Remove specific key from a JSON object using jq.
Pretty-print JSON sample.
$ jq . topics.json
{
"topics": [
{
"topic": "cerberus"
},
{
"topic": "kraken"
},
{
"topic": "hydra"
}
],
"version": 1
}
Remove version.
$ jq 'del(.version)' /tmp/topics.json
{
"topics": [
{
"topic": "cerberus"
},
{
"topic": "kraken"
},
{
"topic": "hydra"
}
]
}
Remove specific topic.
$ jq 'del(.topics[] | select(.topic=="hydra"))' /tmp/topics.json
{
"topics": [
{
"topic": "cerberus"
},
{
"topic": "kraken"
}
],
"version": 1
}
Pretty-print JSON sample.
$ jq . topic.proposed.json
{
"version": 1,
"partitions": [
{
"topic": "cerberus",
"partition": 0,
"replicas": [
1,
4,
2
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 1,
"replicas": [
2,
1,
3
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 2,
"replicas": [
3,
2,
4
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 3,
"replicas": [
4,
3,
1
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 4,
"replicas": [
1,
2,
3
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 5,
"replicas": [
2,
3,
4
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 6,
"replicas": [
3,
4,
1
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 7,
"replicas": [
4,
1,
2
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 8,
"replicas": [
1,
3,
4
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 9,
"replicas": [
2,
4,
1
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 10,
"replicas": [
3,
1,
2
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 11,
"replicas": [
4,
2,
3
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 12,
"replicas": [
1,
4,
2
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 13,
"replicas": [
2,
1,
3
],
"log_dirs": [
"any",
"any",
"any"
]
},
{
"topic": "cerberus",
"partition": 14,
"replicas": [
3,
2,
4
],
"log_dirs": [
"any",
"any",
"any"
]
}
]
}
Remove log_dirs from each partition.
$ jq 'del(.partitions[] | .log_dirs)' topic.proposed.json
{
"version": 1,
"partitions": [
{
"topic": "cerberus",
"partition": 0,
"replicas": [
1,
4,
2
]
},
{
"topic": "cerberus",
"partition": 1,
"replicas": [
2,
1,
3
]
},
{
"topic": "cerberus",
"partition": 2,
"replicas": [
3,
2,
4
]
},
{
"topic": "cerberus",
"partition": 3,
"replicas": [
4,
3,
1
]
},
{
"topic": "cerberus",
"partition": 4,
"replicas": [
1,
2,
3
]
},
{
"topic": "cerberus",
"partition": 5,
"replicas": [
2,
3,
4
]
},
{
"topic": "cerberus",
"partition": 6,
"replicas": [
3,
4,
1
]
},
{
"topic": "cerberus",
"partition": 7,
"replicas": [
4,
1,
2
]
},
{
"topic": "cerberus",
"partition": 8,
"replicas": [
1,
3,
4
]
},
{
"topic": "cerberus",
"partition": 9,
"replicas": [
2,
4,
1
]
},
{
"topic": "cerberus",
"partition": 10,
"replicas": [
3,
1,
2
]
},
{
"topic": "cerberus",
"partition": 11,
"replicas": [
4,
2,
3
]
},
{
"topic": "cerberus",
"partition": 12,
"replicas": [
1,
4,
2
]
},
{
"topic": "cerberus",
"partition": 13,
"replicas": [
2,
1,
3
]
},
{
"topic": "cerberus",
"partition": 14,
"replicas": [
3,
2,
4
]
}
]
}
Could not be simpler!