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Free Dictionaries APIs with no API key

7 Dictionaries APIs that need no API key, account or credit card. 3 of them also allow CORS, so you can call them straight from browser JavaScript. Listed by uptime and ease of use.

  1. 1Random Lexicon logo

    Random Lexicon API

    Online · 592 ms

    Random words and definitions using optional filters.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  2. 2Wiktionary logo

    Wiktionary API

    Online · 942 ms

    Collaborative dictionary data. A free dictionaries API by Wiktionary.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  3. 3WordSoHard logo

    WordSoHard API

    Online · 500 ms

    Word definitions with Scrabble validity and tile score in one call, built for word games.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  4. 4Free Dictionary logo

    Free Dictionary API

    Online · 620 ms

    Definitions, phonetics, pronunciations, parts of speech, examples, synonyms.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  5. 5Chinese Text Project logo

    Chinese Text Project API

    Online · 860 ms

    Online open-access digital library for pre-modern Chinese texts.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  6. 6Chinese Character Web logo

    Chinese Character Web API

    Online · 505 ms

    Chinese character definitions and pronunciations.

    • No API key needed
    No authNo HTTPSNo CORS
  7. 7

    Indonesia Dictionary API

    Last check failed

    Indonesia dictionary many words. A free dictionaries API by new-kbbi-api.herokuapp.com.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?

Keyless Dictionaries APIs compared

Dictionaries APIs with no API key
APIAPI keyHTTPSCORSUptimeResponseRating
Random Lexicon logoRandom LexiconNoYesYesUp592 msNot rated
Wiktionary logoWiktionaryNoYesYesUp942 msNot rated
WordSoHard logoWordSoHardNoYesYesUp500 msNot rated
Free Dictionary logoFree DictionaryNoYesUnknownUp620 msNot rated
Chinese Text Project logoChinese Text ProjectNoYesUnknownUp860 msNot rated
Chinese Character Web logoChinese Character WebNoNoNoUp505 msNot rated
Indonesia DictionaryNoYesUnknownDown–Not rated

See also: best Dictionaries APIs · all 15 Dictionaries APIs · every API with no key

FAQ

Are there free Dictionaries APIs without an API key?

Yes. 7 free Dictionaries APIs need no API key or sign-up, including Random Lexicon API, Wiktionary API and WordSoHard API. You can send a request straight away.

Which keyless Dictionaries APIs can I call from JavaScript in the browser?

3 of them also support CORS, including Random Lexicon API, Wiktionary API and WordSoHard API, so a plain fetch from a web page works.

Do APIs without a key have limits?

Usually, yes. Keyless APIs typically rate-limit by IP address, so cache responses and avoid tight loops. For production traffic, an API with a free key tier often gives higher, more predictable limits.