diff --git a/js/types/Cluster.js b/js/types/Cluster.js
deleted file mode 100644
index a1d842aa..00000000
--- a/js/types/Cluster.js
+++ /dev/null
@@ -1,17 +0,0 @@
-export class Cluster {
-  constructor() {
-    // Physics properties
-    this.type = 0;
-    this.energy = 0; // GeV
-    this.energyError = 0; // GeV
-    this.position = []; // mm
-    this.positionError = [];
-    this.iTheta = 0;
-    this.phi = 0;
-    this.directionError; // mm^2
-    this.shapeParameters = [];
-    this.subdetectorEnergies = [];
-    this.clusters = [];
-    this.hits = [];
-  }
-}
diff --git a/js/types/ParticleID.js b/js/types/ParticleID.js
deleted file mode 100644
index 69f5e890..00000000
--- a/js/types/ParticleID.js
+++ /dev/null
@@ -1,10 +0,0 @@
-export class ParticleID {
-  constructor() {
-    // Physics properties
-    this.type = 0;
-    this.pdg = 0;
-    this.algorithmType = 0;
-    this.likelihood = 0;
-    this.parameters = [];
-  }
-}
diff --git a/js/types/RecoParticle.js b/js/types/RecoParticle.js
deleted file mode 100644
index 4f68b320..00000000
--- a/js/types/RecoParticle.js
+++ /dev/null
@@ -1,17 +0,0 @@
-export class ReconstructedParticle {
-  constructor() {
-    // Physics properties
-    this.pdg = 0;
-    this.energy = 0; // GeV
-    this.momentum = 0; // GeV
-    this.referencePoint = 0; // mm
-    this.charge = 0;
-    this.mass = 0; // GeV
-    this.goodnessOfPID = 0;
-    this.covMatrix = [];
-    this.startVertex = [];
-    this.clusters = [];
-    this.tracks = [];
-    this.particles = [];
-  }
-}
diff --git a/js/types/Track.js b/js/types/Track.js
deleted file mode 100644
index 5a910826..00000000
--- a/js/types/Track.js
+++ /dev/null
@@ -1,15 +0,0 @@
-export class Track {
-  constructor() {
-    // Physics properties
-    this.type = 0;
-    this.chi2 = 0;
-    this.ndf = 0;
-    this.dEdx = 0;
-    this.dEdxError = 0;
-    this.radiusOfInnermostHit = 0;
-    this.subdetectorHitNumbers = [];
-    this.dxQuantities = [];
-    this.trackerHits = [];
-    this.tracks = [];
-  }
-}
diff --git a/js/types/Vertex.js b/js/types/Vertex.js
deleted file mode 100644
index d954723c..00000000
--- a/js/types/Vertex.js
+++ /dev/null
@@ -1,13 +0,0 @@
-export class Vertex {
-  constructor() {
-    // Physics properties
-    this.primary = 0;
-    this.chi2 = 0;
-    this.probability = 0;
-    this.position = 0; // mm
-    this.covMatrix = [];
-    this.algorithmType = 0;
-    this.parameters = 0;
-    this.associatedParticles = [];
-  }
-}
diff --git a/js/types/load.js b/js/types/load.js
new file mode 100644
index 00000000..7c88b530
--- /dev/null
+++ b/js/types/load.js
@@ -0,0 +1,62 @@
+import jsonData from "../../input/p8_ee_ZH_ecm240_edm4hep.edm4hep.json" assert { type: "json" }; // node 20
+import {
+  Cluster,
+  ParticleID,
+  ReconstructedParticle,
+  Vertex,
+  Track,
+} from "./reconstruction.js";
+
+const loaders = {
+  ReconstructedParticle: ReconstructedParticle.load,
+  ParticleID: ParticleID.load,
+  Vertex: Vertex.load,
+  Track: Track.load,
+  Cluster: Cluster.load,
+};
+
+const loadersConfig = [
+  "ReconstructedParticle",
+  "ParticleID",
+  "Vertex",
+  "Track",
+  "Cluster",
+];
+
+function selectedParticles(loaders, particles) {
+  let newLoader = {};
+
+  for (const particle of particles) {
+    if (loaders.hasOwnProperty(particle)) {
+      newLoader[particle] = loaders[particle];
+    }
+  }
+
+  return newLoader;
+}
+
+export function loadParticles(event, loadersConfig) {
+  const eventData = Object.values(jsonData["Event " + event]);
+
+  const particles = [];
+
+  const loader = selectedParticles(loaders, loadersConfig);
+
+  for (const [type, loadFunction] of Object.entries(loader)) {
+    const particlesType = eventData.filter(
+      (element) => element.collType === `edm4hep::${type}Collection`
+    );
+
+    particlesType.forEach((collection) => {
+      const loadedParticles = loadFunction(collection.collection);
+    });
+  }
+  try {
+  } catch (error) {
+    console.error(error);
+  }
+
+  return particles;
+}
+
+loadParticles(4, loadersConfig);
diff --git a/js/types/reconstruction.js b/js/types/reconstruction.js
new file mode 100644
index 00000000..f072440f
--- /dev/null
+++ b/js/types/reconstruction.js
@@ -0,0 +1,175 @@
+export class Cluster {
+  constructor() {
+    // Physics properties
+    this.type = 0;
+    this.energy = 0; // GeV
+    this.energyError = 0; // GeV
+    this.position = []; // mm
+    this.positionError = [];
+    this.iTheta = 0;
+    this.phi = 0;
+    this.directionError = {}; // mm^2
+    this.shapeParameters = [];
+    this.subdetectorEnergies = [];
+    this.clusters = [];
+    this.hits = [];
+  }
+
+  static load(collection) {
+    const particles = [];
+
+    for (const [index, particle] of collection.entries()) {
+      const cluster = new Cluster();
+      cluster.index = index;
+
+      cluster.type = particle.type;
+      cluster.energy = particle.energy;
+      cluster.energyError = particle.energyError;
+      cluster.position = particle.position;
+      cluster.positionError = particle.positionError;
+      cluster.iTheta = particle.iTheta;
+      cluster.phi = particle.phi;
+      cluster.directionError = particle.directionError;
+      cluster.shapeParameters = particle.shapeParameters;
+      cluster.subdetectorEnergies = particle.subdetectorEnergies;
+      cluster.clusters = particle.clusters;
+      cluster.hits = particle.hits;
+
+      particles.push(cluster);
+    }
+
+    return particles;
+  }
+}
+
+export class ParticleID {
+  constructor() {
+    // Physics properties
+    this.type = 0;
+    this.pdg = 0;
+    this.algorithmType = 0;
+    this.likelihood = 0;
+    this.parameters = [];
+    this.particle = [];
+  }
+
+  static load(collection) {
+    const particles = [];
+
+    for (const [index, particle] of collection.entries()) {
+      const particleID = new ParticleID();
+      particleID.index = index;
+
+      particleID.type = particle.type;
+      particleID.pdg = particle.pdg;
+      particleID.algorithmType = particle.algorithmType;
+      particleID.likelihood = particle.likelihood;
+      particleID.parameters = particle.parameters;
+
+      particles.push(particleID);
+    }
+
+    return particles;
+  }
+}
+
+export class ReconstructedParticle {
+  constructor() {
+    // Physics properties
+    this.pdg = 0;
+    this.energy = 0; // GeV
+    this.momentum = {}; // GeV
+    this.referencePoint = {}; // mm
+    this.charge = 0;
+    this.mass = 0; // GeV
+    this.goodnessOfPID = 0;
+    this.covMatrix = [];
+    this.startVertex = {};
+    this.clusters = [];
+    this.tracks = [];
+    this.particles = [];
+  }
+
+  static load(collection) {
+    const particles = [];
+
+    for (const [index, particle] of collection.entries()) {
+      const reconstructedParticle = new ReconstructedParticle();
+      reconstructedParticle.index = index;
+
+      reconstructedParticle.energy = particle.energy;
+      reconstructedParticle.momentum = particle.momentum;
+      reconstructedParticle.referencePoint = particle.referencePoint;
+      reconstructedParticle.charge = particle.charge;
+      reconstructedParticle.mass = particle.mass;
+      reconstructedParticle.goodnessOfPID = particle.goodnessOfPID;
+      reconstructedParticle.covMatrix = particle.covMatrix;
+      reconstructedParticle.startVertex = particle.startVertex;
+      reconstructedParticle.clusters = particle.clusters;
+      reconstructedParticle.tracks = particle.tracks;
+      reconstructedParticle.particles = particle.particles;
+
+      particles.push(reconstructedParticle);
+    }
+
+    return particles;
+  }
+}
+
+export class Vertex {
+  constructor() {
+    // Physics properties
+    this.primary = 0;
+    this.chi2 = 0;
+    this.probability = 0;
+    this.position = 0; // mm
+    this.covMatrix = [];
+    this.algorithmType = 0;
+    this.parameters = 0;
+    this.associatedParticles = [];
+  }
+
+  static load() {}
+}
+
+export class Track {
+  constructor() {
+    // Physics properties
+    this.type = 0;
+    this.chi2 = 0;
+    this.ndf = 0;
+    this.dEdx = 0;
+    this.dEdxError = 0;
+    this.radiusOfInnermostHit = 0;
+    this.subdetectorHitNumbers = [];
+    this.trackStates = [];
+    this.dxQuantities = [];
+    this.trackerHits = [];
+    this.tracks = [];
+  }
+
+  static load(collection) {
+    const particles = [];
+
+    for (const [index, particle] of collection.entries()) {
+      const track = new Track();
+      track.index = index;
+
+      track.type = particle.type;
+      track.chi2 = particle.chi2;
+      track.ndf = particle.ndf;
+      track.dEdx = particle.dEdx;
+      track.dEdxError = particle.dEdxError;
+      track.radiusOfInnermostHit = particle.radiusOfInnermostHit;
+      track.subdetectorHitNumbers = particle.subdetectorHitNumbers;
+      track.trackStates = particle.trackStates;
+      track.dxQuantities = particle.dxQuantities;
+      track.trackerHits = particle.trackerHits;
+      track.tracks = particle.tracks;
+
+      particles.push(track);
+    }
+
+    return particles;
+  }
+}