LanguageTool API
languagetool · Company
Check texts for style and grammar issues with LanguageTool . Please consider the following default limitations: your daily request limit depending on your plan maximum number of requests per minute: 20 (free) / 80 (Premium) maximum number of characters per minute: 75,000 (free) / 300,000 (Premium) maximum number of characters per request: 20,000 (free) / 60,000 (Premium)
Authentication
No authentication requiredFree to use with no key needed.
Sample Requests
GET
List words in dictionaries
List words in the user's personal dictionaries.
https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words?dicts=example&limit=10&apiKey=example&offset=0&username=testuser
Hover any highlighted part to learn what it does
curl -X GET "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words?dicts=example&limit=10&apiKey=example&offset=0&username=testuser"
import requests
params = {
"dicts": "example",
"limit": "10",
"apiKey": "example",
"offset": "0",
"username": "testuser"
}
response = requests.get(
"https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words",
params=params,
)
print(response.json())const url = new URL('https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words');
url.searchParams.set('dicts', 'example');
url.searchParams.set('limit', '10');
url.searchParams.set('apiKey', 'example');
url.searchParams.set('offset', '0');
url.searchParams.set('username', 'testuser');
const response = await fetch(url);
const data = await response.json();
console.log(data);package main
import (
"fmt"
"io"
"net/http"
"net/url"
)
func main() {
baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words")
q := baseURL.Query()
q.Set("dicts", "example")
q.Set("limit", "10")
q.Set("apiKey", "example")
q.Set("offset", "0")
q.Set("username", "testuser")
baseURL.RawQuery = q.Encode()
targetURL := baseURL.String()
req, _ := http.NewRequest("GET", targetURL, nil)
client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require "net/http"
require "json"
uri = URI("https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words")
uri.query = URI.encode_www_form({
"dicts" => "example",
"limit" => "10",
"apiKey" => "example",
"offset" => "0",
"username" => "testuser"
})
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
req = Net::HTTP::Get.new(uri)
res = http.request(req)
puts JSON.parse(res.body)<?php
$url = "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/words?" . http_build_query([
"dicts" => "example",
"limit" => "10",
"apiKey" => "example",
"offset" => "0",
"username" => "testuser"
]);
$opts = ["http" => [
"method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));
GET
Get a list of supported languages.
Get a list of supported languages.
https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages
Hover any highlighted part to learn what it does
curl -X GET "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages"
import requests
response = requests.get(
"https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages",
)
print(response.json())const url = 'https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages'; const response = await fetch(url); const data = await response.json(); console.log(data);
package main
import (
"fmt"
"io"
"net/http"
)
func main() {
targetURL := "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages"
req, _ := http.NewRequest("GET", targetURL, nil)
client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require "net/http"
require "json"
uri = URI("https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages")
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
req = Net::HTTP::Get.new(uri)
res = http.request(req)
puts JSON.parse(res.body)<?php
$url = "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/languages";
$opts = ["http" => [
"method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));
POST
Check a text
The main feature - check a text with LanguageTool for possible style and grammar issues.
https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check
Hover any highlighted part to learn what it does
curl -X POST "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check"
import requests
response = requests.post(
"https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check",
)
print(response.json())const url = 'https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check';
const response = await fetch(url, {
method: 'POST',
});
const data = await response.json();
console.log(data);package main
import (
"fmt"
"io"
"net/http"
)
func main() {
targetURL := "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check"
req, _ := http.NewRequest("POST", targetURL, nil)
client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require "net/http"
require "json"
uri = URI("https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check")
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
req = Net::HTTP::Post.new(uri)
res = http.request(req)
puts JSON.parse(res.body)<?php
$url = "https://api.apis.guru/v2/specs/languagetool.org/1.1.2/check";
$opts = ["http" => [
"method" => "POST",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));Postman Setup Guide
- See official documentation for authentication and setup.
What can you build with LanguageTool API?
LanguageTool API is a Company API. Developers commonly use company APIs for:
- enriching CRM records with company firmographics
- building lead-generation and prospecting tools
- verifying business identity and registration details
- monitoring competitors and market intelligence
- powering B2B data enrichment pipelines
No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. LanguageTool API is free to use, making it a low-risk choice to experiment with.
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