Mysql set default value to a json type column

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From version 8.0.13 onwards, the documentation says (emphasis is mine):

The BLOB, TEXT, GEOMETRY, and JSON data types can be assigned a default value only if the value is written as an expression, even if the expression value is a literal.

You can make your default an expression by surrounding the literal value with parentheses:

ALTER TABLE templates CHANGE COLUMN values JSON NOT NULL DEFAULT ('{}') ;

Or:

ALTER TABLE templates CHANGE COLUMN values JSON NOT NULL DEFAULT (JSON_OBJECT()) ;

Prior to version 8.0.13 of MySQL, it was not possible to set a default value on a JSON column, as the 8.0 documentation points out a few paragraphs later :

The BLOB, TEXT, GEOMETRY, and JSON data types cannot be assigned a default value.

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