Parse a JSON string that may be missing closing braces.
Parse a JSON string from a Markdown string.
Parse and check a JSON string from a Markdown string.
Checks that it contains the expected keys.
Exception that output parsers should raise to signify a parsing error.
This exists to differentiate parsing errors from other code or execution errors that also may arise inside the output parser.
OutputParserException will be available to catch and handle in ways to fix the
parsing error, while other errors will be raised.
