diff --git a/apps/demo/src/lib/layouts/Default.svelte b/apps/demo/src/lib/layouts/Default.svelte
index bec27b9..d1ecf37 100644
--- a/apps/demo/src/lib/layouts/Default.svelte
+++ b/apps/demo/src/lib/layouts/Default.svelte
@@ -3,7 +3,7 @@
 </script>
 
 <svelte:head>
-    <title>svelte-markdoc-preprocess{title ? ` | ${title}` : ''}</title>
+    <title>{title ? `${title} | ` : ''}svelte-markdoc-preprocess</title>
     <meta
         name="description"
         content="A Svelte preprocessor that brings the power of Markdoc right into your Svelte applications!"
diff --git a/apps/demo/src/routes/documentation/+layout.svelte b/apps/demo/src/routes/documentation/+layout.svelte
index 379eeec..c0bb036 100644
--- a/apps/demo/src/routes/documentation/+layout.svelte
+++ b/apps/demo/src/routes/documentation/+layout.svelte
@@ -9,6 +9,11 @@
             name: 'Install',
             is_selected: $page.url.pathname === '/documentation',
         },
+        {
+            path: '/documentation/configuration',
+            name: 'Configuration',
+            is_selected: $page.url.pathname === '/documentation/configuration',
+        },
         {
             path: '/documentation/nodes',
             name: 'Nodes',
diff --git a/apps/demo/src/routes/documentation/configuration/+page.markdoc b/apps/demo/src/routes/documentation/configuration/+page.markdoc
new file mode 100644
index 0000000..495e63d
--- /dev/null
+++ b/apps/demo/src/routes/documentation/configuration/+page.markdoc
@@ -0,0 +1,78 @@
+---
+title: Configuration
+---
+
+## Usage
+
+You can pass the configuration to the preprocessor in the `svelte.config.js` like this:
+
+```js
+import { markdoc } from 'svelte-markdoc-preprocess';
+
+const config = {
+    preprocess: [
+        vitePreprocess(),
+        markdoc({
+          // configuration here
+        })
+    ]
+};
+```
+
+## Options
+
+#### `extensions`
+
+**Type**: `string[]`
+
+**Default**: `['.markdoc', '.mdoc', '.markdown', '.md']`
+
+Extensions to be processed.
+
+#### `nodes`
+
+**Type**: `string | null`
+
+**Default**: `null`
+
+Absoulute path to the `.svelte` file exporting components for nodes.
+
+#### tags
+
+**Type**: `string | null`
+
+**Default**: `null`
+
+Absoulute path to the `.svelte` file exporting components for tags.
+
+#### partials
+
+**Type**: `string`
+
+**Default**: `null`
+
+Absoulute path to the folder for partials.
+
+#### generateSchema
+
+**Type**: `boolean`
+
+**Default**: `true`
+
+Generate schema files under `./svelte-kit/markdoc-schema.json` to be used with the official [Visual Studio Code extension](https://marketplace.visualstudio.com/items?itemName=Stripe.markdoc-language-support).
+
+#### layouts
+
+**Type**: `Record<string, string> | null`
+
+**Default**: `null`
+
+Layouts to be used for pages.
+
+#### validationThreshold
+
+**Type**: `"error" | "debug" | "info" | "warning" | "critical"`
+
+**Default**: `error`
+
+The threshold for validation errors to stop the build.
diff --git a/packages/process/.npmignore b/packages/process/.npmignore
index 4061877..e23f153 100644
--- a/packages/process/.npmignore
+++ b/packages/process/.npmignore
@@ -1,3 +1,3 @@
-tests/**/*.test.mjs
+tests/
 tsconfig.json
 .prettierrc
diff --git a/packages/process/src/config.ts b/packages/process/src/config.ts
index 7a47e3d..5dd9875 100644
--- a/packages/process/src/config.ts
+++ b/packages/process/src/config.ts
@@ -1,4 +1,4 @@
-import { ConfigType } from '@markdoc/markdoc';
+import { ConfigType, ValidateError } from '@markdoc/markdoc';
 
 export type Config = {
     /**
@@ -28,6 +28,10 @@ export type Config = {
         default: string;
         [key: string]: string;
     } | null;
+    /**
+     * The threshold for validation errors to stop the build.
+     */
+    validationThreshold: ValidateError['error']['level'] | null;
     /**
      * Configuration for the markdoc compiler.
      */
diff --git a/packages/process/src/log.ts b/packages/process/src/log.ts
index 748c184..96d1b51 100644
--- a/packages/process/src/log.ts
+++ b/packages/process/src/log.ts
@@ -27,7 +27,6 @@ export function log_validation_error(
         case 'error':
         case 'critical':
             Logger.error(prefix, error.message);
-            throw new Error(error.message);
     }
 }
 
diff --git a/packages/process/src/processor.ts b/packages/process/src/processor.ts
index a2bfb2f..34eb07c 100644
--- a/packages/process/src/processor.ts
+++ b/packages/process/src/processor.ts
@@ -10,6 +10,7 @@ const default_config: Config = {
     tags: null,
     partials: null,
     config: null,
+    validationThreshold: 'error',
 };
 
 const processor = ({
@@ -20,6 +21,7 @@ const processor = ({
     tags = default_config.tags,
     partials = default_config.partials,
     config = default_config.config,
+    validationThreshold = default_config.validationThreshold,
 }: Config = default_config): PreprocessorGroup => {
     return {
         name: 'svelte-markdoc-preprocess',
@@ -45,6 +47,7 @@ const processor = ({
                 nodes_file: nodes,
                 tags_file: tags,
                 partials_dir: partials,
+                validation_threshold: validationThreshold,
             });
 
             return {
diff --git a/packages/process/src/transformer.ts b/packages/process/src/transformer.ts
index 4574d6d..0a056f9 100644
--- a/packages/process/src/transformer.ts
+++ b/packages/process/src/transformer.ts
@@ -47,6 +47,7 @@ export function transformer({
     layouts,
     generate_schema,
     config,
+    validation_threshold,
 }: {
     content: string;
     filename: string;
@@ -56,6 +57,7 @@ export function transformer({
     layouts: Config['layouts'];
     generate_schema: Config['generateSchema'];
     config: Config['config'];
+    validation_threshold: Config['validationThreshold'];
 }): string {
     /**
      * create ast for markdoc
@@ -84,7 +86,7 @@ export function transformer({
     let dependencies = '';
     const tags = prepare_tags(tags_file);
     const has_tags = Object.keys(tags).length > 0;
-    const nodes = prepare_nodes(nodes_file, dependencies);
+    const nodes = prepare_nodes(nodes_file);
     const has_nodes = Object.keys(nodes).length > 0;
     const partials = prepare_partials(partials_dir);
 
@@ -152,9 +154,21 @@ export function transformer({
     /**
      * validate markdoc asd and log errors, warnings & co
      */
+    const thresholds = new Map<Config['validationThreshold'], number>([
+        ['debug', 0],
+        ['info', 1],
+        ['warning', 2],
+        ['error', 3],
+        ['critical', 4],
+    ]);
+    const threshold = thresholds.get(validation_threshold);
     const errors = validate(ast, configuration);
     for (const error of errors) {
         log_validation_error(error, filename);
+        const level = thresholds.get(error.error.level);
+        if (threshold && level && level >= threshold) {
+            throw new Error(error.error.message);
+        }
     }
 
     /**
@@ -358,7 +372,6 @@ function get_node_defaults(node_type: NodeType): Partial<Schema> {
 
 function prepare_nodes(
     nodes_file: Config['nodes'],
-    dependencies: string,
 ): Partial<Record<NodeType, Schema>> {
     const nodes: Record<string, Schema> = {};
     if (nodes_file) {
diff --git a/packages/process/tests/processor.test.mjs b/packages/process/tests/processor.test.mjs
index 63341fe..0f7aefa 100644
--- a/packages/process/tests/processor.test.mjs
+++ b/packages/process/tests/processor.test.mjs
@@ -68,16 +68,24 @@ test('preprocessor', async (context) => {
     await Promise.all(
         files.map(async (entry) => {
             return context.test('tests ' + basename(entry), async () => {
-                const before = await read_file(join(entry, 'source.markdoc'));
-                const after = await read_file(join(entry, 'compiled.txt'));
-                const preprocess = await import(
-                    '../' + join(entry, 'config.mjs')
-                ).then((m) => m.default);
-                const markup = await preprocess.markup({
-                    content: before,
-                    filename: 'test.markdoc',
-                });
-                assert.equal(markup.code, after);
+                const before = read_file(join(entry, 'source.markdoc'));
+                const after = read_file(join(entry, 'compiled.txt'));
+                const config = await import('../' + join(entry, 'config.mjs'));
+                const preprocess = config.default;
+                const exception = config.exception ?? false;
+                try {
+                    const markup = await preprocess.markup({
+                        content: before,
+                        filename: 'test.markdoc',
+                    });
+                    assert.equal(markup.code, after);
+                } catch (error) {
+                    if (exception) {
+                        assert.equal(error.message, exception);
+                    } else {
+                        throw error;
+                    }
+                }
             });
         }),
     );
diff --git a/packages/process/tests/processor/validation threshold/compiled.txt b/packages/process/tests/processor/validation threshold/compiled.txt
new file mode 100644
index 0000000..e69de29
diff --git a/packages/process/tests/processor/validation threshold/config.mjs b/packages/process/tests/processor/validation threshold/config.mjs
new file mode 100644
index 0000000..3c169cc
--- /dev/null
+++ b/packages/process/tests/processor/validation threshold/config.mjs	
@@ -0,0 +1,5 @@
+import { markdoc } from '../../../dist/module.js';
+
+export default markdoc();
+
+export const exception = "Undefined tag: 'unknown_component'";
diff --git a/packages/process/tests/processor/validation threshold/source.markdoc b/packages/process/tests/processor/validation threshold/source.markdoc
new file mode 100644
index 0000000..3986f20
--- /dev/null
+++ b/packages/process/tests/processor/validation threshold/source.markdoc	
@@ -0,0 +1 @@
+{% unknown_component /%}