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The Import Diagram feature is designed to work exclusively with JSON files that have been exported from ChartDB using the Export Diagram feature. This feature is for importing saved ChartDB diagrams, not for importing database schemas directly.
ChartDB lets you import a database diagram from a JSON file that was previously exported from ChartDB. This feature restores a saved diagram, allowing you to continue your work and make further modifications.
1

Access Import Diagram

Navigate to the Share menu in the top navigation bar. From the dropdown, select Import Diagram.
2

Upload JSON File

Click in the designated upload area or drag and drop your previously exported .json file into the dialog.
3

Import Diagram

Once the JSON file is uploaded, click the Import button. ChartDB will then load the diagram from the JSON file, displaying your database schema and relationships.