diff --git a/src/main/resources/static/add.css b/src/main/resources/static/add.css
index e4cc24d..3946f18 100644
--- a/src/main/resources/static/add.css
+++ b/src/main/resources/static/add.css
@@ -171,3 +171,30 @@ form :has(#url) {
 .btn:disabled {
     filter: var(--drop-shadow) grayscale(.5) brightness(.5);
 }
+
+#category[value="new"] {
+    display: none;
+}
+
+label[for="category"] {
+    width: 0;
+    user-select: none;
+    overflow: hidden;
+}
+
+span:has(#category) {
+    gap: unset;
+}
+
+#new-category-group:not(.hidden) {
+    display: flex;
+    justify-content: stretch;
+    gap: var(--gap-small);
+    width: 100%;
+}
+
+#new-category-group button {
+    background-image: url("./sort.svg");
+    background-size: contain;
+    background-origin: content-box;
+}
diff --git a/src/main/resources/static/add.html b/src/main/resources/static/add.html
index 30888c3..3c9f9c8 100644
--- a/src/main/resources/static/add.html
+++ b/src/main/resources/static/add.html
@@ -27,7 +27,7 @@
                 </span>
 
                 <span id="author-box">
-                    <label for="author">Author</label>
+                    <label for="author">Author/provider</label>
                     <input type="text" name="author" id="author" required>
                 </span>
 
@@ -48,6 +48,29 @@
                     <input type="url" name="url" id="url" required>
                 </span>
 
+                <span>
+                    <label for="terms-of-use">Terms of Use URL</label>
+                    <input type="url" name="terms-of-use" id="terms-of-use" required>
+                </span>
+
+                <span>
+                    <label for="license">License</label>
+                    <input type="text" name="license" id="license" required>
+                </span>
+
+                <span>
+                    <label for="category">Category</label>
+                    <select name="category" id="category" class="btn" required autocomplete="off">
+                        <option value="" selected disabled hidden>Category</option>
+                        <option value="new">New category</option>
+                        <hr>
+                    </select>
+                    <span id="new-category-group" class="hidden">
+                        <input type="text" id="new-category" size="2" required disabled autocomplete="off">
+                        <button id="change-category-btn" class="btn flat" title="change category"></button>
+                    </span>
+                </span>
+
                 <span id="full-description-box">
                     <label for="full-description">Full description</label>
                     <textarea name="full-description" id="full-description" spellcheck="true"></textarea>
diff --git a/src/main/resources/static/add.js b/src/main/resources/static/add.js
index 53292ad..819e55e 100644
--- a/src/main/resources/static/add.js
+++ b/src/main/resources/static/add.js
@@ -7,10 +7,16 @@ const {
     ["is-dataset"]: isDatasetSwitch,
     ["short-description"]: shortDescriptionEntry,
     url: urlEntry,
+    ["terms-of-use"]: termsOfUseEntry,
+    license: licenseEntry,
+    category: categorySpinner,
+    ["new-category"]: newCategoryEntry,
+    ["change-category-btn"]: changeCategoryBtn,
     ["full-description"]: fullDescriptionEntry,
     ["btn-add"]: addBtn,
     ["btn-cancel"]: cancelBtn,
 } = form.elements;
+const newCategoryGroup = document.getElementById("new-category-group");
 
 const validationListener = () => {
     addBtn.disabled = !form.checkValidity();
@@ -22,44 +28,127 @@ const validationListener = () => {
     authorEntry,
     shortDescriptionEntry,
     urlEntry,
+    termsOfUseEntry,
+    licenseEntry,
+    newCategoryEntry,
     fullDescriptionEntry,
 ].forEach(input => input.addEventListener("input", validationListener));
 
+// Category spinner
+const categorySpinnerSet = (...args) => {
+    if (args.length > 0) {
+        categorySpinner.value = args[0];
+    }
+
+    categorySpinner.setAttribute("value", categorySpinner.value);
+
+    if (categorySpinner.value == "new") {
+        newCategoryGroup.classList.remove("hidden");
+        newCategoryEntry.disabled = false;
+        newCategoryEntry.focus();
+    } else {
+        newCategoryGroup.classList.add("hidden");
+        newCategoryEntry.disabled = true;
+    }
+};
+
+const getCategory = () => {
+    return categorySpinner.value == "new"
+        ? newCategoryEntry.value
+        : categorySpinner.value;
+}
+
+categorySpinner.addEventListener("input", e => {
+    categorySpinnerSet();
+    validationListener();
+});
+
+changeCategoryBtn.addEventListener("click", e => {
+    e.preventDefault();
+    categorySpinnerSet("");
+    validationListener();
+});
+
+let categoriesResponse = await fetch(`${location.origin}/api/v1/categories`);
+let categories = [];
+if (!categoriesResponse.ok) {
+    console.warn("Could not load categories!");
+} else {
+    categories = await categoriesResponse.json();
+    for (const category of categories) {
+        let option = document.createElement("option");
+        option.value = category.id;
+        option.text = category.name;
+        categorySpinner.add(option);
+    }
+}
+
+// Form listeners
 cancelBtn.addEventListener("click", () => {
     window.location.href = location.origin;
 })
 
 form.addEventListener("submit", async e => {
     e.preventDefault();
-    if (!form.reportValidity()) return;
+    if (!form.reportValidity()) {
+        addBtn.disabled = true;
+        return;
+    }
+
+    let categoryID = categorySpinner.value;
+
+    if (categoryID == "new") {
+        const newCategoryName = newCategoryEntry.value.trim();
+
+        if (!categories.map(c => c.name).includes(newCategoryName)) {
+            // Try to add the new category
+            const newCategoryResponse = await fetch(`/api/v1/categories`, {
+                method: "POST",
+                headers: { "Content-Type": "application/json;charset=utf-8" },
+                body: JSON.stringify({ name: newCategoryName }),
+            });
+
+            if (!newCategoryResponse.ok) {
+                newCategoryEntry.setCustomValidity(
+                    `Could not create new category: ${newCategoryResponse.statusText}`
+                );
+                form.reportValidity();
+                return;
+            }
+
+            const newCategory = await newCategoryResponse.json();
+            categoryID = newCategory.id;
+        }
+    }
 
     // Create the request body
     const newContent = {
         title: titleEntry.value,
         author: authorEntry.value,
+        type: isDatasetSwitch.checked ? "API" : "DATASET",
         abst: shortDescriptionEntry.value,
         url: urlEntry.value,
+        termsOfUse: termsOfUseEntry.value,
+        licence: licenseEntry.value,
+        categorie: {
+            id: categoryID,
+        },
         description: fullDescriptionEntry.value,
-        type: isDatasetSwitch.checked ? "API" : "DATASET",
-        categories: [],
     };
 
-    console.debug(newContent);
-
     // Don't allow several requests to be sent at the same time
     addBtn.disabled = true;
 
     let response = await fetch("/api/v1/datasets", {
         method: "POST",
+        headers: { "Content-Type": "application/json;charset=utf-8" },
         body: JSON.stringify(newContent),
-        headers: {
-            "Content-Type": "application/json;charset=utf-8"
-        }
-
     });
     let data = await response.json();
+
     let dataset = new Dataset(data);
     dataset.storageSetKey("created-locally", true);
+
     if (response.ok) {
         location.assign("/");
     } else {
diff --git a/src/main/resources/static/dataset.js b/src/main/resources/static/dataset.js
index e7f0934..87984cd 100644
--- a/src/main/resources/static/dataset.js
+++ b/src/main/resources/static/dataset.js
@@ -23,7 +23,7 @@ export default class Dataset {
         return this.#datasets.get(id);
     }
 
-    constructor({ abst: shortDescription, author, categorie, date, description, id, raiting, title, type, upvotes, url, votes, license, termsOfUse }) {
+    constructor({ abst: shortDescription, author, categorie, date, description, id, raiting, title, type, upvotes, url, votes, licence: license, termsOfUse }) {
         this.#shortDescription = shortDescription;
         this.#author = author;
         this.#category = categorie;
diff --git a/src/main/resources/static/details.js b/src/main/resources/static/details.js
index e770a5c..8c07154 100644
--- a/src/main/resources/static/details.js
+++ b/src/main/resources/static/details.js
@@ -18,12 +18,10 @@ const currentLocation = new URL(location.href);
 if (currentLocation.searchParams.has("id")) {
     const id = currentLocation.searchParams.get("id");
     const response = await fetch(`${currentLocation.origin}/api/v1/datasets/id/${id}`);
-    console.dir(response);
 
     if (response.ok) {
         const data = await response.json();
         const dataset = new Dataset(data);
-        console.dir(data, dataset);
         const upvoteComponent = dataset.createUpvoteComponent();
 
         title.innerText = dataset.title;