diff --git a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/controler/DatasetController.java b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/controler/DatasetController.java
new file mode 100644
index 0000000..64f92cd
--- /dev/null
+++ b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/controler/DatasetController.java
@@ -0,0 +1,103 @@
+package de.uni_passau.fim.PADAS.group3.DataDash.controler;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.web.bind.annotation.*;
+import de.uni_passau.fim.PADAS.group3.DataDash.model.Dataset;
+import de.uni_passau.fim.PADAS.group3.DataDash.model.DatasetService;
+import de.uni_passau.fim.PADAS.group3.DataDash.model.Type;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.web.config.EnableSpringDataWebSupport;
+import org.springframework.data.domain.Sort;
+
+import java.util.UUID;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@RestController
+@RequestMapping("/api/v1/datasets")
+@EnableSpringDataWebSupport
+public class DatasetController {
+    @Autowired
+    private DatasetService datasetService;
+
+    // @GetMapping
+    // public List<Dataset> getAllDatasets() {
+    // return datasetService.getAllDatasets();
+    // }
+
+    @GetMapping("/id/{id}")
+    public Dataset getDatasetById(@PathVariable("id") UUID id) {
+        return datasetService.getDatasetById(id);
+    }
+
+    @PostMapping
+    public Dataset createDataset(@RequestBody Dataset dataset) {
+        datasetService.addDataset(dataset);
+        // TODO: figure out what the fuck i need to do here
+        return null;
+    }
+
+    // @PutMapping("/{id}")
+    // public Dataset updateDataset(@PathVariable("id") Long id, @RequestBody
+    // Dataset dataset) {
+    // return datasetService.updateDataset(id, dataset);
+    // }
+    //
+
+    @DeleteMapping("/id/{id}")
+    public void deleteDataset(@PathVariable("id") UUID id) {
+        datasetService.deleteDataset(id);
+    }
+
+    @PostMapping("/id/{id}/upvote")
+    public Dataset upvote(@PathVariable("id") UUID id) {
+        datasetService.upvoteDataset(id);
+        return null;
+    }
+
+    @PostMapping("/id/{id}/downvote")
+    public Dataset downvote(@PathVariable("id") UUID id) {
+        datasetService.downvoteDataset(id);
+        return null; // new ResponseEntity<>(null, HttpStatus.OK);
+    }
+
+    @PostMapping("/id/{id}/vote")
+    public String postMethodName(@PathVariable("id") UUID id,
+            @RequestParam("stars") int stars) {
+        if (stars > 0 && stars < 6) {
+            datasetService.voteDataset(id, stars);
+            return null;
+        }
+        return "Invalid vote";
+    }
+
+    @GetMapping
+    public Page<Dataset> getDatasetsByDateAfter(@RequestParam(value = "author", required = false) String author,
+            @RequestParam(value = "title", required = false) String title,
+            @RequestParam(value = "description", required = false) String description,
+            @RequestParam(value = "abst", required = false) String abst,
+            @RequestParam(value = "type", required = false) Type type,
+            @RequestParam(value = "min-raiting", required = false) Float raiting,
+            @RequestParam(value = "page", required = false, defaultValue = "0") int page,
+            @RequestParam(value = "size", required = false, defaultValue = "20") int size,
+            @RequestParam(value = "sort", required = false, defaultValue = "upvotes") String sort,
+            @RequestParam(value = "direction", required = false, defaultValue = "desc") String direction) {
+        Pageable pageable = PageRequest.of(page, size,
+                Sort.by(direction.equals("asc") ? Sort.Direction.ASC : Sort.Direction.DESC, sort));
+        return datasetService.getDatasetsByOptionalCriteria(title, description, author, abst, type, raiting, pageable);
+    }
+
+    @GetMapping("/search")
+    public Page<Dataset> search(@RequestParam(value = "search", required = false, defaultValue = "%") String search,
+            @RequestParam(value = "page", required = false, defaultValue = "0") int page,
+            @RequestParam(value = "size", required = false, defaultValue = "20") int size,
+            @RequestParam(value = "sort", required = false, defaultValue = "upvotes") String sort,
+            @RequestParam(value = "direction", required = false, defaultValue = "desc") String direction) {
+        Pageable pageable = PageRequest.of(page, size,
+                Sort.by(direction.equals("asc") ? Sort.Direction.ASC : Sort.Direction.DESC, sort));
+        return datasetService.searchByOptionalCriteria(search, pageable);
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/Dataset.java b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/Dataset.java
index 09bc384..52cd1b4 100644
--- a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/Dataset.java
+++ b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/Dataset.java
@@ -1,7 +1,9 @@
 package de.uni_passau.fim.PADAS.group3.DataDash.model;
 
-import java.sql.Date;
+import java.net.URL;
+import java.time.LocalDate;
 import java.util.UUID;
+
 import jakarta.persistence.Entity;
 import jakarta.persistence.EnumType;
 import jakarta.persistence.Enumerated;
@@ -27,25 +29,31 @@ public class Dataset {
 
     private String author;
 
-    private Date date;
+    private LocalDate date;
 
     private float raiting;
 
     private int votes;
 
+    private int upvotes;
+
+    private URL url;
+
     private String[] categories;
 
-    public Dataset(String title, String abst, String description, String author, Date date, String[] categories, Type type) {
+    public Dataset(String title, String abst, String description, String author, URL url, String[] categories, Type type) {
 
         this.raiting = 0;
         this.votes = 0;
+        this.upvotes = 0;
         setTitle(title);
         setAbst(abst);        
         setDescription(description);        
         setAuthor(author);
-        setDate(date);        
+        setDate(LocalDate.now());        
         setCategories(categories);        
         setType(type);
+        setUrl(url);
     }
 
     public Dataset() {
@@ -64,7 +72,7 @@ public class Dataset {
         return categories;
     }
 
-    public Date getDate() {
+    public LocalDate getDate() {
         return date;
     }
 
@@ -92,6 +100,14 @@ public class Dataset {
         return votes;
     }
 
+    public int getUpvotes() {
+        return upvotes;
+    }
+
+    public URL getUrl() {
+        return url;
+    }
+
     public void setAbst(String abst) {
         this.abst = abst.substring(0, Math.min(abst.length(), 100));
     }
@@ -104,13 +120,17 @@ public class Dataset {
         this.categories = categories;
     }
     
-    public void setDate(Date date) {
-        this.date = date;
+    public void setDate(LocalDate localDate) {
+        this.date = localDate;
     }
     
     public void setDescription(String description) {
         this.description = description;
     }
+
+    public void setUrl(URL url) {
+       this.url = url;
+    }
  
     public void setTitle(String title) {
         this.title = title.substring(0, Math.min(title.length(), 50));
@@ -124,4 +144,12 @@ public class Dataset {
         raiting = (raiting*votes + stars) / (++votes);
     }
 
+    public void upvote() {
+        upvotes++;
+    }
+
+    public void downvote() {
+        upvotes--;
+    }
+
 }
diff --git a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/DatasetService.java b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/DatasetService.java
new file mode 100644
index 0000000..c34e55b
--- /dev/null
+++ b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/DatasetService.java
@@ -0,0 +1,102 @@
+package de.uni_passau.fim.PADAS.group3.DataDash.model;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.data.domain.Page;
+
+
+@Service
+public class DatasetService {
+    private dataRepository datasetRepository;
+
+    public DatasetService(dataRepository datasetRepository) {
+        this.datasetRepository = datasetRepository;
+    }
+
+    public List<Dataset> getAllDatasets() {
+        return datasetRepository.findAll();
+    }
+
+    public Dataset getDatasetById(UUID id) {
+        return datasetRepository.getDatasetById(id);
+    }
+
+    public void addDataset(Dataset dataset) {
+        datasetRepository.save(dataset);
+    }
+
+    public void updateDatasetTitle(UUID id, String title) {
+        datasetRepository.getDatasetById(id).setTitle(title);
+    }
+
+    public void voteDataset(UUID id, int vote) {
+        Dataset dataset = datasetRepository.getDatasetById(id);
+        dataset.vote(vote);
+        datasetRepository.save(dataset);
+    }
+
+    public void deleteDataset(UUID id) {
+        Dataset dataset = datasetRepository.getDatasetById(id);
+        datasetRepository.delete(dataset);
+    }
+
+    public List<Dataset> getDatasetsByTitle(String title) {
+        return datasetRepository.findByTitle(title);
+    }
+
+    public List<Dataset> getDatasetsByTitleLike(String title) {
+        return datasetRepository.findByTitleLike(title);
+    }
+
+    public List<Dataset> findByDescriptionLike(String description) {
+        return datasetRepository.findByDescriptionLike(description);
+    }
+
+    public List<Dataset> getDatasetsByAuthorLike(String author) {
+        return datasetRepository.findByAuthorLike(author);
+    }
+
+    public List<Dataset> getDatasetsByType(Type type) {
+        return datasetRepository.findByType(type);
+    }
+
+    public List<Dataset> getDatasetsByAbstLike(String abst) {
+        return datasetRepository.findByAbstLike(abst);
+    }
+
+    public List<Dataset> getDatasetsByRaitingGreaterThan(float raiting) {
+        return datasetRepository.findByRaitingGreaterThan(raiting);
+    }
+
+    public void upvoteDataset(UUID id) {
+        Dataset dataset = datasetRepository.getDatasetById(id);
+        dataset.upvote();
+        datasetRepository.save(dataset);
+    }
+
+    public void downvoteDataset(UUID id) {
+        Dataset dataset = datasetRepository.getDatasetById(id);
+        dataset.downvote();
+        datasetRepository.save(dataset);
+    }
+
+    public Page<Dataset> getDatasetsByOptionalCriteria(String title, String description, String author, String abst,
+            Type type, Float raiting, Pageable pageable) {
+        String[] categories = null;
+        return datasetRepository.findByOptionalCriteria(Optional.ofNullable(title), Optional.ofNullable(description),
+                Optional.ofNullable(author), Optional.ofNullable(abst), Optional.ofNullable(type),
+                Optional.ofNullable(categories), Optional.ofNullable(raiting), pageable);
+    }
+
+    public Page<Dataset> searchByOptionalCriteria(String search, Pageable pageable) {
+        if (search.equals("%")) {
+            System.out.println("searching for all datasets");
+            return datasetRepository.findAll(pageable);
+        }
+        return datasetRepository.searchByOptionalCriteria(Optional.ofNullable(search), pageable);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/LoadDummyDatabase.java b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/LoadDummyDatabase.java
index 8b1ff2d..ba8f166 100644
--- a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/LoadDummyDatabase.java
+++ b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/LoadDummyDatabase.java
@@ -1,5 +1,6 @@
 package de.uni_passau.fim.PADAS.group3.DataDash.model;
 
+import java.net.URL;
 import java.sql.Date;
 import java.util.List;
 
@@ -22,7 +23,7 @@ public class LoadDummyDatabase {
 
         return args -> {
         for (int i = 0; i < 100; i++) {
-            Dataset dataset = new Dataset("Title" + i, "Abst" + i, "Description" + i, "Author" + i, new Date(0), new String[]{"Category" + i}, Type.API);
+            Dataset dataset = new Dataset("Title" + i, "Abst" + i, "Description" + i, "Author" + i,null, new String[]{"Category" + i}, Type.API);
             repository.save(dataset);
             log.info("Preloading" + repository.save(dataset));
         }
diff --git a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/dataRepository.java b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/dataRepository.java
index 46fd8d4..b2934d8 100644
--- a/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/dataRepository.java
+++ b/src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/dataRepository.java
@@ -1,12 +1,20 @@
 package de.uni_passau.fim.PADAS.group3.DataDash.model;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.UUID;
 import java.sql.Date;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
 
 public interface dataRepository extends JpaRepository<Dataset, UUID>{
 
+    Dataset getDatasetById(UUID id);
     List<Dataset> findByTitle(String title);
     List<Dataset> findByTitleLike(String title);
     List<Dataset> findByAuthorLike(String author);
@@ -20,5 +28,32 @@ public interface dataRepository extends JpaRepository<Dataset, UUID>{
     List<Dataset> findByDateAfter(Date date);
     List<Dataset> findByDateBefore(Date date);
     List<Dataset> findByDateBetween(Date date1, Date date2);
+    @SuppressWarnings("null")
+    Page<Dataset> findAll(Pageable pageable);
+
+    @Query("SELECT d FROM Dataset d WHERE " +
+    "(COALESCE(:title, '') = '' OR d.title LIKE :title) AND " +
+    "(COALESCE(:description, '') = '' OR d.description LIKE :description) AND" +
+    "(COALESCE(:author, '') = '' OR d.author LIKE :author) AND" +
+    "(COALESCE(:abst, '') = '' OR d.abst LIKE :abst) AND" +
+    "(:type IS NULL OR d.type = :type) AND"+
+    "(:categories IS NULL OR d.categories = :categories) AND" +
+    "(:raiting IS NULL OR d.raiting > :raiting)")
+    Page<Dataset>findByOptionalCriteria(@Param("title") Optional<String> title,
+                                      @Param("description") Optional<String> description,
+                                      @Param("author") Optional<String> author,
+                                      @Param("abst") Optional<String> abst,
+                                      @Param("type") Optional<Type> type,
+                                      @Param("categories") Optional<String[]> categories,
+                                      @Param("raiting") Optional<Float> raiting,
+                                      Pageable pageable);
+
+
+     @Query("SELECT d FROM Dataset d WHERE " +
+    "(LOWER(d.title) LIKE LOWER(:search)) OR " +
+    "(LOWER(d.description) LIKE LOWER(:search)) OR " +
+    "(LOWER(d.author) LIKE LOWER(:search))")
+    Page<Dataset>searchByOptionalCriteria(@Param("search") Optional<String> search,
+                                      Pageable pageable);
     
 }
\ No newline at end of file
diff --git a/src/main/resources/static/contentUtility.js b/src/main/resources/static/contentUtility.js
new file mode 100644
index 0000000..61c9f36
--- /dev/null
+++ b/src/main/resources/static/contentUtility.js
@@ -0,0 +1,14 @@
+import { searchBarTimeout } from "./main.js"
+
+export function fetchQuery(fetchString) {
+    clearTimeout(searchBarTimeout);
+    fetch(fetchString)
+        .then(resp => resp.json())
+        .then((data) => {
+            parseContent(data.content);
+        });
+}
+
+function parseContent(content) {
+    //TODO: method for parsing query results
+}
diff --git a/src/main/resources/static/main.js b/src/main/resources/static/main.js
new file mode 100644
index 0000000..91dd9e0
--- /dev/null
+++ b/src/main/resources/static/main.js
@@ -0,0 +1,127 @@
+import { fetchQuery } from "./contentUtility.js";
+
+const apiEndpoint = "/api/v1/datasets";
+const baseURL = location.origin;
+const defaultPagingValue = 20;
+const lastQuery = {
+    url: "",
+    totalPages: 0,
+    currentPage: 0
+};
+
+// definition of all buttons
+const addButton = document.getElementById("add-btn");
+const filterButton = document.getElementById("filter-btn");
+const searchButton = document.getElementById("search-btn");
+const searchBar = document.getElementById("search-entry");
+const sortButton = document.getElementById("sort-btn");
+const upvoteButtons = document.getElementsByClassName("upvote-btn");
+const downvoteButtons = document.getElementsByClassName("downvote-btn");
+
+// ID of the timeout, because we need to cancel it at some point
+export let searchBarTimeout;
+
+// Event listeners
+addButton.addEventListener("click", () => {
+    navigateToAdd();
+});
+
+filterButton.addEventListener("change", () => {
+    const filterString = filterButton.value;
+    filter(filterString);
+});
+
+searchButton.addEventListener("click", () => {
+    const searchString = searchBar.value;
+    search(searchString);
+});
+
+searchBar.addEventListener("input", () => {
+    clearTimeout(searchBarTimeout);
+    searchBarTimeout = setTimeout(() => {
+        const searchString = searchBar.value;
+        search(searchString);
+    }, 1000);
+});
+
+searchBar.addEventListener('keypress', function (e) {
+    if (e.key === 'Enter') {
+        const searchString = searchBar.value;
+        search(searchString);
+    }
+})
+
+sortButton.addEventListener("change", () => {
+    const sortString = sortButton.value;
+    sort(sortString);
+});
+
+const upvoteButtonClickListener = e  => {
+    const entryID = e.target.parentElement.parentElement.dataset.id;
+    vote(entryID, true);
+};
+for (const upvoteButton of upvoteButtons) {
+    upvoteButton.addEventListener("click", upvoteButtonClickListener);
+}
+
+const downvoteButtonClickListener = e  => {
+    const entryID = e.target.parentElement.parentElement.dataset.id;
+    vote(entryID, false);
+};
+for (const downvoteButton of downvoteButtons) {
+    downvoteButton.addEventListener("click", downvoteButtonClickListener);
+}
+
+// functions of the main page
+function navigateToAdd() {
+    //TODO: url to add page not yet implemented, add here
+}
+
+function filter(filterString) {
+    filterString = filterString.toUpperCase();
+
+    let fetchURL = new URL(apiEndpoint, baseURL);
+    fetchURL.searchParams.append("type", filterString);
+    fetchURL.searchParams.append("size", defaultPagingValue);
+
+    console.log(fetchURL); // TODO: remove
+    fetchQuery(fetchURL);
+}
+
+function search(searchString) {
+    let fetchURL = new URL(apiEndpoint + "/search", baseURL);
+    fetchURL.searchParams.append("search", searchString.length == 0 ? "%" : searchString);
+
+    console.log(fetchURL); // TODO: remove
+    fetchQuery(fetchURL);
+}
+
+function sort(sortString) {
+    let query = sortString.toLowerCase().split(" ");
+    if (query[1] === "a-z" || query[1] === "↑") {
+        query[1] = "asc";
+    } else {
+        query[1] = "desc";
+    }
+
+    let fetchURL = new URL(apiEndpoint, baseURL);
+    fetchURL.searchParams.append("sort", query[0]);
+    fetchURL.searchParams.append("direction", query[1]);
+
+    console.log(fetchURL); // TODO: remove
+    fetchQuery(fetchURL);
+}
+
+function vote(entryID, up) {
+    const fetchURL = new URL(
+        `${apiEndpoint}/id/${entryID}/${up ? "up" : "down"}vote`,
+        baseURL,
+    );
+
+    console.log(fetchURL); // TODO: remove
+    fetch(fetchURL);
+}
+
+function incrementPageCount() {
+    lastQuery.currentPage++;
+}
diff --git a/src/main/resources/templates/index.html b/src/main/resources/templates/index.html
index 0a7587d..4355483 100644
--- a/src/main/resources/templates/index.html
+++ b/src/main/resources/templates/index.html
@@ -5,9 +5,10 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>DataDash</title>
     <link rel="stylesheet" href="main.css">
+    <script type="module"  src="main.js" defer></script>
 </head>
 <body>
-    <div onclick="console.log('add')" id="add-btn" title="Add a new API entry"></div>
+    <div id="add-btn" title="Add a new API entry"></div>
     <main>
         <header>
             <h1>Welcome to DataDash</h1>
@@ -16,17 +17,23 @@
 
         <section id="tool-bar">
             <select id="sort-btn" class="btn flat" title="Sort entries">Sort by
-                <option>Option 1</option>
-                <option>Option 2</option>
+                <option>Author A-Z</option>
+                <option>Author Z-A</option>
+                <option>Title A-Z</option>
+                <option>Title Z-A</option>
+                <option>Stars ↑</option>
+                <option>Stars ↓</option>
+                <option>Votes ↑</option>
+                <option>Votes ↓</option>
             </select>
             <div class="divider"></div>
             <select class="btn flat" id="filter-btn" title="Filter entries">Filter
                 <optgroup label="Standard categories">
-                    <option>Option 1</option>
-                    <option>Option 2</option>
+                    <option>Dataset</option>
+                    <option>API</option>
                 </optgroup>
-                <optgroup label="User categories">
-                    <option>user category</option>
+                <optgroup label="Other categories">
+                    <option>a category</option>
                 </optgroup>
             </select>
             <input type="search" name="query" id="search-entry" placeholder="Search">
@@ -37,7 +44,7 @@
             <h2>Recently added:</h2>
             <ul class="datasets">
                 <!-- Preliminary content to be replaced by data from our server: -->
-                <li class="dataset">
+                <li class="dataset" data-id="">
                     <div class="dataset-info">
                         <div class="icon standup"></div>
                         <div class="details">