How do I update a single value in a json document using jq?

Question

Appologies if I\'ve overlooked something very obvious; I\'ve just found jq and am trying to use it to update one JSON value without affecting the surrounding da

Answer 1

Update a value (sets .foo.bar to "new value"):

jq '.foo.bar = "new value"' file.json

Update a value using a variable (sets .foo.bar to "hello"):

variable="hello"; jq --arg variable "$variable" '.foo.bar = $variable' file.json