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JSON formatter for Python

From this StackOverflow answer.

prettyjson() is a Python function that allows to pretty-print JSON content with line splits and indentations.

Usage:

txt = prettyjson(obj, indent=2, maxlinelength=80)

  • obj - any object containing lists, dicts, tuples and basic types.
  • indent - number of characters to indent the next level with.
  • maxlinelength - maximum number of characters per line.

Example of rendered JSON:

{
  "grid": {"port": "COM5"},
  "policy": {
    "movingaverage": 5,
    "hysteresis": 5,
    "fan1": {
      "name": "fan1",
      "signal": "cpu",
      "mode": "auto",
      "speed": 100,
      "curve": [[0, 75], [65, 75], [75, 100]]
    },
    "fan2": {
      "name": "fan2",
      "signal": "gpu",
      "mode": "auto",
      "speed": 100,
      "curve": [[0, 75], [65, 75], [75, 100]]
    }
  },
  "signals": {
    "cpu": {
      "fn": "max",
      "sensors": [
        "/intelcpu/0, CPU Core #1", "/intelcpu/0, CPU Core #2",
        "/intelcpu/0, CPU Core #3", "/intelcpu/0, CPU Core #4"
      ]
    },
    "gpu": {"fn": "max", "sensors": ["/nvidiagpu/0"]},
    "sys": {"fn": "max", "sensors": ["/intelcpu/0", "/nvidiagpu/0"]}
  },
  "app": {
    "startwithwindows": true, "startminimized": false, "closetotray": true
  }
}

Various data setups are conveniently rendered:

{
  "empty_1d": [],
  "empty_2d": [[], []],
  "empty_dict_1d": {},
  "empty_dict_2d": {"a": {}, "b": {}},
  "halfempty_2d": [[223, "hello"], []],
  "string_value": "this is a string",
  "int_value": 5,
  "float_value": 223450.0,
  "float_array_1d": [
    0.5543, 2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0,
    84492033, -1229340.2234, 12234.5532, 0.5543, 2.33576, 0.32333455, 1.2345663,
    -123.445677, 522340000000000.0, 84492033, -1229340.2234, 12234.5532, 0.5543,
    2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0, 84492033,
    -1229340.2234, 12234.5532
  ],
  "floats_2d_1": [
    [0.5543, 2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0],
    [0.5543, 2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0],
    [0.5543, 2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0]
  ],
  "floats_2d_2": [
    [
      0.5543, 2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0,
      84492033, -1229340.2234, 12234.5532, 0.5543, 2.33576, 0.32333455, 1.2345663,
      -123.445677, 522340000000000.0, 84492033, -1229340.2234, 12234.5532, 0.5543,
      2.33576, 0.32333455, 1.2345663, -123.445677, 522340000000000.0, 84492033,
      -1229340.2234, 12234.5532
    ]
  ]
}
Enjoy!

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Pretty-print JSON in Python.

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