Keyword Extraction API

Extract the key phrases and most frequent words of any text in 50+ languages (RAKE algorithm with language stopwords). Auto language detection, scores and counts.

Authentication & base URL

Subscribe through one of our marketplace listings; your marketplace API key and base URL are shown there. All endpoints return JSON over HTTPS, served from a global edge network (typically 20–150 ms).

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Endpoints

GET `/v1/keywords`

Extract keywords

Parameter	In	Description	Example
`text` *	query	Text to analyze (max 100,000 characters)	`Cloudflare Workers let developers deploy serverless code to a global edge network with low latency and automatic scaling.`
`lang`	query	ISO 639-1 language code or auto (default)	`auto`
`limit`	query	Max keyphrases and words (1-50, default 10)	`10`
`max_words`	query	Max words per keyphrase (1-5, default 3)	`3`

POST `/v1/keywords`

Extract keywords (long text in body)

Request body: text/plain

Parameter	In	Description	Example
`lang`	query	ISO 639-1 language code or auto	`auto`
`limit`	query	Max results (1-50)	`10`

Example

GET /v1/keywords?text=Cloudflare+Workers+let+developers+deploy+serverless+code+to+a+global+edge+network+with+low+latency+and+automatic+scaling.&lang=auto&limit=10&max_words=3

{
  "language": "en",
  "keyphrases": [
    {
      "keyword": "global edge network",
      "score": 9,
      "occurrences": 1
    },
    {
      "keyword": "cloudflare workers",
      "score": 4,
      "occurrences": 1
    },
    {
      "keyword": "automatic scaling",
      "score": 4,
      "occurrences": 1
    },
    {
      "keyword": "latency",
      "score": 1,
      "occurrences": 1
    }
  ],
  "topWords": [
    {
      "word": "cloudflare",
      "count": 1
    },
    {
      "word": "workers",
      "count": 1
    },
    {
      "word": "global",
      "count": 1
    },
    {
      "word": "edge",
      "count": 1
    },
    {
      "word": "network",
      "count": 1
    },
    {
      "word": "latency",
      "count": 1
    },
    {
      "word": "automatic",
      "count": 1
    },
    {
      "word": "scaling",
      "count": 1
    }
  ],
  "wordCount": 18,
  "method": "RAKE (Rapid Automatic Keyword Extraction) with language stopwords"
}

Extract the key phrases and most frequent words of any text in 50+ languages (RAKE algorithm with language stopwords). Auto language detection, scores and counts.

Use cases

SEO tags and meta keywords, article tagging, search indexing, topic discovery in reviews, auto-generated hashtags, content analytics.

Why this API

50+ languages with stopword lists (English, Spanish, French, German, Portuguese, Italian, Dutch, Russian…).
Key phrases (multi-word) plus single-word frequencies in one call.
Fast and deterministic: no AI costs.

Pricing

Free plan with 500 calls per month, then Pro (25,000 calls for $4.99/month) and Ultra (150,000 calls for $14.99/month). See all plans.