diff --git a/packages/form-js-editor/test/spec/features/properties-panel/PropertiesPanel.spec.js b/packages/form-js-editor/test/spec/features/properties-panel/PropertiesPanel.spec.js
index f9157d738..77a8074e6 100644
--- a/packages/form-js-editor/test/spec/features/properties-panel/PropertiesPanel.spec.js
+++ b/packages/form-js-editor/test/spec/features/properties-panel/PropertiesPanel.spec.js
@@ -3538,7 +3538,43 @@ describe('properties panel', function() {
           'General': [
             'Key',
             'Target value',
-            'Compute on'
+            'Compute on',
+            "Do not submit the expression's result with the form submission"
+          ],
+          'Condition': [
+            'Deactivate if'
+          ],
+          'Layout': [
+            'Columns'
+          ],
+          'Custom properties': []
+        });
+
+      });
+
+    });
+
+
+    describe('js function field', function() {
+
+      it('entries', function() {
+
+        // given
+        const field = schema.components.find(({ type }) => type === 'script');
+
+        bootstrapPropertiesPanel({
+          container,
+          field
+        });
+
+        // then
+        expectPanelStructure(container, {
+          'General': [
+            'Key',
+            'Function parameters',
+            'Javascript code',
+            'Compute on',
+            "Do not submit the function's result with the form submission",
           ],
           'Condition': [
             'Deactivate if'
diff --git a/packages/form-js-editor/test/spec/form.json b/packages/form-js-editor/test/spec/form.json
index 62589717b..5fb0f3908 100644
--- a/packages/form-js-editor/test/spec/form.json
+++ b/packages/form-js-editor/test/spec/form.json
@@ -3,6 +3,15 @@
   "id": "Form_1",
   "type": "default",
   "components": [
+    {
+      "id": "Script_1",
+      "type": "script",
+      "key": "script",
+      "jsFunction": "return [\"reading\", \"swimming\", \"running\"];",
+      "functionParameters": "={}",
+      "computeOn": "interval",
+      "interval": 1000
+    },
     {
       "id": "ExpressionField_1",
       "type": "expression",
diff --git a/packages/form-js-playground/test/spec/form.json b/packages/form-js-playground/test/spec/form.json
index b507bed89..3daeef092 100644
--- a/packages/form-js-playground/test/spec/form.json
+++ b/packages/form-js-playground/test/spec/form.json
@@ -1,6 +1,14 @@
 {
   "$schema": "../../../form-json-schema/resources/schema.json",
   "components": [
+    {
+      "type": "script",
+      "key": "otherHobbies",
+      "jsFunction": "return [\"reading\", \"swimming\", \"running\"];",
+      "functionParameters": "={}",
+      "computeOn": "change",
+      "interval": 1000
+    },
     {
       "type": "expression",
       "key": "expressionResult",
diff --git a/packages/form-js-viewer/test/spec/render/components/form-fields/JSFunctionField.spec.js b/packages/form-js-viewer/test/spec/render/components/form-fields/JSFunctionField.spec.js
new file mode 100644
index 000000000..e15ca6398
--- /dev/null
+++ b/packages/form-js-viewer/test/spec/render/components/form-fields/JSFunctionField.spec.js
@@ -0,0 +1,163 @@
+import {
+  render
+} from '@testing-library/preact/pure';
+
+import { JSFunctionField } from '../../../../../src/render/components/form-fields/JSFunctionField';
+
+import { MockFormContext } from '../helper';
+
+import { act } from 'preact/test-utils';
+
+import {
+  createFormContainer
+} from '../../../../TestHelper';
+
+let container;
+
+describe('JSFunctionField', function() {
+
+  beforeEach(function() {
+    container = createFormContainer();
+  });
+
+
+  afterEach(function() {
+    container.remove();
+  });
+
+
+  it('should evaluate with setValue', async function() {
+
+    // given
+    const onChangeSpy = sinon.spy();
+    const field = defaultField;
+    const passedData = { value : 42 };
+
+    const services = {
+      expressionLanguage: {
+        isExpression: () => true,
+        evaluate: () => {
+          return passedData;
+        }
+      }
+    };
+
+    // when
+    act(() => {
+      createJSFunctionField({ field, onChange: onChangeSpy, services });
+    });
+
+    // wait for the iframe to compute the expression and pass it back
+    await new Promise(r => setTimeout(r, 100)).then(() => {
+
+      // then
+      expect(onChangeSpy).to.be.calledOnce;
+      expect(onChangeSpy).to.be.calledWith({ field, value: 42 });
+    });
+
+  });
+
+
+  it('should evaluate with return', async function() {
+
+    // given
+    const onChangeSpy = sinon.spy();
+    const field = {
+      ...defaultField,
+      jsFunction: 'return data.value'
+    };
+    const passedData = { value : 42 };
+
+    const services = {
+      expressionLanguage: {
+        isExpression: () => true,
+        evaluate: () => {
+          return passedData;
+        }
+      }
+    };
+
+    // when
+    act(() => {
+      createJSFunctionField({ field, onChange: onChangeSpy, services });
+    });
+
+    // wait for the iframe to compute the expression and pass it back
+    await new Promise(r => setTimeout(r, 100)).then(() => {
+
+      // then
+      expect(onChangeSpy).to.be.calledOnce;
+      expect(onChangeSpy).to.be.calledWith({ field, value: 42 });
+    });
+
+  });
+
+
+  it('should evaluate multiple times when using interval', async function() {
+
+    // given
+    const onChangeSpy = sinon.spy();
+    const field = {
+      ...defaultField,
+      computeOn: 'interval',
+      interval: 100
+    };
+    const passedData = { value : 42 };
+
+    const services = {
+      expressionLanguage: {
+        isExpression: () => true,
+        evaluate: () => {
+          return passedData;
+        }
+      }
+    };
+
+    // when
+    act(() => {
+      createJSFunctionField({ field, onChange: onChangeSpy, services });
+    });
+
+    // wait for the iframe to compute the expression and pass it back
+    await new Promise(r => setTimeout(r, 500)).then(() => {
+
+      // then
+
+      // deliberately underestimating the number of calls to account for potential timing issues
+      expect(onChangeSpy.callCount > 3).to.be.true;
+      expect(onChangeSpy).to.be.calledWith({ field, value: 42 });
+    });
+
+
+  });
+
+});
+
+// helpers //////////
+
+const defaultField = {
+  type: 'script',
+  key: 'jsfunction',
+  jsFunction: 'setValue(data.value)',
+  computeOn: 'load'
+};
+
+function createJSFunctionField({ services, ...restOptions } = {}) {
+  const options = {
+    field: defaultField,
+    onChange: () => {},
+    ...restOptions
+  };
+
+  return render(
+    <MockFormContext
+      services={ services }
+      options={ options }>
+      <JSFunctionField
+        field={ options.field }
+        onChange={ options.onChange } />
+    </MockFormContext>, {
+      container: options.container || container.querySelector('.fjs-form')
+    }
+  );
+}
\ No newline at end of file