vogievetsky commented on a change in pull request #7242: [Console] Add 
compaction dialog in druid console which allows users to add/edit data source 
compaction configuration
URL: https://github.com/apache/incubator-druid/pull/7242#discussion_r265858457
 
 

 ##########
 File path: web-console/src/components/filler.tsx
 ##########
 @@ -257,3 +259,63 @@ export class TagInput extends 
React.Component<TagInputProps, { stringValue: stri
     />;
   }
 }
+
+interface JSONInputProps extends React.Props<any>{
+  onChange: (newValue: string) => void;
+  value: JSON;
+  updateErrors: ((newValue: string) => void)
+}
+
+interface JSONInputState{
+  stringValue: string;
+}
+
+export class JSONInput extends React.Component<JSONInputProps, JSONInputState> 
{
+  constructor(props: JSONInputProps) {
+    super(props);
+    this.state = {
+      stringValue: ""
+    }
+  }
+
+  componentDidMount(): void {
+    const { value } = this.props;
+    const stringValue = parseJSONToString(value);
+    this.setState({
+      stringValue: stringValue
+    })
+  }
 
 Review comment:
   you need to also implement a `getDerivedStateFromProps` because if the props 
change the state (stringValue) will not currently be updated
   

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