# JSON array concat

`json-array-concat` · version 1.0.0 · JSON & JSONL · free, no key needed

Concatenate multiple JSON arrays of objects into one.

**Use when you need to: json array concat · concatenate json arrays · combine json arrays.**

## Supported

- json array concat
- concatenate json arrays
- combine json arrays

## Not supported

- deep merging

## Behavior

- Appends all objects from the provided arrays in sequence.
- Returns a new array containing copies of all objects.

## Input

- `arrays` (array of array of object, required): max items 32; each max items 10000

## Output

- `result` (array of object, required)
- `count` (integer, required)

## Limits

- max arrays: 32
- max output items: 10000

## Example

Request input:

```json
{
  "arrays": [
    [
      {
        "a": 1
      }
    ],
    [
      {
        "b": 2
      }
    ],
    [
      {
        "c": 3
      }
    ]
  ]
}
```

Response:

```json
{
  "result": {
    "result": [
      {
        "a": 1
      },
      {
        "b": 2
      },
      {
        "c": 3
      }
    ],
    "count": 3
  }
}
```

## How to call it

### MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "json-array-concat",
  "version": "1.0.0",
  "input": {
    "arrays": [
      [
        {
          "a": 1
        }
      ],
      [
        {
          "b": 2
        }
      ],
      [
        {
          "c": 3
        }
      ]
    ]
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/json-array-concat/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"arrays":[[{"a":1}],[{"b":2}],[{"c":3}]]}'
```

The machine-readable contract is at [/v1/tools/json-array-concat/versions/1.0.0](/v1/tools/json-array-concat/versions/1.0.0).

### CLI

```sh
node cli.mjs run json-array-concat 1.0.0 --input input.json --base-url https://computefirst.net
```

Get the client at [/clients/cli/](/clients/cli/).

## Related tools

- [JSON array anti join](/tools/json-array-anti-join): Anti join two JSON arrays of objects on exact keys.
- [JSON array inner join](/tools/json-array-inner-join): Inner join two JSON arrays of objects on exact keys.
- [JSON array left join](/tools/json-array-left-join): Left join two JSON arrays of objects on exact keys.
- [Array to JSONL](/tools/array-to-jsonl): Serialize an array of JSON-safe values as JSON Lines text.
- [JSON array count](/tools/json-array-count): Count structural occurrences in a JSON array in first-seen order.
- [JSON array distinct by](/tools/json-array-distinct-by): Deduplicate a JSON array of objects based on specific keys.