Structured data testing tools are extremely useful because they provide important information about the implementation of structured data in your web pages. They present a picture of how search engines read this data and whether it qualifies for Rich Results.
In fact, each testing tool is different and can help you improve your structured data through several features.
The listed structured data testing tools deserve your attention.
SEO Site Checkup
Yandex Structured Data Validator
Bing Markup Validator
Structured Data Linter
To test your website's structured data, you can use the tool: https://validator.schema.org/
To validate your structured data, it is a good practice to review the visualization with Google Search using: https://search.google.com/test/rich-results