Update json using sed - Docker container - sed

Question

Working with docker and looking to update JSON with sed.
Here is the JSON :
var configLocalnet = {
version: '20180720',
websocket: {
protocol: 'http',
host: 'localhost',
port: '8082',
},
publicapi: {
protocol: 'http',
host: 'localhost',
port: '8082',
},
}
var configMainnet = {
version: '20180720',
websocket: {
protocol: 'https',
host: 'to_update',
port: '443',
},
publicapi: {
protocol: 'https',
host: 'to_update',
port: '443',
},
}
module.exports = process.env.REACT_APP_ENVIRONMENT === "mainnet" ? configMainnet : configLocalnet;
Need to the values in config var configMainnet to change to:
Both host details inside configMainnet should be changed to test.test.io
var configMainnet = {
version: '20180720',
websocket: {
protocol: 'https',
host: 'test.test.io',
port: '443',
},
publicapi: {
protocol: 'https',
host: 'test.test.io',
port: '443',
},
}

Answer 1

You may use:
sed -E "s/(host:.).+$/\1'test.test.io',/g"
Example:
echo "var configMainnet = {
version: '20180720',
websocket: {
protocol: 'https',
host: 'to_update',
port: '443',
},
publicapi: {
protocol: 'https',
host: 'to_update',
port: '443',
},
}" | sed -E "s/(host:.).+$/\1'test.test.io',/g"
var configMainnet = {
version: '20180720',
websocket: {
protocol: 'https',
host: 'test.test.io',
port: '443',
},
publicapi: {
protocol: 'https',
host: 'test.test.io',
port: '443',
},
}