sql_json_item_cannot_be_cast_to_target_type Sql Json Item Cannot Be Cast To Target Type — SQLSTATE 2203G

The server reports SQLSTATE 2203G (sql_json_item_cannot_be_cast_to_target_type), a condition in the Data Exception class.

• The error is written to the server log and returned to the client carrying SQLSTATE 2203G.
• Any driver (libpq, JDBC, psycopg, npgsql, pgx) surfaces this code in its error object so you can branch on it programmatically.
• PL/pgSQL can trap it by name: EXCEPTION WHEN sql_json_item_cannot_be_cast_to_target_type THEN.

Severity: ERROR  |  PostgreSQL versions: 12, 13, 14, 15, 16, 17

Reproduce with the exact statement and read the full message in the server log (raise log_min_messages / set log_min_error_statement for more context).

2203G belongs to Class 22 — Data Exception. In this class, a value is invalid for its data type or the operation applied to it.

The first two characters (22) identify the error class, so application code can match the whole class via 22000 when the specific code is not needed.

Validate and clean input at the boundary: check ranges, lengths, and formats; cast safely (NULLIF(txt, ''), explicit to_date/to_timestamp); reject bad values before they reach SQL.

Reference: PostgreSQL error codes — Class 22 (Data Exception).