Bash: using sed to replace block of code, treating indents - bash

Question

There's a file, code looks like that:
{
"name": {
"port": 4466,
"host": "localhost",
"appPort": 3555,
"abc": {
"defg": {
"host": "localhost",
"port": 5500,
"userName": "test",
"password": "test"
}
},
"name2": {
"port": 4321,
"host": "localhost",
"appPort": 1234,
"abc": {
"defg": {
"host": "localhost",
"port": 5500,
"userName": "test",
"password": "test"
}
},
etc.
I need to replace the following block of code in a file using sed (or maybe awk):
"name": {
"port": 4466,
"host": "localhost",
"appPort": 3555
Here's what I have, did not succeed:
confSearch='"name": {\n "port": 4466,\n "host": "localhost",\n "appPort": 3555'
confReplacement='"name": {\n "port": 4466,\n "host": "10.20.30.40",\n "appPort": 3555'
sed -i "s|$confSearch|$confReplacement|g" "$configFile"
Then I tried the following (to search from "name" to "3555" and then replace it):
sed -i "/name.*/ {N; s/name.*3555\./$confReplacement/g}" "$configFile"
I don't receive any error, the search text is simply not found. I suppose, that's because of indents. How to treat indents correctly? Or should I prefer something else? Taking into account only bash, not perl.
Would be grateful for the help.

Answer 1

I'd advise against using sed for this task; JSON is not a line-based format, and sed is ill-equipped to handle it unless you are very certain that the file will always be formatted just the right way. There are tools out there that parse JSON properly and work on the object it encodes, so indentation or swapped lines or having several nodes on the same line does not faze them.
In this particular case, I'd suggest jq:
jq 'if .name.port == 4466 and .name.appPort == 3555 and .name.host == "localhost" then .name.host="10.20.30.40" else . end' "$configFile"

Answer 2

sed -i '/"port": 4466,/,/"host": "localhost",/ s/localhost/110.20.30.40/' "$configFile"
assuming there is only 1 host with port 4466

Answer 3

it seems you just want to replace the host, won't you? use something like
sed -i 's/"host":.*$/"host": "10.20.30.40"\n/'.