Manipulate JSON with jq

Question

I have following the json file. I am trying to update a couple of properties in this file using jq

{
  \"href\" : \"http://localhost:8080/api/v1/clu         


        

Answer 1

The original question asks how to alter more than one of the "properties". The key to doing so without being repetitive is |=. Here's an illustration:

.items[0].properties |=
  ( .["hfile.block.cache.size"] = "newvalue1"
  | .["hbase.hregion.max.filesize"] = "newvalue2" )

In-place updates

The original question also mentioned updating properties within a file. One possibility that avoids having to create an explicit temporary file is to use sponge (e.g. brew install moreutils), along the lines of:

$ jq .... input.json | sponge input.json 

Answer 2

Manage to do it

jq '.items[0].properties."hfile.block.cache.size"="0.2"' initial.json > 1.json