Text count

text-count · version 1.0.0 · Text · free, no key needed

Count Unicode code points, UTF-16 code units, UTF-8 bytes, and lines.

Use when you need to: text count · count code points · utf8 byte length.

Supported

• text count
• count code points
• utf8 byte length
• count lines

Not supported

• grapheme clusters
• locale
• word count
• column width

Behavior

• code_points: number of Unicode code points via for-of over the string (unpaired surrogates count as one each).
• utf16_code_units: text.length.
• utf8_bytes: Buffer.byteLength(text, "utf8").
• Split on CR LF, LF, or CR. Do not treat other Unicode separators as line breaks.
• A trailing terminator does not create an extra empty line.
• Empty document -> zero lines, trailing_terminator false.
• A document that is only a terminator -> one empty line, trailing_terminator true.
• A document with no terminator -> last line kept, trailing_terminator false.
• Preserve empty lines in the middle.
• No locale, no NFC/NFD, no grapheme segmentation.

Input

• text (string, required): max length 256000

Output

• code_points (integer, required)
• utf16_code_units (integer, required)
• utf8_bytes (integer, required)
• lines (integer, required)
• trailing_terminator (boolean, required)

Limits

• max input bytes: 256000
• max lines: 10000

Example

Request input:

{
  "text": "שלום\n"
}

Response:

{
  "result": {
    "code_points": 5,
    "utf16_code_units": 5,
    "utf8_bytes": 9,
    "lines": 1,
    "trailing_terminator": true
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "text-count",
  "version": "1.0.0",
  "input": {
    "text": "שלום\n"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/text-count/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"text":"שלום\n"}'

The machine-readable contract is at /v1/tools/text-count/versions/1.0.0.

CLI

node cli.mjs run text-count 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Text lines count: Count exact line multiplicities in first-seen order.
• Text slice codepoints: Slice a string by Unicode code-point indexes, not UTF-16 code units.
• Text diff stats: Summarize a line-record diff as keep, insert, delete, and hunk counts.
• Text line diff: Diff two texts as line records, preserving each line terminator.
• Text lines chunk: Split parsed lines into consecutive chunks of size lines each.
• Text lines difference: Set difference a minus b using exact line equality.