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Group JSON Array

Group objects by a scalar top-level field, retaining each group and its count.

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JSON group by field online

Group JSON array records for a count report. Grouping uses a scalar top-level field; inspect missing values before relying on totals.

How to use it

Enter the source input or select Try example. Review Group field. Select Run tool and inspect the result before copying or downloading.

Options and example settings

Option	Choices / value	Example default
Group field	Enter a value	team

Worked examples

Group JSON array records for a count report.

Worked example — Group JSON Array

Settings: Group field: team

Input:

[{"name":"Anna","team":"A"},{"name":"Ben","team":"B"},{"name":"Clara","team":"A"}]

Output:

[
  {
    "missing": false,
    "key": "A",
    "count": 2,
    "items": [
      {
        "name": "Anna",
        "team": "A"
      },
      {
        "name": "Clara",
        "team": "A"
      }
    ]
  },
  {
    "missing": false,
    "key": "B",
    "count": 1,
    "items": [
      {
        "name": "Ben",
        "team": "B"
      }
    ]
  }
]

The example returns 2 top-level items in an array. Each item is a record; the first record contains “missing”, “key”, “count”, “items”.

Limitations and common mistakes

Grouping uses a scalar top-level field; inspect missing values before relying on totals.

Frequently asked questions

How can I group objects by a scalar top-level field in JSON online?

Enter the source input or select Try example. Review Group field. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.