Grammar Check API

Overview

To use Grammar Check, you need an API key. You can get one by creating a free account and visiting your dashboard.

POST Endpoint

https://api.apiverve.com/v1/grammarcheck

Example

How to call the Grammar Check API in different programming languages.

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 response = 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"
})
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

payload = {
    "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
}

response = requests.post('https://api.apiverve.com/v1/grammarcheck', headers=headers, json=payload)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"
    "bytes"
    "encoding/json"
)

func main() {
    payload := map[string]interface{}{
        "text": "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
    }

    jsonPayload, _ := json.Marshal(payload)
    req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/grammarcheck", bytes.NewBuffer(jsonPayload))

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "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"
        ]
      }
    ]
  }
}

Authentication

The Grammar Check API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Grammar Check API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Grammar Check API:

Response

The Grammar Check API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <modified>true</modified>
    <corrected>The pig snorted when I saw it on the barn gate. I was a little mad because it woke up my puppy</corrected>
    <errorCount>3</errorCount>
    <corrections>
      <correction>
        <rule>repeated_word</rule>
        <message>Did you mean to repeat the word &quot;The&quot;?</message>
        <position>
          <start>0</start>
          <end>7</end>
        </position>
        <suggestions>
          <suggestion>The</suggestion>
        </suggestions>
      </correction>
      <correction>
        <rule>spelling</rule>
        <message>Did you mean &quot;because&quot;?</message>
        <position>
          <start>67</start>
          <end>74</end>
        </position>
        <suggestions>
          <suggestion>because</suggestion>
        </suggestions>
      </correction>
      <correction>
        <rule>spelling</rule>
        <message>Did you mean &quot;puppy&quot;?</message>
        <position>
          <start>92</start>
          <end>101</end>
        </position>
        <suggestions>
          <suggestion>puppy</suggestion>
        </suggestions>
      </correction>
    </corrections>
  </data>
</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 Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access Grammar Check through GraphQL to combine it with other API calls in a single request. Query only the grammar check data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  grammarcheck(
    input: {
      text: "The the pig snorted when I saw it on the barn gate. I was a little mad becuase it woke up my pupppppy"
    }
  ) {
    modified
    corrected
    errorCount
    corrections
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Grammar Check API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

Grammar Check requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The Grammar Check API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for Grammar Check

Official Grammar Check packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

Grammar Check works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

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