Spell Check Client

microsoft · Developer Tools

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The Spell Check API - V7 lets you check a text string for spelling and grammar errors.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

POST The Bing Spell Check API lets you perform contextual grammar and spell checking. Bing has developed a web-based spell-checker that leverages machine learning and statistical machine translation to dynamically train a constantly evolving and highly contextual algorithm. The spell-checker is based on a massive corpus of web searches and documents.

The Bing Spell Check API lets you perform contextual grammar and spell checking. Bing has developed a web-based spell-checker that leverages machine learning and statistical machine translation to dynamically train a constantly evolving and highly contextual algorithm. The spell-checker is based on

https://api.apis.guru/v2/specs/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck?cc=example&mkt=example&Mode=proof&Text=example&DocId=example&UserId=example&AppName=example&SetLang=example&SessionId=example&ActionType=Edit&PreContextText=example&PostContextText=example&ClientMachineName=example

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

X-BingApis-SDK

true

curl -X POST "https://api.apis.guru/v2/specs/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck?cc=example&mkt=example&Mode=proof&Text=example&DocId=example&UserId=example&AppName=example&SetLang=example&SessionId=example&ActionType=Edit&PreContextText=example&PostContextText=example&ClientMachineName=example" \
  -H "X-BingApis-SDK: true"

import requests
params = {
    "cc": "example",
    "mkt": "example",
    "Mode": "proof",
    "Text": "example",
    "DocId": "example",
    "UserId": "example",
    "AppName": "example",
    "SetLang": "example",
    "SessionId": "example",
    "ActionType": "Edit",
    "PreContextText": "example",
    "PostContextText": "example",
    "ClientMachineName": "example"
}
headers = {
    "X-BingApis-SDK": "true"
}
response = requests.post(
    "https://api.apis.guru/v2/specs/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck');
url.searchParams.set('cc', 'example');
url.searchParams.set('mkt', 'example');
url.searchParams.set('Mode', 'proof');
url.searchParams.set('Text', 'example');
url.searchParams.set('DocId', 'example');
url.searchParams.set('UserId', 'example');
url.searchParams.set('AppName', 'example');
url.searchParams.set('SetLang', 'example');
url.searchParams.set('SessionId', 'example');
url.searchParams.set('ActionType', 'Edit');
url.searchParams.set('PreContextText', 'example');
url.searchParams.set('PostContextText', 'example');
url.searchParams.set('ClientMachineName', 'example');

const response = await fetch(url, {
  method: 'POST',
  headers: {
    'X-BingApis-SDK': 'true'
  },
}); 
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/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck")
	q := baseURL.Query()
	q.Set("cc", "example")
	q.Set("mkt", "example")
	q.Set("Mode", "proof")
	q.Set("Text", "example")
	q.Set("DocId", "example")
	q.Set("UserId", "example")
	q.Set("AppName", "example")
	q.Set("SetLang", "example")
	q.Set("SessionId", "example")
	q.Set("ActionType", "Edit")
	q.Set("PreContextText", "example")
	q.Set("PostContextText", "example")
	q.Set("ClientMachineName", "example")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("POST", targetURL, nil)
	req.Header.Set("X-BingApis-SDK", "true")

	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/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck")
uri.query = URI.encode_www_form({
  "cc" => "example",
  "mkt" => "example",
  "Mode" => "proof",
  "Text" => "example",
  "DocId" => "example",
  "UserId" => "example",
  "AppName" => "example",
  "SetLang" => "example",
  "SessionId" => "example",
  "ActionType" => "Edit",
  "PreContextText" => "example",
  "PostContextText" => "example",
  "ClientMachineName" => "example"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Post.new(uri)
req["X-BingApis-SDK"] = "true"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/microsoft.com/cognitiveservices-SpellCheck/1.0/spellcheck?" . http_build_query([
    "cc" => "example",
    "mkt" => "example",
    "Mode" => "proof",
    "Text" => "example",
    "DocId" => "example",
    "UserId" => "example",
    "AppName" => "example",
    "SetLang" => "example",
    "SessionId" => "example",
    "ActionType" => "Edit",
    "PreContextText" => "example",
    "PostContextText" => "example",
    "ClientMachineName" => "example"
]);
$opts = ["http" => [
    "method" => "POST",
    "header" => implode("\r\n", [
        "X-BingApis-SDK: true"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with Spell Check Client?

Spell Check Client is a Developer Tools API. Developers commonly use developer tools APIs for:

automating code review and quality checks
integrating CI/CD pipelines and build systems
managing feature flags and A/B tests
monitoring errors and application performance
generating and validating test data

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Spell Check Client is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗