Loading...
Grep your JSON data with gron

Grep your JSON data with gron

Used:   gron v0.6.0 

Do you ever need to find specific information in a large JSON data output? Most of us end up using grep in the Linux console. There is another way to read structured JSON data. The solution is gron by Tom Hudson, and its goal is to make JSON greppable.

Installation

This section describes the installation for Mac OS with brew.

Set permission for your installation

sudo chown -R $(whoami) /usr/local/sbin

Install it.

brew install gron

Usage

Most of the time in operations I check docker containers regarding their network settings.

An example:

docker inspect nginx | gron | fgrep "NetworkSettings"

The output:

json[0].NetworkSettings = {};
json[0].NetworkSettings.Bridge = "";
json[0].NetworkSettings.EndpointID = "403b4f8273f3d9e3f0cf15d66a3829bfdb64b2d6fda4f83417cf5831998c1292";
json[0].NetworkSettings.Gateway = "172.17.0.1";
json[0].NetworkSettings.GlobalIPv6Address = "";
json[0].NetworkSettings.GlobalIPv6PrefixLen = 0;
json[0].NetworkSettings.HairpinMode = false;
json[0].NetworkSettings.IPAddress = "172.17.0.2";
json[0].NetworkSettings.IPPrefixLen = 16;
json[0].NetworkSettings.IPv6Gateway = "";
json[0].NetworkSettings.LinkLocalIPv6Address = "";
json[0].NetworkSettings.LinkLocalIPv6PrefixLen = 0;
json[0].NetworkSettings.MacAddress = "02:42:ac:11:00:02";
json[0].NetworkSettings.Networks = {};
json[0].NetworkSettings.Networks.bridge = {};
json[0].NetworkSettings.Networks.bridge.Aliases = null;
json[0].NetworkSettings.Networks.bridge.DriverOpts = null;
json[0].NetworkSettings.Networks.bridge.EndpointID = "403b4f8273f3d9e3f0cf15d66a3829bfdb64b2d6fda4f83417cf5831998c1292";
json[0].NetworkSettings.Networks.bridge.Gateway = "172.17.0.1";
json[0].NetworkSettings.Networks.bridge.GlobalIPv6Address = "";
json[0].NetworkSettings.Networks.bridge.GlobalIPv6PrefixLen = 0;
json[0].NetworkSettings.Networks.bridge.IPAMConfig = null;
json[0].NetworkSettings.Networks.bridge.IPAddress = "172.17.0.2";
json[0].NetworkSettings.Networks.bridge.IPPrefixLen = 16;
json[0].NetworkSettings.Networks.bridge.IPv6Gateway = "";
json[0].NetworkSettings.Networks.bridge.Links = null;
json[0].NetworkSettings.Networks.bridge.MacAddress = "02:42:ac:11:00:02";
json[0].NetworkSettings.Networks.bridge.NetworkID = "00a571161e8b1042db9eef3a461797f3627cb7ce6e5d573ae546d7123bcdf946";
json[0].NetworkSettings.Ports = {};
json[0].NetworkSettings.Ports["80/tcp"] = [];
json[0].NetworkSettings.Ports["80/tcp"][0] = {};
json[0].NetworkSettings.Ports["80/tcp"][0].HostIp = "0.0.0.0";
json[0].NetworkSettings.Ports["80/tcp"][0].HostPort = "80";
json[0].NetworkSettings.SandboxID = "39766f8315f95bb94fe6b801f72aff1fd436f88a5f2417170eeceaa372cb7571";
json[0].NetworkSettings.SandboxKey = "/var/run/docker/netns/39766f8315f9";
json[0].NetworkSettings.SecondaryIPAddresses = null;
json[0].NetworkSettings.SecondaryIPv6Addresses = null;

JSON Please!

You like that is greppable, but would prefer the output in JSON? That’s possible :smile: Use the backwards option with --ungron.

docker inspect nginx | gron | fgrep "NetworkSettings" | gron --ungron

The JSON data:

[
  {
    "NetworkSettings": {
      "Bridge": "",
      "EndpointID": "403b4f8273f3d9e3f0cf15d66a3829bfdb64b2d6fda4f83417cf5831998c1292",
      "Gateway": "172.17.0.1",
      "GlobalIPv6Address": "",
      "GlobalIPv6PrefixLen": 0,
      "HairpinMode": false,
      "IPAddress": "172.17.0.2",
      "IPPrefixLen": 16,
      "IPv6Gateway": "",
      "LinkLocalIPv6Address": "",
      "LinkLocalIPv6PrefixLen": 0,
      "MacAddress": "02:42:ac:11:00:02",
      "Networks": {
        "bridge": {
          "Aliases": null,
          "DriverOpts": null,
          "EndpointID": "403b4f8273f3d9e3f0cf15d66a3829bfdb64b2d6fda4f83417cf5831998c1292",
          "Gateway": "172.17.0.1",
          "GlobalIPv6Address": "",
          "GlobalIPv6PrefixLen": 0,
          "IPAMConfig": null,
          "IPAddress": "172.17.0.2",
          "IPPrefixLen": 16,
          "IPv6Gateway": "",
          "Links": null,
          "MacAddress": "02:42:ac:11:00:02",
          "NetworkID": "00a571161e8b1042db9eef3a461797f3627cb7ce6e5d573ae546d7123bcdf946"
        }
      },
      "Ports": {
        "80/tcp": [
          {
            "HostIp": "0.0.0.0",
            "HostPort": "80"
          }
        ]
      },
      "SandboxID": "39766f8315f95bb94fe6b801f72aff1fd436f88a5f2417170eeceaa372cb7571",
      "SandboxKey": "/var/run/docker/netns/39766f8315f9",
      "SecondaryIPAddresses": null,
      "SecondaryIPv6Addresses": null
    }
  }
]