Integrate json values into another file - json

Question

I'm trying to update an existing json file from values in another json file using jq in a bash shell.
I've got a settings json file
{
"Logging": {
"MinimumLevel": {
"Default": "Information",
"Override": "Warning"
},
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "./logs/log-.txt",
"rollingInterval": "Day"
}
}
]
},
"Settings": {
"DataServerUrl": "https://address.to.server.com",
"ServerKey": "1f969476798adfe95114dd28ed3a3ff"
"ServerTimeZone": "Mountain Standard Time",
"MaxOccupantCount": 6
}
}
In an integration step, I'm attempting to incorporate values for specific environments (think dev/staging/prod) from an external json file with limited setting values. An example of such a file is
{
"DataServerUrl": "https://dev.server.addr.com",
"ServerKey": "2a4d99233efea456b95114aa23ed342ae"
}
I can get to the data using jq. I can update the data using jq if I hard-code the updates. I'm looking for something general to take in any environment settings values and update them in the base settings file. My searches suggest I can do this in a single step without knowing the specific values. A command similar to
jq -r 'to_entries[]' settings.dev.json |
while IFS= read -r key value; do
jq -r '.[$key] |= [$value]' settings.json
done
What happens is I get error messages stating jq: error: $key is not defined at <top-level> (as well as the same message for $value). The messages appear several times in pairs. settings.json is not changed. Now, this makes partial sense because the output from just jq -r 'to_entries[]' settings.dev.json looks like (empty space in this output is included as produced by the command).
"key": "DataServerUrl",
"value": "https://dev.server.addr.com"
"key": "ServerKey",
"value": "2a4d99233efea456b95114aa23ed342ae"
How do I go about iterating over the values in the environment settings file such that I can use those values to update the base settings file for further processing (i.e., publishing to the target environment)?

Answer 1

The simplest way is to provide both files and address the second one using input. That way, all you need is the assignment:
jq '.Settings = input' settings.json insert.json
{
"Logging": {
"MinimumLevel": {
"Default": "Information",
"Override": "Warning"
},
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "./logs/log-.txt",
"rollingInterval": "Day"
}
}
]
},
"Settings": {
"DataServerUrl": "https://dev.server.addr.com",
"ServerKey": "2a4d99233efea456b95114aa23ed342ae"
}
}
Demo

Answer 2

You could do something like
jq -s '.[1] as $insert | .[0].Settings |= $insert | .[0]' settings.json insert.json
Where we :
slurp both files
Save insert.json to a variable called $insert
Append (|=) $insert to .[0].Settings
Show only the first file .[0]
So the output will become:
{
"Logging": {
"MinimumLevel": {
"Default": "Information",
"Override": "Warning"
},
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "./logs/log-.txt",
"rollingInterval": "Day"
}
}
]
},
"Settings": {
"DataServerUrl": "https://dev.server.addr.com",
"ServerKey": "2a4d99233efea456b95114aa23ed342ae"
}
}