Assigning an Array Parsed With jq to Bash Script Array

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We can solve this problem by two ways. They are:

Input string:

// test.json
{
    "keys": ["key1","key2","key3"]
}

Approach 1:

1) Use jq -r (output raw strings, not JSON texts) .

KEYS=$(jq -r '.keys' test.json)
echo $KEYS
# Output: [ "key1", "key2", "key3" ]

2) Use @sh (Converts input string to a series of space-separated strings). It removes square brackets[], comma(,) from the string.

KEYS=$(<test.json jq -r '.keys | @sh')
echo $KEYS
# Output: 'key1' 'key2' 'key3'

3) Using tr to remove single quotes from the string output. To delete specific characters use the -d option in tr.

KEYS=$((<test.json jq -r '.keys | @sh')| tr -d \') 
echo $KEYS
# Output: key1 key2 key3

4) We can convert the comma-separated string to the array by placing our string output in a round bracket().
It also called compound Assignment, where we declare the array with a bunch of values.

ARRAYNAME=(value1 value2  .... valueN)

#!/bin/bash
KEYS=($((<test.json jq -r '.keys | @sh') | tr -d \'\"))

echo "Array size: " ${#KEYS[@]}
echo "Array elements: "${KEYS[@]}

# Output: 
# Array size:  3
# Array elements: key1 key2 key3

Approach 2:

1) Use jq -r to get the string output, then use tr to delete characters like square brackets, double quotes and comma.

#!/bin/bash
KEYS=$(jq -r '.keys' test.json  | tr -d '[],"')
echo $KEYS

# Output: key1 key2 key3

2) Then we can convert the comma-separated string to the array by placing our string output in a round bracket().

#!/bin/bash
KEYS=($(jq -r '.keys' test.json  | tr -d '[]," '))

echo "Array size: " ${#KEYS[@]}
echo "Array elements: "${KEYS[@]}

# Output:
# Array size:  3
# Array elements: key1 key2 key3

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