Text Analysis — entry 015 of 15
Watson Natural Language Understanding
IBM Watson Natural Language Understanding analyzes text for sentiment, entities, concepts, categories, and syntax using IBM's Watson models. It authenticates through IBM Cloud IAM — an API key exchanged for a bearer access token via a dedicated OAuth-style grant — and ships a free Lite plan for evaluation alongside metered paid tiers.
AuthenticationOAuthRequires an OAuth flow; expect app registration.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score54
Authentication8/25OAuth flow required
Pricing17/20Freemium tier available
Docs0/20No docs or spec available
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/watson-natural-language-understanding/"><img src="https://greatapis.com/badge/watson-natural-language-understanding.svg" alt="Scored 54 on greatapis.com"></a>Auth quickstart
- Register an app / run the OAuth flow to obtain a bearer token.
- Send it as an Authorization header
Authorization: Bearer <token>
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.