MySQL raises ER_INVALID_JSON_DATA (code 3069, SQLSTATE HY000) when a JSON function receives malformed or non-standard JSON input.
ER_INVALID_JSON_DATA appears when a MySQL JSON function gets malformed JSON. Validate the JSON string or cast the column to valid JSON, then rerun the query to resolve the error.
ER_INVALID_JSON_DATA
MySQL returns ER_INVALID_JSON_DATA (error code 3069, SQLSTATE HY000) when a JSON function such as JSON_EXTRACT, JSON_ARRAY, or JSON_MERGE receives input that is not valid JSON.
The server stops executing the statement, shows the exact function name and a short description of the JSON problem, and rolls back the current statement if needed.
The error arises during INSERT, UPDATE, or SELECT operations that call JSON functions directly or indirectly through generated columns, triggers, or default expressions.
It can also appear when importing data via LOAD DATA or when casting text to the JSON data type.
Invalid JSON can hide data corruption, block application features that rely on JSON columns, and cause lost writes if transactions are rolled back. Fixing it ensures data integrity and smooth application logic.
Unescaped double quotes, missing commas, trailing commas, and single quotes are frequent syntax issues that break JSON validity.
Character-set mismatches, control characters, or truncated payloads from network transfers also generate the error.
Locate the faulty value using the error message, validate it with JSON_VALID or an external linter, correct the syntax, and retry the statement.
If the value comes from a column, update the row with JSON_SET or cast the string with CAST(col AS JSON) after fixing the text.
Inserts that build JSON on the fly often miss quotes. Use JSON_OBJECT to construct safe JSON instead of manual concatenation.
APIs sometimes send single-quoted JSON. Replace single quotes with double quotes before writing to MySQL or set your driver to produce proper JSON.
Validate JSON in the application layer before sending it to MySQL. Use STRICT_TRANS_TABLES SQL mode so bad JSON never lands in the table.
Store JSON in dedicated JSON columns and avoid text manipulation. Galaxy's AI copilot can auto-generate JSON_OBJECT based inserts, reducing manual mistakes.
ER_INVALID_JSON_CHARSET (3146) appears when the JSON string uses an unsupported character set. Convert the string to utf8mb4.
ER_INVALID_JSON_TEXT (3140) is thrown for generic JSON parsing errors. The fixes mirror those for ER_INVALID_JSON_DATA: sanitize and validate the input.
Missing commas, extra trailing commas, or unescaped quotes break JSON syntax.
JSON containing bytes outside utf8mb4 or control characters triggers the error.
Single-quoted JSON or back-tick-quoted keys reject under strict SQL modes.
Network timeouts or incomplete file imports leave JSON incomplete, raising the error.
Generic JSON parse failure. Fix by validating and correcting the JSON syntax.
JSON string uses a non-utf8mb4 character set. Convert the data or column charset.
Occurs when JSON_EXTRACT looks for a path that references a non-existent column.
No. MySQL halts the statement, so ignoring it leaves data unchanged and operations incomplete.
Use JSON_VALID in a CHECK constraint or run it in the application layer prior to executing INSERT.
No. MySQL enforces strict JSON syntax. It will not auto-insert missing quotes or commas.
Galaxy's AI copilot writes JSON_OBJECT based statements and its schema-aware linting flags invalid JSON before queries reach production.
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