# Text unicode normalization check

`text-unicode-normalization-check` · version 1.0.0 · Text · free, no key needed

Check if a text string is in various Unicode normalization forms (NFC, NFD, NFKC, NFKD).

**Use when you need to: text unicode normalization check · check unicode normalization · is text nfc.**

## Supported

- text unicode normalization check
- check unicode normalization
- is text nfc

## Not supported

- normalize text
- fix encoding
- detect encoding

## Behavior

- Checks the provided string against the four standard Unicode normalization forms.
- Returns true for a form if the string is identical to its normalized version in that form.
- Assumes the input is valid UTF-16 (JavaScript strings).

## Input

- `text` (string, required): max length 1048576

## Output

- `is_nfc` (boolean, required)
- `is_nfd` (boolean, required)
- `is_nfkc` (boolean, required)
- `is_nfkd` (boolean, required)

## Limits

- max text bytes: 1048576

## Example

Request input:

```json
{
  "text": "é"
}
```

Response:

```json
{
  "result": {
    "is_nfc": true,
    "is_nfd": false,
    "is_nfkc": true,
    "is_nfkd": false
  }
}
```

## How to call it

### MCP

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

```json
{
  "id": "text-unicode-normalization-check",
  "version": "1.0.0",
  "input": {
    "text": "é"
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/text-unicode-normalization-check/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"text":"é"}'
```

The machine-readable contract is at [/v1/tools/text-unicode-normalization-check/versions/1.0.0](/v1/tools/text-unicode-normalization-check/versions/1.0.0).

### CLI

```sh
node cli.mjs run text-unicode-normalization-check 1.0.0 --input input.json --base-url https://computefirst.net
```

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

## Related tools

- [Text NFC](/tools/text-nfc): Normalize Unicode text to NFC (canonical composition).
- [Text indentation detect](/tools/text-indentation-detect): Detect whether a text uses tabs or spaces for indentation by counting lines.
- [Text NFD](/tools/text-nfd): Normalize Unicode text to NFD (canonical decomposition).
- [Text prefix suffix check](/tools/text-prefix-suffix-check): Exact prefix and/or suffix boolean checks using JS string startsWith/endsWith.
- [Text slice codepoints](/tools/text-slice-codepoints): Slice a string by Unicode code-point indexes, not UTF-16 code units.
- [Text apply unified patch](/tools/text-apply-unified-patch): Apply a one-file unified patch to text at original line addresses with exact hunk matches.