Flask v2.0 Release
Flask v2.x version summary
This page summarizes all updates provided by version 2.0 of Flask.
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Flask 2.0 highlights

Blueprints
Starting with 2.0 version Blueprints can be nested under each other. This feature might improve the design of complex products.
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Flask Shell
Tab completion is now supported for all registered entities (variables, classes)
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Config from file
Re-add deprecated Config.from_json, which was accidentally removed early.
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Improved CLI errors
When an app could not be loaded, errors are displayed instantly when the development server is active.
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FLASK_DEBUG is deprecated
Replaced by FLASK_ENV, a more current environment variable.
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Language Detection
langdetect package is used by default.
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Improved Static files cache - on development
Browsers will cache static files based on file content rather than a 12-hour refresh time frame.
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Free Starters upgraded to Flask 2.0

Soft UI Design - Flask 2.x Free Starter