Docs/APIs/Grammar Check

Grammar Check

Check grammar and spelling

OperationalCredits 10 per callp50 450msText ProcessingStar

Overview

Grammar Check works by analyzing the text provided and checking for grammatical and spelling errors. It uses various sources to determine the errors and returns the corrected text.

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

POSThttps://api.apiverve.com/v1/grammarcheck
curl -X POST https://api.apiverve.com/v1/grammarcheck \
  -H "x-api-key: your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
  "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
}'
const res = await fetch('https://api.apiverve.com/v1/grammarcheck', {
  method: 'POST',
  headers: {
    'x-api-key': 'your_api_key_here',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
}),
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);
import requests

res = requests.post(
    "https://api.apiverve.com/v1/grammarcheck",
    headers={"x-api-key": "your_api_key_here"},
    json={
    "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])
package main

import (
	"fmt"
	"io"
	"net/http"
	"strings"
)

func main() {
	body := strings.NewReader(`{
  "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
}`)
	req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/grammarcheck", body)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Parameters

Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them.

ParameterTypeDescription
textRequiredstringThe text you want to check for grammatical and spelling errors

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response
{
  "status": "ok",
  "error": null,
  "data": {
    "modified": true,
    "corrected": "The pig snorted when I saw it on the barn gate. I was a little mad because it woke up my puppy",
    "errorCount": 3,
    "corrections": [
      {
        "rule": "repeated_word",
        "message": "Did you mean to repeat the word \"The\"?",
        "position": {
          "start": 0,
          "end": 7
        },
        "suggestions": [
          "The"
        ]
      },
      {
        "rule": "spelling",
        "message": "Did you mean \"because\"?",
        "position": {
          "start": 67,
          "end": 74
        },
        "suggestions": [
          "because"
        ]
      },
      {
        "rule": "spelling",
        "message": "Did you mean \"puppy\"?",
        "position": {
          "start": 92,
          "end": 101
        },
        "suggestions": [
          "puppy"
        ]
      }
    ]
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

FieldTypeExampleDescription
modifiedbooleantrueIndicates whether any grammar or spelling errors were found
correctedstring"The pig snorted when I saw it on the barn gate. I was a little mad because it woke up my puppy"The text with grammar and spelling corrections applied
errorCountnumber3Total number of errors found in the text
correctionsPremiumarray[3]Array of corrections with details about each error
rulePremiumstring"repeated_word"The grammar rule that was violated
messagePremiumstring"Did you mean to repeat the word "The"?"Description of the error
positionPremiumobject{...}Start and end position of the error in the text
startPremiumnumber0
endPremiumnumber7
suggestionsPremiumarray[The]Suggested corrections for the error

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

StatusMeaningWhat to do
400Input was rejectedRead error; it names the parameter.
401Key missing or invalidCheck the header name and the key value.
403Key valid, but not permittedA key restriction or IP allow-list; see key scoping.
429Rate limited, or out of creditsRead error to tell them apart; see rate limits.

Other ways to use Grammar Check

Set up Grammar Check on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKitReference →
Use it in Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheetsReference →

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