diff --git a/src/nginxconfig/templates/app.vue b/src/nginxconfig/templates/app.vue
index 8299f80..0544a2e 100644
--- a/src/nginxconfig/templates/app.vue
+++ b/src/nginxconfig/templates/app.vue
@@ -26,7 +26,7 @@ limitations under the License.
             </template>
         </Header>
 
-        <div class="main container">
+        <div class="main container" :style="{ display: ready ? undefined : 'none' }">
             <h2>Per-website config</h2>
 
             <div class="tabs">
@@ -46,7 +46,7 @@ limitations under the License.
             <template v-for="data in activeDomains">
                 <Domain :key="data[1]"
                         :data="data[0]"
-                        :style="{ display: data[1] === active ? 'block' : 'none' }"
+                        :style="{ display: data[1] === active ? undefined : 'none' }"
                 ></Domain>
             </template>
 
@@ -66,6 +66,8 @@ limitations under the License.
     import Footer from 'do-vue/src/templates/footer';
     import isChanged from '../util/is_changed';
     import exportData from '../util/export_data';
+    import importData from '../util/import_data';
+    import isObject from '../util/is_object';
     import i18n from '../i18n';
     import Domain from './domain';
     import Global from './global';
@@ -81,11 +83,10 @@ limitations under the License.
         data() {
             return {
                 i18n,
-                domains: [
-                    clone(Domain.delegated),
-                ],
+                domains: [],
                 global: Global.delegated,
                 active: 0,
+                ready: false,
             };
         },
         computed: {
@@ -96,11 +97,26 @@ limitations under the License.
                 return JSON.stringify(exportData(this.activeDomains, this.$data.global), null, 2);
             },
         },
+        mounted() {
+            // If there is no query param, add one default domain and we're ready
+            if (!window.location.search.length) {
+                this.$data.domains.push(clone(Domain.delegated));
+                this.$data.ready = true;
+                return;
+            }
+
+            // Import any data from the URL query params
+            importData(window.location.search, this.$data.domains, this.$data.global, this.$nextTick);
+
+            // After two ticks (one tick to set watched data), we are ready
+            this.$nextTick(() => this.$nextTick(() => this.$data.ready = true));
+        },
         methods: {
             changes(index) {
                 const data = this.$data.domains[index];
                 const changes = Object.entries(data).reduce((prev, current) => {
                     if (current[0] === 'presets') return prev; // Ignore changes from presets
+                    if (!isObject(current[1])) return prev; // Ignore non-objects (things that aren't tabs)
                     prev += Object.keys(current[1]).filter(key => isChanged(current[1][key], current[0], key)).length;
                     return prev;
                 }, 0);
diff --git a/src/nginxconfig/templates/domain.vue b/src/nginxconfig/templates/domain.vue
index 1675e76..2eacdda 100644
--- a/src/nginxconfig/templates/domain.vue
+++ b/src/nginxconfig/templates/domain.vue
@@ -33,7 +33,7 @@ limitations under the License.
                        v-for="tab in tabs"
                        :key="tab.key"
                        :data="$props.data[tab.key]"
-                       :style="{ display: active === tab.key ? 'block' : 'none' }"
+                       :style="{ display: active === tab.key ? undefined : 'none' }"
                        class="container"
             ></component>
 
@@ -56,6 +56,7 @@ limitations under the License.
 
     const tabs = Object.values(Sections);
     const delegated = {
+        hasUserInteraction: false,
         presets: Presets.delegated,
         ...tabs.reduce((prev, tab) => {
             prev[tab.key] = tab.delegated;
@@ -65,10 +66,10 @@ limitations under the License.
 
     export default {
         name: 'Domain',
-        delegated,
+        delegated,          // Data the parent will present here
         components: {
             Presets,
-        },          // Data the parent will present here
+        },
         props: {
             data: Object,   // Data delegated back to us from parent
         },
@@ -76,7 +77,6 @@ limitations under the License.
             return {
                 active: tabs[0].key,
                 tabs,
-                hasUserInteraction: false,
             };
         },
         computed: {
diff --git a/src/nginxconfig/templates/domain_sections/presets.vue b/src/nginxconfig/templates/domain_sections/presets.vue
index 581f777..b95ec3e 100644
--- a/src/nginxconfig/templates/domain_sections/presets.vue
+++ b/src/nginxconfig/templates/domain_sections/presets.vue
@@ -2,7 +2,7 @@
     <div class="container">
         <div class="header-group">
             <h3>Presets</h3>
-            <template v-if="$parent.$data.hasUserInteraction">
+            <template v-if="$parent.$props.data.hasUserInteraction">
                 <a v-if="expanded" class="button is-tiny" @click="expanded = false">
                     <i class="fas fa-angle-up"></i>
                 </a>
@@ -12,8 +12,8 @@
             </template>
         </div>
 
-        <template v-if="!$parent.$data.hasUserInteraction || expanded">
-            <div v-if="$parent.$data.hasUserInteraction" class="message is-warning">
+        <template v-if="!$parent.$props.data.hasUserInteraction || expanded">
+            <div v-if="$parent.$props.data.hasUserInteraction" class="message is-warning">
                 <div class="message-body">
                     It looks like you've customised the configuration for this domain.
                     Choosing a new preset may reset or change some of the settings that you've customised.
diff --git a/src/nginxconfig/templates/global.vue b/src/nginxconfig/templates/global.vue
index 43c216d..36f08c0 100644
--- a/src/nginxconfig/templates/global.vue
+++ b/src/nginxconfig/templates/global.vue
@@ -28,7 +28,7 @@ limitations under the License.
                    v-for="tab in tabs"
                    :key="tab.key"
                    :data="$props.data[tab.key]"
-                   :style="{ display: active === tab.key ? 'block' : 'none' }"
+                   :style="{ display: active === tab.key ? undefined : 'none' }"
                    class="container"
         ></component>
 
diff --git a/src/nginxconfig/util/computed_from_defaults.js b/src/nginxconfig/util/computed_from_defaults.js
index c1e4952..9161cdc 100644
--- a/src/nginxconfig/util/computed_from_defaults.js
+++ b/src/nginxconfig/util/computed_from_defaults.js
@@ -10,10 +10,11 @@ export default (defaults, cat, isInteraction = true) => {
                 // Save user interaction if value changed
                 if (isInteraction
                     && this.$parent
-                    && 'hasUserInteraction' in this.$parent.$data
-                    && !this.$parent.$data.hasUserInteraction
+                    && 'data' in this.$parent.$props
+                    && 'hasUserInteraction' in this.$parent.$props.data
+                    && !this.$parent.$props.data.hasUserInteraction
                     && this.$props.data[key].value !== value)
-                        this.$parent.$data.hasUserInteraction = true;
+                        this.$parent.$props.data.hasUserInteraction = true;
 
                 this.$props.data[key].value = value;
                 this.$props.data[key].computed = value;
diff --git a/src/nginxconfig/util/export_data.js b/src/nginxconfig/util/export_data.js
index ffc9728..c5ae9cd 100644
--- a/src/nginxconfig/util/export_data.js
+++ b/src/nginxconfig/util/export_data.js
@@ -3,6 +3,8 @@ const categoriesExport = (categories) => {
 
     // Work through each category
     for (const category in categories) {
+        // Ignore presets
+        if (category === 'presets') continue;
         const categoryData = {};
 
         // Go over each property in the category
diff --git a/src/nginxconfig/util/import_data.js b/src/nginxconfig/util/import_data.js
new file mode 100644
index 0000000..9a85dfb
--- /dev/null
+++ b/src/nginxconfig/util/import_data.js
@@ -0,0 +1,79 @@
+import qs from 'qs';
+import clone from 'clone';
+import Domain from '../templates/domain';
+import isObject from './is_object';
+
+export default (query, domains, global, nextTick) => {
+    const data = qs.parse(query, {
+        ignoreQueryPrefix: true,
+        allowDots: true,
+        decoder(value) {
+            // If it's a set of digits, parse it as a float
+            if (/^(\d+|\d*\.\d+)$/.test(value)) {
+                return parseFloat(value);
+            }
+
+            // If it matches a keyword, convert it
+            let keywords = {
+                true: true,
+                false: false,
+                null: null,
+                undefined: undefined,
+            };
+            if (value in keywords) {
+                return keywords[value];
+            }
+
+            // Otherwise, leave it as is
+            return value;
+        },
+    });
+
+    // Handle domains
+    if ('domains' in data) {
+        // Check its an array or object
+        if (Array.isArray(data.domains) || isObject(data.domains)) {
+            // Ensure we're working with an array
+            const values = isObject(data.domains) ? Object.values(data.domains) : data.domains;
+
+            // Work through each potential domain
+            for (const domainData of values) {
+                // Check this is an object
+                if (!isObject(domainData)) continue;
+
+                // Create a new domain (assume it has had custom user settings)
+                const domainImported = clone(Domain.delegated);
+                domainImported.hasUserInteraction = true;
+                domains.push(domainImported);
+
+                // Apply the initial values on the next Vue tick, once the watchers are ready
+                nextTick(() => {
+                    // Work through each potential category
+                    for (const category in domainData) {
+                        // Ignore presets
+                        if (category === 'presets') continue;
+
+                        // Check this is a real category
+                        if (!(category in domainImported)) continue;
+
+                        // Check this is an object
+                        if (!isObject(domainData[category])) continue;
+
+                        // Work through each potential setting in this category
+                        for (const key in domainData[category]) {
+                            // Check this is a real key
+                            if (!(key in domainImported[category])) continue;
+
+                            // Apply the value
+                            domainImported[category][key].value = domainData[category][key];
+                            domainImported[category][key].computed = domainData[category][key];
+                        }
+                    }
+                });
+            }
+        }
+    }
+
+    // Handle global settings
+    // TODO
+};
diff --git a/src/nginxconfig/util/is_object.js b/src/nginxconfig/util/is_object.js
new file mode 100644
index 0000000..5eb6813
--- /dev/null
+++ b/src/nginxconfig/util/is_object.js
@@ -0,0 +1 @@
+export default obj => Object.prototype.toString.call(obj) === '[object Object]';