Error DeserializeJSON() MySQL json_object - mysql

Question

I am getting back a JSON string from a MySQL 5.7 query in ColdFusion 9.0.1. Here is my query:
SELECT (
SELECT GROUP_CONCAT(
JSON_OBJECT(
'nrtype', nrt.nrtype,
'number', nr.number
)
)
) AS nrJSON
FROM ...
The returned data looks like this:
{"nrtype": "Phone 1", "number": "12345678"},{"nrtype": "E-Mail 1", "number": "some#email.com"}
But as soon as I try to use DeserializeJSON() on it I am getting the following error:
JSON parsing failure at character 44:',' in {"nrtype": "Phone 1", "number": "12345678"},{"nrtype": "E-Mail 1", "number": "some#email.com"}
I am a little confused. What I want to get is a structure created by the DeserializeJSON() function.
What can I do?

Answer 1

That is not valid JSON as the parser is describing. If you wrap that JSON within square brackets '[' and ']' it would be valid (or at least parsable). They will make it an array of structures. Not sure how to make MySQL return the data within those brackets?
I guess you could add the brackets using ColdFusion but I would prefer to have the source do it correctly.
jsonhack = '[' & queryname.nrJSON & ']';
datarecord = DeserializeJSON(jsonhack);
writeDump(datarecord);
I created an example with your data that you can see here - trycf.com gist
From the comments
The solution indeed was [to add the following to the SQL statement]:
CONTACT('[',
GROUP_CONCAT(
JSON_OBJECT(...)
),
']')

Answer 2

If you have columns with some already containing JSON format String, try this : https://stackoverflow.com/a/45278722/2282880
Portion of code with JSON_MERGE() :
...
CONCAT(
'{"elements": [',
GROUP_CONCAT(
JSON_MERGE(
JSON_OBJECT(
'type', T2.`type`,
'data', T2.`data`
),
CONCAT('{"info": ', T2.`info`, '}')
)
),
']}'
) AS `elements`,
...