diff --git a/packages/form-json-schema/src/defs/field-types/inputs.json b/packages/form-json-schema/src/defs/field-types/inputs.json
index 75148ef7d..483ef8779 100644
--- a/packages/form-json-schema/src/defs/field-types/inputs.json
+++ b/packages/form-json-schema/src/defs/field-types/inputs.json
@@ -11,7 +11,8 @@
         "taglist",
         "textfield",
         "textarea",
-        "expression"
+        "expression",
+        "script"
       ]
     }
   },
diff --git a/packages/form-json-schema/src/defs/rules/rules-required-properties.json b/packages/form-json-schema/src/defs/rules/rules-required-properties.json
index 08f2fd7e8..c1767ab97 100644
--- a/packages/form-json-schema/src/defs/rules/rules-required-properties.json
+++ b/packages/form-json-schema/src/defs/rules/rules-required-properties.json
@@ -49,6 +49,46 @@
           "computeOn"
         ]
       }
+    },
+    {
+      "if": {
+        "properties": {
+          "type": {
+            "const": "script"
+          }
+        },
+        "required": [
+          "type"
+        ]
+      },
+      "then": {
+        "allOf": [
+          {
+            "required": [
+              "jsFunction",
+              "functionParameters",
+              "computeOn"
+            ]
+          },
+          {
+            "if": {
+              "properties": {
+                "computeOn": {
+                  "const": "interval"
+                }
+              },
+              "required": [
+                "computeOn"
+              ]
+            },
+            "then": {
+              "required": [
+                "interval"
+              ]
+            }
+          }
+        ]
+      }
     }
   ]
 }
diff --git a/packages/form-json-schema/src/defs/type.json b/packages/form-json-schema/src/defs/type.json
index edd87a18b..097ad54b4 100644
--- a/packages/form-json-schema/src/defs/type.json
+++ b/packages/form-json-schema/src/defs/type.json
@@ -22,6 +22,7 @@
     "separator",
     "table",
     "iframe",
-    "expression"
+    "expression",
+    "script"
   ]
 }
\ No newline at end of file
diff --git a/packages/form-json-schema/test/fixtures/js-interval-no-interval.js b/packages/form-json-schema/test/fixtures/js-interval-no-interval.js
new file mode 100644
index 000000000..7787120c3
--- /dev/null
+++ b/packages/form-json-schema/test/fixtures/js-interval-no-interval.js
@@ -0,0 +1,43 @@
+export const form = {
+  type: 'default',
+  'components': [
+    {
+      type: 'script',
+      key: 'myField',
+      jsFunction: 'return 42',
+      functionParameters: '={\n  value: 42\n}',
+      computeOn: 'interval'
+    }
+  ]
+};
+
+export const errors = [
+  {
+    instancePath: '/components/0',
+    keyword: 'required',
+    message: "must have required property 'interval'",
+    params: {
+      missingProperty: 'interval'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/then/allOf/1/then/required'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'if',
+    message: 'must match "then" schema',
+    params: {
+      failingKeyword: 'then'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/then/allOf/1/if'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'if',
+    message: 'must match "then" schema',
+    params: {
+      failingKeyword: 'then'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/if'
+  }
+];
+
diff --git a/packages/form-json-schema/test/fixtures/js-no-props.js b/packages/form-json-schema/test/fixtures/js-no-props.js
new file mode 100644
index 000000000..669361edf
--- /dev/null
+++ b/packages/form-json-schema/test/fixtures/js-no-props.js
@@ -0,0 +1,67 @@
+export const form = {
+  type: 'default',
+  'components': [
+    {
+      type: 'script',
+    }
+  ]
+};
+
+export const errors = [
+  {
+    instancePath: '/components/0',
+    keyword: 'required',
+    message: "must have required property 'key'",
+    params: {
+      missingProperty: 'key'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/0/then/required'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'if',
+    message: 'must match "then" schema',
+    params: {
+      failingKeyword: 'then'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/0/if'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'required',
+    message: "must have required property 'jsFunction'",
+    params: {
+      missingProperty: 'jsFunction'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/then/allOf/0/required'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'required',
+    message: "must have required property 'functionParameters'",
+    params: {
+      missingProperty: 'functionParameters'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/then/allOf/0/required'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'required',
+    message: "must have required property 'computeOn'",
+    params: {
+      missingProperty: 'computeOn'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/then/allOf/0/required'
+  },
+  {
+    instancePath: '/components/0',
+    keyword: 'if',
+    message: 'must match "then" schema',
+    params: {
+      failingKeyword: 'then'
+    },
+    schemaPath: '#/properties/components/items/allOf/0/allOf/3/if'
+  }
+];
+
+
diff --git a/packages/form-json-schema/test/spec/validation.spec.js b/packages/form-json-schema/test/spec/validation.spec.js
index 58d585907..7bae65ab0 100644
--- a/packages/form-json-schema/test/spec/validation.spec.js
+++ b/packages/form-json-schema/test/spec/validation.spec.js
@@ -110,9 +110,17 @@ describe('validation', function() {
 
   describe('rules - required properties', function() {
 
-
     testForm('no-key');
 
+
+    testForm('expression-field-expression-required');
+
+
+    testForm('js-interval-no-interval');
+
+
+    testForm('js-no-props');
+
   });
 
 
@@ -136,9 +144,6 @@ describe('validation', function() {
     testForm('disabled-not-allowed');
 
 
-    testForm('expression-field-expression-required');
-
-
     testForm('action-not-allowed');