fix: add condition to check type of property before parsing from json

packages/cli/generators/datasource/index.js

@@ -235,7 +235,9 @@ module.exports = class DataSourceGenerator extends ArtifactGenerator {
             if (props[key] == null || props[key] === '') {
               delete props[key];
             } else {
-              props[key] = JSON.parse(props[key]);
+              if (typeof props[key] === 'string') {
+                props[key] = JSON.parse(props[key]);
+              }
             }
             break;
         }

packages/cli/snapshots/integration/generators/datasource.integration.snapshots.js

@@ -146,6 +146,65 @@ export class DsDataSource extends juggler.DataSource
 
 `;
 
+exports[`lb4 datasource integration correctly coerces setting input of type object and array with config 1`] = `
+import {inject, lifeCycleObserver, LifeCycleObserver} from '@loopback/core';
+import {juggler} from '@loopback/repository';
+
+const config = {
+  name: 'ds',
+  connector: 'rest',
+  localConfigOnly: true,
+  sharedData: {},
+  forwardErrorToEnvironment: false,
+  skipInstall: true,
+  skipCache: true,
+  skipLocalCache: true,
+  force: true,
+  'skip-cache': true,
+  'skip-install': true,
+  resolved: '/home/aaqilniz/working-space/patrick/forked/loopback-next/packages/cli/generators/datasource/index.js',
+  namespace: 'home:aaqilniz:working-space:patrick:forked:loopback-next:packages:cli:datasource',
+  _: [],
+  config: '{"name":"ds","connector":"rest","options":"{\\"test\\": \\"value\\"}","operations":"[\\"get\\", \\"post\\"]"}',
+  yes: true,
+  'force-install': false,
+  'ask-answered': false,
+  c: '{"name":"ds","connector":"rest","options":"{\\"test\\": \\"value\\"}","operations":"[\\"get\\", \\"post\\"]"}',
+  y: [
+    '@@_YEOMAN_EMPTY_MARKER_@@',
+    true
+  ],
+  options: {
+    test: 'value'
+  },
+  operations: [
+    'get',
+    'post'
+  ],
+  baseURL: null,
+  crud: false
+};
+
+// Observe application's life cycle to disconnect the datasource when
+// application is stopped. This allows the application to be shut down
+// gracefully. The \`stop()\` method is inherited from \`juggler.DataSource\`.
+// Learn more at https://loopback.io/doc/en/lb4/Life-cycle.html
+@lifeCycleObserver('datasource')
+export class DsDataSource extends juggler.DataSource
+  implements LifeCycleObserver {
+  static dataSourceName = 'ds';
+  static readonly defaultConfig = config;
+
+  constructor(
+    @inject('datasources.config.ds', {optional: true})
+    dsConfig: object = config,
+  ) {
+    super(dsConfig);
+  }
+}
+
+`;
+
 
 exports[`lb4 datasource integration scaffolds correct file with cloudant input 1`] = `
 import {inject, lifeCycleObserver, LifeCycleObserver} from '@loopback/core';

packages/cli/test/integration/generators/datasource.integration.js

@@ -131,6 +131,19 @@ describe('lb4 datasource integration', () => {
 
     checkDataSourceFilesAgainstSnapshot();
   });
+
+  it('correctly coerces setting input of type object and array with config', async () => {
+    await testUtils
+      .executeGenerator(generator)
+      .inDir(sandbox.path, () => testUtils.givenLBProject(sandbox.path))
+      .withArguments([
+        '--config',
+        `${JSON.stringify(complexCLIInput)}`,
+        '--yes',
+      ]);
+
+    checkDataSourceFilesAgainstSnapshot();
+  });
 });
 
 function checkDataSourceFilesAgainstSnapshot() {