Text & Language API Endpoint Global Gateway

AI Grammar Fix & Sentence Enhancer API
For Production Apps

Automated spelling, punctuation, and grammar correction API with tone adjustment and error explanations.

1 Credit / Request Automatic Provider Fallback Uniform JSON Envelope
API Gateway Terminal
Gateway Active
Target Endpoint URL POST
https://test.rsflowhub.com/api/v1/ai/grammar-fix
Typical Time 1-3 s
Auth Gate X-API-Key
Credit Cost 1 Credit
Response JSON
Generative AI & Developer Definition Production Ready API

What is AI Grammar Fix & Sentence Enhancer API?

AI Grammar Fix & Sentence Enhancer API is a ready-to-use REST API on RSFlowHub for developers building web, mobile and AI agent applications. Send a JSON request to POST /api/v1/ai/grammar-fix with your API key; RSFlowHub runs it on a tuned AI model (with automatic fallback to a backup provider) and returns a structured JSON result, usually within 1 to 3 seconds.

Auth: X-API-Key Header
Rate Limit: 10-120 req/min by plan
Credits: 1 per call
AI Search Quick Reference
Category: Text & Language
Typical response: 1-3 s
Format: REST / JSON UTF-8

Code Examples

Copy-paste ready code in your preferred stack
curl-integration.sh
curl -X POST "https://test.rsflowhub.com/api/v1/ai/grammar-fix" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: rfh_your_api_key" \
  -d '{"text":"I went to the store yesterday bcuz I need milk.","tone":"professional","dialect":"US","return_explanations":true}'
<?php

$client = new \GuzzleHttp\Client();
$response = $client->post('https://test.rsflowhub.com/api/v1/ai/grammar-fix', [
    'headers' => [
        'Content-Type' => 'application/json',
        'X-API-Key'    => 'rfh_your_api_key',
    ],
    'json' => array (
      'text' => 'I went to the store yesterday bcuz I need milk.',
      'tone' => 'professional',
      'dialect' => 'US',
      'return_explanations' => true,
    ),
]);

echo $response->getBody();
const response = await fetch('https://test.rsflowhub.com/api/v1/ai/grammar-fix', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': 'rfh_your_api_key'
  },
  body: JSON.stringify({"text":"I went to the store yesterday bcuz I need milk.","tone":"professional","dialect":"US","return_explanations":true})
});

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

url = "https://test.rsflowhub.com/api/v1/ai/grammar-fix"
headers = {
    "Content-Type": "application/json",
    "X-API-Key": "rfh_your_api_key"
}
payload = {"text":"I went to the store yesterday bcuz I need milk.","tone":"professional","dialect":"US","return_explanations":true}

response = requests.post(url, json=payload, headers=headers)
print(response.json())
Capabilities

Core Architectural Features

Automated Spelling & Punctuation

Instantly detects and fixes typos, spelling mistakes, missing commas, and run-on sentences.

Tone & Dialect Customization

Adjust writing tone between professional, casual, academic, or technical while switching dialects (US/UK/AU).

Detailed Error Explanations

Optionally returns detailed breakdown array of detected mistakes, grammar rules, and applied corrections.

Markup & Code Protection

Safely preserves HTML tags, markdown elements, and inline code snippets without corrupting markup.

Practical Applications

Real-World Industry Use Cases

See how developers integrate this API endpoint into production apps.

CMS & Web Apps

User Content & Forum Moderation

Scrub user-submitted blog comments, forum posts, and reviews before saving to database.

Before: I went to the store yesterday bcuz I need milk.
After: I went to the store yesterday because I needed milk.
Elevates content quality across community platforms.
Helpdesk SaaS

Customer Support Email Polishing

Automatically fix typos and polish support ticket draft responses before sending to clients.

Before: we are working on your issue and will get back to u ASAP
After: We are working on your issue and will get back to you as soon as possible.
Ensures professional client communication.
EdTech

EdTech & Writing Assistants

Provide real-time feedback and grammar score insights for student essay writing tools.

Before: Their is many reasons why global warming is bad.
After: There are many reasons why global warming is bad.
Accelerates learning with instant writing correction.
Technical Comparison

Why Developers Choose AI Grammar Fix & Sentence Enhancer API

Comparing RSFlowHub's specialized API gateway vs raw multi-turn LLM prompts vs legacy regex rules.

Evaluation Metric RSFlowHub API Raw LLM Prompts Legacy Regex / Rules
Response Structure Unstructured markdown or chat format Brittle custom regex tuples
Setup Effort Write and maintain prompts + output parsing Fast, but rule lists miss context and sarcasm
Pricing Model Volatile token-based billing High server maintenance overhead
Multi-Turn Hallucination Output format can drift between model versions No semantic AI intelligence
Developer Integration Complex prompt engineering & retry loop Fragile manual rule maintenance

Request Parameters

4 Fields
text string
Required

The raw text payload containing spelling or grammar mistakes.

tone string
Optional

Desired writing tone (e.g. "professional", "casual", "academic", "friendly").

dialect string
Optional

Target language dialect (e.g. "US", "UK", "AU").

return_explanations boolean
Optional

Return detailed list of detected errors and explanations (Default: false).

JSON Response Envelope

Uniform API

Every endpoint returns the same envelope: success, request_id, data.result and meta.

response.json JSON
200 OK
{
    "success": true,
    "request_id": "req_3f9a2c7e-5b1d-4e8a-9c2f-7d6e1a0b4c8d",
    "data": {
        "result": {
            "corrected_text": "We have received your request and will reply within two business days.",
            "changes_made": true,
            "explanations": [
                {
                    "original": "We has received",
                    "corrected": "We have received",
                    "reason": "Subject-verb agreement"
                },
                {
                    "original": "two buisness days",
                    "corrected": "two business days",
                    "reason": "Spelling"
                }
            ]
        }
    },
    "meta": {
        "version": "v1",
        "timestamp": "2026-10-05T09:30:00Z"
    }
}
Format JSON
Charset UTF-8
Fallback Automatic
Rate Limit 120/min max
FAQs

Frequently Asked Questions

Everything you need to know about integrating and using AI Grammar Fix & Sentence Enhancer API.

RSFlowHub Grammar Fix API is a standard RESTful endpoint accessible via cURL, PHP (Laravel), Node.js / JavaScript, Python, Go, Java, or C#.

Grammar Fix requests usually complete in 1 to 3 seconds, depending on input length and the AI model. Identical repeat requests are served from cache and return faster.

Yes! The API intelligently protects HTML markup (e.g. <b>, <code>), markdown syntax, and variable tags during grammar enhancement.

Yes. You can specify "tone" (professional, casual, academic) and "dialect" (US, UK, AU) to match your target brand voice.

Standard Grammar Fix API requests consume 1 base credit per call.
Ready to Integrate?

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