set a value of jsonb postgres code example

Example 1: postgres jsonb array push new element

UPDATE jsontesting
SET jsondata = jsondata || '["newString"]'::jsonb
WHERE id = 7;

Example 2: update json in postgres

[{“type”: “phone”, “value”: “+1–202–555–0105”}, {“type”: “email”, “value”: “jimi.hendrix@gmail.com”}]

[{“type”: “email”, “value”: “janis.joplin@gmail.com”}]