# Text indentation detect

`text-indentation-detect` · version 1.0.0 · Text · free, no key needed

Detect whether a text uses tabs or spaces for indentation by counting lines.

**Use when you need to: text indentation detect · detect indentation · check if text uses tabs or spaces.**

## Supported

- text indentation detect
- detect indentation
- check if text uses tabs or spaces

## Not supported

- detect indentation size
- fix indentation
- parse code structure

## Behavior

- Analyzes each line to determine its leading whitespace.
- A line is "tab_indented" if it starts with one or more tabs and no spaces before the first non-whitespace character.
- A line is "space_indented" if it starts with one or more spaces and no tabs before the first non-whitespace character.
- A line is "mixed_indented" if it starts with a combination of tabs and spaces.
- Empty lines and lines with no leading whitespace are ignored.
- predominant is "tabs" if tab_indented_lines > space_indented_lines, "spaces" if space_indented_lines > tab_indented_lines, and "none" otherwise.

## Input

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

## Output

- `tab_indented_lines` (integer, required): min 0
- `space_indented_lines` (integer, required): min 0
- `mixed_indented_lines` (integer, required): min 0
- `predominant` (one of "tabs", "spaces", "none", required)

## Limits

- max text bytes: 1048576
- max output bytes: 1024

## Example

Request input:

```json
{
  "text": "function foo() {\n\treturn 1;\n}"
}
```

Response:

```json
{
  "result": {
    "tab_indented_lines": 1,
    "space_indented_lines": 0,
    "mixed_indented_lines": 0,
    "predominant": "tabs"
  }
}
```

## How to call it

### MCP

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

```json
{
  "id": "text-indentation-detect",
  "version": "1.0.0",
  "input": {
    "text": "function foo() {\n\treturn 1;\n}"
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/text-indentation-detect/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"text":"function foo() {\n\treturn 1;\n}"}'
```

The machine-readable contract is at [/v1/tools/text-indentation-detect/versions/1.0.0](/v1/tools/text-indentation-detect/versions/1.0.0).

### CLI

```sh
node cli.mjs run text-indentation-detect 1.0.0 --input input.json --base-url https://computefirst.net
```

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

## Related tools

- [Text tabs to spaces](/tools/text-tabs-to-spaces): Convert tab characters to spaces.
- [Text conflict render](/tools/text-conflict-render): Render text and conflict parts as merge or diff3 conflict-marker text.
- [Text control characters find](/tools/text-control-characters-find): Find non-whitespace control characters in a text string.
- [Text prefix suffix check](/tools/text-prefix-suffix-check): Exact prefix and/or suffix boolean checks using JS string startsWith/endsWith.
- [Text unicode normalization check](/tools/text-unicode-normalization-check): Check if a text string is in various Unicode normalization forms (NFC, NFD, NFKC, NFKD).
- [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.