Text Diff API

POST https://api.findutils.com/api/tools/text-diff/execute

Line-by-line diff of two strings using LCS. Returns structured chunks (equal / added / removed) plus a unified-diff-style text block and tallies.

Needs an API key. Running a tool needs an API key. Keys are not for sale yet: ask for early access. About API keys

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Request body

application/json

a

string required

Original text.
b

string required

Changed text.

Example arguments

Verified

{
  "a": "foo\nbar",
  "b": "foo\nbaz"
}

curl -X POST https://api.findutils.com/api/tools/text-diff/execute \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "a": "foo\nbar",
    "b": "foo\nbaz"
  }'

const response = await fetch('https://api.findutils.com/api/tools/text-diff/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json', Authorization: 'Bearer YOUR_API_KEY' },
  body: JSON.stringify({"a":"foo\nbar","b":"foo\nbaz"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/text-diff/execute",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"a":"foo\nbar","b":"foo\nbaz"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/text-diff/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json', 'Authorization: Bearer YOUR_API_KEY'],
    CURLOPT_POSTFIELDS => '{"a":"foo\nbar","b":"foo\nbaz"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call text_diff 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: API key
REST id: text-diff
MCP name: text_diff
Category: Text
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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