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You can choose to validate JSON documents at any time by using the manual validation actions that are available in Oxygen XML Developer.

Manual Validation Actions

To manually validate the currently edited document, use one of the following actions:

Validate (Ctrl + Shift + V (Command + Shift + V on OS X))
Available from the Validation drop-down menu on the toolbar, the Document > Validate menu, or from the Validate submenu when invoking the contextual menu in the Project view.
Validate with

Available from the Validation drop-down menu on the toolbar or the Document > Validate menu.

This action opens a dialog box that allows you to specify a schema for validating the current document.

Note: The Validate with action does not work for files loaded through a custom protocol plugin developed independently and added to Oxygen XML Developer after installation.
Validate with Schema

Available from the Validate submenu when invoking the contextual menu in the Project view.

This action opens a dialog box that allows you to specify a JSON or Schematron schema for validating the current document.

Other Validation Options

Tip: If a large number of validation errors are detected and the validation process takes too long, you can limit the maximum number of reported errors in the Document Checking preferences page.