Dictionaries APIs

Language dictionaries and translations

13 APIs in this category
13
APIs listed
5
need no API key (38%)
3
CORS enabled (23%)
12
HTTPS (92%)

This directory lists 13 dictionaries APIs. 1 of them require no API key and support CORS, so you can call them directly from browser JavaScript with no backend and no sign-up. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 13 of 13 APIs

Chinese Character Web

Chinese character definitions, pronunciations, and stroke data

Auth: No HTTPS CORS: No

Chinese Text Project

Digital library and dictionary for pre-modern Chinese texts

Auth: No HTTPS CORS: Unknown

Collins

Bilingual dictionary and thesaurus data from Collins

Auth: apiKey HTTPS CORS: Unknown

Free Dictionary

Open-source dictionary API providing definitions, examples, and synonyms

Auth: No HTTPS CORS: Unknown

Indonesia Dictionary

Kamus Besar Bahasa Indonesia (KBBI) API for Indonesian word definitions

Auth: No HTTPS CORS: Unknown

Lingua Robot

Word meanings, pronunciations, synonyms, antonyms, and grammatical data

Auth: apiKey HTTPS CORS: Yes

Merriam-Webster

Comprehensive dictionary and thesaurus API

Auth: apiKey HTTPS CORS: Unknown

OwlBot

Simple dictionary API with examples, pronunciation, and images

Auth: apiKey HTTPS CORS: Yes

Oxford

Access word definitions, translations, and grammar data from Oxford Dictionaries

Auth: apiKey HTTPS CORS: No

Synonyms

Retrieve synonyms, antonyms, and related words via API

Auth: apiKey HTTPS CORS: Unknown

Wiktionary

Collaborative, multilingual dictionary data from Wikimedia

Auth: No HTTPS CORS: Yes

Wordnik

Large-scale English dictionary API with word definitions and usage examples

Auth: apiKey HTTPS CORS: Unknown

Words

Definitions, examples, and synonyms for over 150,000 words

Auth: apiKey HTTPS CORS: Unknown

Best Dictionary and Translation APIs for Developers

A dictionary API allows developers to fetch word definitions, phonetic pronunciations, etymologies, synonyms, and translations programmatically. These APIs are essential for building vocabulary apps, language learning tools, and content enrichment pipelines.

CodeHelper's curated dictionary API collection includes APIs covering English definitions, multilingual translations, thesaurus data, and linguistic metadata.

What to look for in a dictionary API

  • Language coverage: For multilingual apps, confirm the API supports all languages your users need with quality definitions.
  • Audio pronunciations: APIs that include audio pronunciation files enhance language learning and accessibility features.
  • Part-of-speech tagging: Grammatical metadata (noun, verb, adjective) enables advanced linguistic analysis and NLP pipelines.

How to use this API directory

  1. Browse the curated list of APIs below.
  2. Click any API to visit its documentation.
  3. Check the Auth column to understand what credentials you need.

Whether you are building a language learning app or a content enrichment tool, this free curated API directory saves you hours of research.

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