# Summarize - Workflow node | Docs - nodulz

Source: https://nodulz.com/docs/nodes/summarize

Language: en

Sum, count, max, etc. across items

## Usage and specifics

Use Summarize to calculate one value from fields in a list. To preserve values in an array without calculating them, use [Aggregate](/docs/nodes/aggregate) instead.

With manual input `{ "tasks": [{ "minutes": 12 }, { "minutes": 8 }, { "minutes": "" }] }`, set `source` to `input.tasks`, `field` to `minutes` and `operation` to `sum`.

Expected output:

```json
{
  "operation": "sum",
  "field": "minutes",
  "result": 20,
  "count": 3
}
```

`result` is the calculation; `count` is the number of source items. Missing, `null` or empty values are excluded from the calculation. With `operation: "count"` on this same field, `result` is therefore `2` while `count` stays `3`.

Numeric operations convert values and ignore those that do not yield a number. If no numeric value is found, they return zero. If an incorrect or missing field should block processing, validate it before this node: a numeric result alone does not prove data quality.

Technical type : `summarize`. Runtime : `nodulz`.

## Credentials and prerequisites

This node defines no dedicated external credential. Remote sources or execution targets may still need their own access credentials.

See the [credentials guide](/docs/credentials) if a remote source or execution target requires access.

## Parameters

Names below are technical keys. Defaults are not a ready-to-run configuration: complete fields required by your operation. Paths containing [] describe list items; some fields depend on the selected mode.

| Parameter | Type | Default | Values / limits |
| --- | --- | --- | --- |
| `source` | `string` | `""` | - |
| `field` | `string` | `""` | - |
| `operation` | `enum` | `"count"` | `sum`, `count`, `min`, `max`, `avg` |

## Initial configuration

Initial catalog configuration example, to adapt before running. Keep secrets in credentials.

```json
{
  "source": "",
  "field": "",
  "operation": "count"
}
```

## Verification

With this example, check a sum of 20, an average of 10 and a count of 2 populated values. Then test an empty list. In later nodes, read `nodes.summarize1.result`, adapting the technical name, rather than confusing this result with `count`.

See also : [Expressions and data](/docs/expressions), [Executions](/docs/executions), [Node catalog](/docs/nodes).

## Explore further

- [Features - nodulz](https://nodulz.com/product/overview)
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- [Pricing - nodulz](https://nodulz.com/pricing)
- [Use cases and workflow automation - nodulz](https://nodulz.com/use-cases)
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- [Documentation - nodulz](https://nodulz.com/docs)