Grammar and spelling error detection and correction
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openapi: 3.2.0
info:
title: TextGears Grammar API
description: TextGears is a grammar checking and text analysis REST API providing spelling corrections, grammar error detection, readability scoring, language detection, text summarization, and custom dictionary management across 11 languages. The service processes over 10.8 million API requests daily with distributed infrastructure across Estonia, Singapore, and the United States.
version: 1.0.0
contact:
url: https://textgears.com
termsOfService: https://textgears.com/terms
license:
name: Commercial
url: https://textgears.com
servers:
- url: https://api.textgears.com
description: Auto-routing (recommended)
- url: https://eu.api.textgears.com
description: Europe
- url: https://us.api.textgears.com
description: United States
- url: https://sg.api.textgears.com
description: Asia (Singapore)
security:
- apiKeyQuery: []
- apiKeyHeader: []
tags:
- name: Grammar
description: Grammar and spelling error detection and correction
paths:
/grammar:
post:
operationId: checkGrammar
summary: Check grammar
description: Identifies spelling, grammar, style, and punctuation errors in the provided text with suggested corrections. Supports 11 languages and multiple English dialects.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/CheckRequest'
application/json:
schema:
$ref: '#/components/schemas/CheckRequest'
responses:
'200':
description: Grammar check result
content:
application/json:
schema:
$ref: '#/components/schemas/GrammarResponse'
example:
status: true
response:
errors:
- id: e492411846
offset: 5
length: 2
bad: is
better:
- am
type: grammar
description: Subject-verb agreement error
'400':
$ref: '#/components/responses/ErrorResponse'
/spelling:
post:
operationId: checkSpelling
summary: Check spelling
description: Focuses on widespread spelling mistakes only, offering a lighter-weight alternative to full grammar analysis.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/CheckRequest'
application/json:
schema:
$ref: '#/components/schemas/CheckRequest'
responses:
'200':
description: Spelling check result
content:
application/json:
schema:
$ref: '#/components/schemas/GrammarResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
/correct:
post:
operationId: correct
summary: Auto-correct text
description: Returns a corrected version of the input text with grammar and spelling errors automatically fixed.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/CheckRequest'
application/json:
schema:
$ref: '#/components/schemas/CheckRequest'
responses:
'200':
description: Auto-corrected text
content:
application/json:
schema:
$ref: '#/components/schemas/CorrectResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
/suggest:
post:
operationId: suggest
summary: Get text suggestions
description: Returns style and grammar improvement suggestions for the provided text.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/BaseRequest'
application/json:
schema:
$ref: '#/components/schemas/BaseRequest'
responses:
'200':
description: Text suggestions
content:
application/json:
schema:
$ref: '#/components/schemas/GrammarResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
/paraphrase:
post:
operationId: paraphrase
summary: Paraphrase text
description: Returns a paraphrased version of the provided text. Supports creativity level configuration.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/TransformRequest'
application/json:
schema:
$ref: '#/components/schemas/TransformRequest'
responses:
'200':
description: Paraphrased text
content:
application/json:
schema:
$ref: '#/components/schemas/TransformResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
/translate:
post:
operationId: translate
summary: Translate text
description: Translates the provided text to a specified target language.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/TranslateRequest'
application/json:
schema:
$ref: '#/components/schemas/TranslateRequest'
responses:
'200':
description: Translated text
content:
application/json:
schema:
$ref: '#/components/schemas/TransformResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
/split:
post:
operationId: splitSentences
summary: Split text into sentences
description: Splits the provided text into individual sentences.
tags:
- Grammar
requestBody:
required: true
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/BaseRequest'
application/json:
schema:
$ref: '#/components/schemas/BaseRequest'
responses:
'200':
description: Split sentences result
content:
application/json:
schema:
$ref: '#/components/schemas/SplitResponse'
'400':
$ref: '#/components/responses/ErrorResponse'
components:
schemas:
GrammarError:
type: object
properties:
id:
type: string
description: Unique error identifier
offset:
type: integer
description: Character offset of the error in the original text
length:
type: integer
description: Length of the error span in characters
bad:
type: string
description: The erroneous text
better:
type: array
items:
type: string
description: Suggested corrections
type:
type: string
description: Error type classification
enum:
- grammar
- spelling
- punctuation
- style
description:
type: string
description: Human-readable error description
GrammarResponse:
type: object
properties:
status:
type: boolean
description: Whether the request was successful
response:
type: object
properties:
errors:
type: array
items:
$ref: '#/components/schemas/GrammarError'
CheckRequest:
allOf:
- $ref: '#/components/schemas/BaseRequest'
- type: object
properties:
rules:
type: array
items:
type: string
description: Specific grammar rules to apply or exclude
BaseRequest:
type: object
required:
- text
properties:
text:
type: string
description: UTF-8 encoded text to analyze
language:
type: string
description: Language code (BCP 47 format)
default: en-US
example: en-US
enum:
- en-US
- en-GB
- en-ZA
- en-AU
- en-NZ
- fr-FR
- de-DE
- de-AT
- de-CH
- pt-PT
- pt-BR
- it-IT
- ar-AR
- ru-RU
- es-ES
- ja-JP
- zh-CN
- el-GR
key:
type: string
description: API authentication key (if not provided via header or query param)
ai:
type: boolean
description: Enable AI-enhanced analysis
default: false
whitelist:
type: array
items:
type: string
description: Words or phrases to exclude from error detection
dictionary_id:
type: string
description: Custom dictionary identifier to use for exception lookup
TransformResponse:
type: object
properties:
status:
type: boolean
response:
type: object
properties:
result:
type: string
description: Transformed text output
TransformRequest:
allOf:
- $ref: '#/components/schemas/CheckRequest'
- type: object
properties:
creativity:
type: number
description: Creativity level for paraphrasing (0.0 to 1.0)
minimum: 0
maximum: 1
SplitResponse:
type: object
properties:
status:
type: boolean
response:
type: object
properties:
sentences:
type: array
items:
type: string
CorrectResponse:
type: object
properties:
status:
type: boolean
response:
type: object
properties:
corrected:
type: string
description: The auto-corrected text
ErrorResponse:
type: object
properties:
status:
type: boolean
example: false
error_code:
type: integer
description: Error code
enum:
- 500
- 501
- 600
- 606
- 607
description:
type: string
description: Human-readable error description
TranslateRequest:
allOf:
- $ref: '#/components/schemas/TransformRequest'
- type: object
required:
- target_language
properties:
target_language:
type: string
description: Target language code for translation
example: fr-FR
responses:
ErrorResponse:
description: API error
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
invalidKey:
summary: Invalid API key
value:
status: false
error_code: 600
description: Invalid key
rateLimitExceeded:
summary: Rate limit exceeded
value:
status: false
error_code: 607
description: Request limit exceeded
securitySchemes:
apiKeyQuery:
type: apiKey
in: query
name: key
description: API key passed as a query parameter
apiKeyHeader:
type: http
scheme: basic
description: API key passed as HTTP Basic Authorization header value