Add new elements to JSON array

Question

I have a config file that is like

[
  "ECSClusterName=cluster",
  "VPCID=vpc-xxxx",
  "ALBName=ALB"
]

And with jq (or something else bash-native), I'd like to add 2 values - EnvType and KMSID - (doesn't matter where in the config file) so that the end result would look like

[
  "EnvType=dev",
  "KMSID=xxxxx-yyyyyy-ffffff",
  "ECSClusterName=cluster",
  "VPCID=vpc-xxxx",
  "ALBName=ALB"
]

The closest I have been for one value is

cat config.json | jq '.[-1] += ", test=test"'

But that outputs

[
  "ECSClusterName=cluster",
  "VPCID=vpc-xxxx",
  "ALBName=ALB, test=test"
]

Any help greatly appreciated!

oguz ismail · Accepted Answer · 2020-05-26 07:57:10Z

1

Put new key=value pairs into an array, and add that array to the original one.

$ jq '. + ["EnvType=dev", "KMSID=xxxxx-yyyyyy-ffffff"]' config.json
[
  "ECSClusterName=cluster",
  "VPCID=vpc-xxxx",
  "ALBName=ALB",
  "EnvType=dev",
  "KMSID=xxxxx-yyyyyy-ffffff"
]

answered May 26, 2020 at 7:57

oguz ismail

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2 Comments

Mornor Over a year ago

Quick question though - not directly related. Do you know why my arg are not correctly interpreted? jq --arg EnvType ${env} --arg KMSID ${kmsid} '. + ["EnvType=[$EnvType]", "KMSID=[$KMSID]"]' config.json

oguz ismail Over a year ago

@Mornor Unless you put them into string interpolation parens (like "EnvType=[\($EnvType)]"), variable names in strings are not parsed and expanded.

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