Looping through json array not working - jq

Question

I have a JSON array conf=

 [ { "fraudThreshold": 4, "fraudTTLSec": 60 }, { "fraudThreshold": 44, "fraudTTLSec": 60 } ]

I want to loop through its items. So I have done the following:

for configy in $(echo "${conf}" | jq -r ".[]"); do 
    echo configy=$configy 
done

The results are:-

configy={
configy="fraudThreshold":
configy=4,
configy="fraudTTLSec":

and so on.

It is splitting the string using spaces and giving the results one by one. Why is bash showing this weird behavior? Is there any solution to this?

Also, it is giving proper values when I do :

configy=$(echo $conf | jq .[-1])
echo configy=$configy

Result:

 configy={ "fraudThreshold": 44, "fraudTTLSec": 60 }

peak · Accepted Answer · 2018-03-16 03:03:56Z

5

In order to loop through the items in the JSON array using bash, you could write:

echo "${conf}" | jq -cr ".[]" |
while read -r configy
do
  echo configy="$configy"
done

This yields:

configy={"fraudThreshold":4,"fraudTTLSec":60}
configy={"fraudThreshold":44,"fraudTTLSec":60}

However there is almost surely a better way to achieve your ultimate goal.

answered Mar 16, 2018 at 3:03

peak

119k21 gold badges185 silver badges218 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

peak · Accepted Answer · 2018-03-17 01:37:06Z

1

echo "${conf}" | jq -car '.[] | "configy=" + tojson'

produces:

configy={"fraudThreshold":4,"fraudTTLSec":60}
configy={"fraudThreshold":44,"fraudTTLSec":60}

edited Mar 17, 2018 at 1:37

peak

119k21 gold badges185 silver badges218 bronze badges

answered Mar 16, 2018 at 3:17

user935712063

1,4011 gold badge11 silver badges22 bronze badges

Comments

Armali · Accepted Answer · 2018-03-16 08:20:48Z

0

for configy in $(echo "${conf}" | jq -r ".[]"); do 
It is splitting the string using spaces and giving the results one by one. Why is bash showing this weird behavior?

This behavior is not weird at all. See the Bash Reference Manual: Word Splitting:

The shell scans the results of parameter expansion, command substitution, and arithmetic expansion that did not occur within double quotes for word splitting.

Is there any solution to this?

Mâtt Frëëman and peak presented working solutions; you can slightly optimize them by replacing echo "${conf}" | with <<<"$conf".

answered Mar 16, 2018 at 8:20

Armali

19.6k15 gold badges64 silver badges185 bronze badges

Collectives™ on Stack Overflow

Looping through json array not working - jq

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related