JSON_UNQUOTE

Unquote a JSON value. This function removes the quotes from a JSON string and unescapes special characters.

Syntax

JSON_UNQUOTE(val)

Description

Unquotes a JSON value, returning a string, or NULL if the argument is null.

An error will occur if the given value begins and ends with double quotes and is an invalid JSON string literal.

If the given value is not a JSON string, value is passed through unmodified.

Certain character sequences have special meanings within a string. Usually, a backslash is ignored, but the escape sequences in the table below are recognised by MariaDB, unless the SQL Mode is set to NO_BACKSLASH_ESCAPES .

Escape sequence	Character
"	Double quote (")
\b	Backslash
\f	Formfeed
\n	Newline (linefeed)
\r	Carriage return
\t	Tab
\	Backslash ()
\uXXXX	UTF-8 bytes for Unicode value XXXX

Examples

SELECT JSON_UNQUOTE('"Monty"');
+-------------------------+
| JSON_UNQUOTE('"Monty"') |
+-------------------------+
| Monty                   |
+-------------------------+

With the default SQL Mode:

SELECT JSON_UNQUOTE('Si\bng\ting');
+-----------------------------+
| JSON_UNQUOTE('Si\bng\ting') |
+-----------------------------+
| Sng	ing                   |
+-----------------------------+

Setting NO_BACKSLASH_ESCAPES:

SET @@sql_mode = 'NO_BACKSLASH_ESCAPES';

SELECT JSON_UNQUOTE('Si\bng\ting');
+-----------------------------+
| JSON_UNQUOTE('Si\bng\ting') |
+-----------------------------+
| Si\bng\ting                 |
+-----------------------------+

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