Line Prefix Suffix API

POST https://api.findutils.com/api/tools/line-prefix-suffix/execute

Add a prefix, a suffix, or line numbers to every line of a text. Numbering starts at any value, steps by any amount, pads with zeros on request, and can skip blank lines.

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Request body

application/json

text

string required

Newline-separated input.
prefix

string optional

Text to put at the start of each line. Default: none. Default "".
suffix

string optional

Text to put at the end of each line. Default: none. Default "".
number_lines

boolean optional

Put a line number before each line. Default: false. Default false.
start_at

integer optional

First line number. Default: 1. Default 1.
step

integer optional

Increment between line numbers. Default: 1. Default 1.
number_format

string optional

Template for the number with {n} as the placeholder. Default: "{n}. " Default "{n}. ".
pad_numbers

boolean optional

Pad numbers with leading zeros to the width of the last number. Default: false. Default false.
skip_blank

boolean optional

Leave lines that hold only whitespace unchanged and unnumbered. Default: false. Default false.

Example arguments

Verified

{
  "text": "apples\npears",
  "number_lines": true
}

curl -X POST https://api.findutils.com/api/tools/line-prefix-suffix/execute \
  -H "Content-Type: application/json" \
  -d '{
    "text": "apples\npears",
    "number_lines": true
  }'

const response = await fetch('https://api.findutils.com/api/tools/line-prefix-suffix/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"text":"apples\npears","number_lines":true}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/line-prefix-suffix/execute",
    json={"text":"apples\npears","number_lines":True},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/line-prefix-suffix/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"text":"apples\npears","number_lines":true}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call line_prefix_suffix from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: line-prefix-suffix
MCP name: line_prefix_suffix
Category: Text
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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