(`Executing node ${node.tmp.type.id || node.id}`, inputs);
+          results[node.id] = node.tmp.type.execute(...Object.values(inputs)) as number;
+        } catch (e) {
+          console.error(`Error executing node ${node.tmp.type.id || node.id}`, e);
+        }
 
       }
     }
diff --git a/app/src/routes/test/+page.svelte b/app/src/routes/test/+page.svelte
index 9978819..294188a 100644
--- a/app/src/routes/test/+page.svelte
+++ b/app/src/routes/test/+page.svelte
@@ -8,7 +8,8 @@
   console.log("INPUT");
   console.log(input);
 
-  const encoded = encode(input);
+  let encoded = encode(input);
+  encoded = [0, 3, 5, ...encoded.slice(2).slice(0, -4), 5, 5, 1, 1];
   console.log("ENCODED");
   console.log(encoded);
 
diff --git a/nodes/max/plantarium/array/.gitignore b/nodes/max/plantarium/array/.gitignore
new file mode 100644
index 0000000..4e30131
--- /dev/null
+++ b/nodes/max/plantarium/array/.gitignore
@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log
diff --git a/nodes/max/plantarium/array/Cargo.toml b/nodes/max/plantarium/array/Cargo.toml
new file mode 100644
index 0000000..38c1803
--- /dev/null
+++ b/nodes/max/plantarium/array/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "array"
+version = "0.1.0"
+authors = ["Max Richter <jim-x@web.de>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.84"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+plantarium = { version = "0.1.0", path = "../../../../packages/plantarium" }
+serde = { version = "1.0", features = ["derive"] }
+serde-wasm-bindgen = "0.4"
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/nodes/max/plantarium/array/package.json b/nodes/max/plantarium/array/package.json
new file mode 100644
index 0000000..bc6fe14
--- /dev/null
+++ b/nodes/max/plantarium/array/package.json
@@ -0,0 +1,5 @@
+{
+  "scripts": {
+    "build": "wasm-pack build --release --out-name index --no-default-features"
+  }
+}
diff --git a/nodes/max/plantarium/array/src/lib.rs b/nodes/max/plantarium/array/src/lib.rs
new file mode 100644
index 0000000..487f6ce
--- /dev/null
+++ b/nodes/max/plantarium/array/src/lib.rs
@@ -0,0 +1,44 @@
+mod utils;
+use plantarium::{evaluate_parameters, unwrap_int, unwrap_string};
+use wasm_bindgen::prelude::*;
+
+// lifted from the `console_log` example
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn get_outputs() -> Vec<String> {
+    vec!["float".to_string()]
+}
+
+#[wasm_bindgen]
+pub fn get_input_types() -> String {
+    utils::set_panic_hook();
+    r#"{
+        "length": { "type": "float", "value": 2 }
+    }"#
+    .to_string()
+}
+
+#[rustfmt::skip]
+#[wasm_bindgen]
+pub fn execute(var_length: i32) -> Vec<f64> {
+    utils::set_panic_hook();
+
+
+    let length = var_length;//evaluate_parameters(var_length);
+
+    // construct array of length
+    let mut res = Vec::new();
+    for _ in 0..length as usize {
+        res.push(2.0);
+    }
+
+    log("executing array");
+
+    return res;
+
+}
diff --git a/nodes/max/plantarium/array/src/utils.rs b/nodes/max/plantarium/array/src/utils.rs
new file mode 100644
index 0000000..b1d7929
--- /dev/null
+++ b/nodes/max/plantarium/array/src/utils.rs
@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}
diff --git a/nodes/max/plantarium/array/tests/web.rs b/nodes/max/plantarium/array/tests/web.rs
new file mode 100644
index 0000000..de5c1da
--- /dev/null
+++ b/nodes/max/plantarium/array/tests/web.rs
@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}
diff --git a/nodes/max/plantarium/output/src/lib.rs b/nodes/max/plantarium/output/src/lib.rs
index 8bb4c90..a291e7d 100644
--- a/nodes/max/plantarium/output/src/lib.rs
+++ b/nodes/max/plantarium/output/src/lib.rs
@@ -1,5 +1,5 @@
 mod utils;
-use plantarium::evaluate_parameters;
+use plantarium::{evaluate_parameters, unwrap_float};
 use wasm_bindgen::prelude::*;
 
 // lifted from the `console_log` example
@@ -23,10 +23,8 @@ pub fn get_input_types() -> String {
     .to_string()
 }
 #[wasm_bindgen]
-pub fn execute(var_value: JsValue) -> f64 {
+pub fn execute(var_value: f64) -> f64 {
     utils::set_panic_hook();
 
-    let res = evaluate_parameters(var_value);
-
-    return res;
+    return var_value;
 }
diff --git a/nodes/max/plantarium/sum/.gitignore b/nodes/max/plantarium/sum/.gitignore
new file mode 100644
index 0000000..4e30131
--- /dev/null
+++ b/nodes/max/plantarium/sum/.gitignore
@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log
diff --git a/nodes/max/plantarium/sum/Cargo.toml b/nodes/max/plantarium/sum/Cargo.toml
new file mode 100644
index 0000000..7cf2cc7
--- /dev/null
+++ b/nodes/max/plantarium/sum/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "sum"
+version = "0.1.0"
+authors = ["Max Richter <jim-x@web.de>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.84"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+plantarium = { version = "0.1.0", path = "../../../../packages/plantarium" }
+serde = { version = "1.0", features = ["derive"] }
+serde-wasm-bindgen = "0.4"
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/nodes/max/plantarium/sum/package.json b/nodes/max/plantarium/sum/package.json
new file mode 100644
index 0000000..bc6fe14
--- /dev/null
+++ b/nodes/max/plantarium/sum/package.json
@@ -0,0 +1,5 @@
+{
+  "scripts": {
+    "build": "wasm-pack build --release --out-name index --no-default-features"
+  }
+}
diff --git a/nodes/max/plantarium/sum/src/lib.rs b/nodes/max/plantarium/sum/src/lib.rs
new file mode 100644
index 0000000..06b88f9
--- /dev/null
+++ b/nodes/max/plantarium/sum/src/lib.rs
@@ -0,0 +1,33 @@
+mod utils;
+use plantarium::{evaluate_parameters, unwrap_int, unwrap_string};
+use wasm_bindgen::prelude::*;
+
+// lifted from the `console_log` example
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn get_outputs() -> Vec<String> {
+    vec!["float".to_string()]
+}
+
+#[wasm_bindgen]
+pub fn get_input_types() -> String {
+    utils::set_panic_hook();
+    r#"{
+        "array": { "type": "float", "value": 2, "external": true }
+    }"#
+    .to_string()
+}
+
+#[rustfmt::skip]
+#[wasm_bindgen]
+pub fn execute(array: &[f64]) -> f64 {
+    utils::set_panic_hook();
+    let mut sum = 0.0;
+    array.iter().for_each(|x| sum += x);
+    return sum;
+}
diff --git a/nodes/max/plantarium/sum/src/utils.rs b/nodes/max/plantarium/sum/src/utils.rs
new file mode 100644
index 0000000..b1d7929
--- /dev/null
+++ b/nodes/max/plantarium/sum/src/utils.rs
@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}
diff --git a/nodes/max/plantarium/sum/tests/web.rs b/nodes/max/plantarium/sum/tests/web.rs
new file mode 100644
index 0000000..de5c1da
--- /dev/null
+++ b/nodes/max/plantarium/sum/tests/web.rs
@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}
diff --git a/nodes/max/plantarium/triangle/.gitignore b/nodes/max/plantarium/triangle/.gitignore
new file mode 100644
index 0000000..4e30131
--- /dev/null
+++ b/nodes/max/plantarium/triangle/.gitignore
@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log
diff --git a/nodes/max/plantarium/triangle/Cargo.toml b/nodes/max/plantarium/triangle/Cargo.toml
new file mode 100644
index 0000000..e86b624
--- /dev/null
+++ b/nodes/max/plantarium/triangle/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "triangle"
+version = "0.1.0"
+authors = ["Max Richter <jim-x@web.de>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.84"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+plantarium = { version = "0.1.0", path = "../../../../packages/plantarium" }
+serde = { version = "1.0", features = ["derive"] }
+serde-wasm-bindgen = "0.4"
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/nodes/max/plantarium/triangle/package.json b/nodes/max/plantarium/triangle/package.json
new file mode 100644
index 0000000..bc6fe14
--- /dev/null
+++ b/nodes/max/plantarium/triangle/package.json
@@ -0,0 +1,5 @@
+{
+  "scripts": {
+    "build": "wasm-pack build --release --out-name index --no-default-features"
+  }
+}
diff --git a/nodes/max/plantarium/triangle/src/lib.rs b/nodes/max/plantarium/triangle/src/lib.rs
new file mode 100644
index 0000000..b60ee0a
--- /dev/null
+++ b/nodes/max/plantarium/triangle/src/lib.rs
@@ -0,0 +1,48 @@
+mod utils;
+use plantarium::{evaluate_parameters, unwrap_int, unwrap_string};
+use wasm_bindgen::prelude::*;
+
+// lifted from the `console_log` example
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn get_outputs() -> Vec<String> {
+    vec!["float".to_string()]
+}
+
+#[wasm_bindgen]
+pub fn get_input_types() -> String {
+    utils::set_panic_hook();
+    r#"{
+        "min": { "type": "float", "value": 2 },
+        "max": { "type": "float", "value": 2 },
+        "seed": { "type": "seed" }
+    }"#
+    .to_string()
+}
+
+struct El {
+    value: Option<f64>,
+    array: Option<Vec<f64>>,
+    nested: Option<Box<El>>,
+}
+
+#[rustfmt::skip]
+#[wasm_bindgen]
+pub fn execute(var_min: JsValue, var_max: JsValue, var_seed: JsValue) -> Vec<f64> {
+    utils::set_panic_hook();
+
+
+    // construct vertices of a triangle
+    let min= evaluate_parameters(var_min);
+
+    return vec![
+        0.0, 0.0, 0.0,
+        min, 0.0, 0.0,
+        min, min, 0.0
+    ];
+}
diff --git a/nodes/max/plantarium/triangle/src/utils.rs b/nodes/max/plantarium/triangle/src/utils.rs
new file mode 100644
index 0000000..b1d7929
--- /dev/null
+++ b/nodes/max/plantarium/triangle/src/utils.rs
@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}
diff --git a/nodes/max/plantarium/triangle/tests/web.rs b/nodes/max/plantarium/triangle/tests/web.rs
new file mode 100644
index 0000000..de5c1da
--- /dev/null
+++ b/nodes/max/plantarium/triangle/tests/web.rs
@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}
diff --git a/packages/graph-interface/src/lib/edges/Edge.svelte b/packages/graph-interface/src/lib/edges/Edge.svelte
index f4ab8c9..33f28f0 100644
--- a/packages/graph-interface/src/lib/edges/Edge.svelte
+++ b/packages/graph-interface/src/lib/edges/Edge.svelte
@@ -27,7 +27,7 @@
   import { Color } from "three/src/math/Color.js";
   import { CubicBezierCurve } from "three/src/extras/curves/CubicBezierCurve.js";
   import { Vector2 } from "three/src/math/Vector2.js";
-  import { createEdgeGeometry } from "./createEdgeGeometry";
+  import { createEdgeGeometry } from "./createEdgeGeometry.js";
 
   export let from: { x: number; y: number };
   export let to: { x: number; y: number };
diff --git a/packages/node-registry/src/lib/registry.ts b/packages/node-registry/src/lib/registry.ts
index d3e4656..05191f1 100644
--- a/packages/node-registry/src/lib/registry.ts
+++ b/packages/node-registry/src/lib/registry.ts
@@ -36,8 +36,13 @@ export async function getNode(id: `${string}/${string}/${string}`) {
   const wrapper = await getNodeWasm(id);
 
   const outputs = wrapper.get_outputs();
-  const inputTypes = JSON.parse(wrapper.get_input_types());
+  const rawInputs = wrapper.get_input_types();
+  try {
+    const inputTypes = JSON.parse(rawInputs);
+    return { id, outputs, inputs: inputTypes }
+  } catch (e) {
+    console.log("Failed to parse input types for node", { id, rawInputs });
+  }
 
-  return { id, outputs, inputs: inputTypes }
 
 }