M
API Matrix

Datamuse API

⭐ Beginner's Pick Open Source Projects / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
82 Score
Grade A
Visit Official Site Compare Alternatives

Overview

Datamuse is a free word-finding API that helps you discover words by meaning, sound, spelling, and context — no API key needed. It is perfect for beginners who want to build vocabulary tools, word games, crossword helpers, or auto-complete features. Just send a query string and get back a ranked list of matching words.

💡

Beginner Tip

Use the "ml" parameter to find words with similar meaning (e.g., ?ml=ocean returns sea, water, etc.). No authentication is required, so you can start making requests directly from your browser.

Available Data

word definitions
pronunciation
synonyms and antonyms
example sentences
part of speech
Use case: Integrate word-finding query engine data into web and mobile applications

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from Datamuse",
    "description": "Word-finding query engine",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

word The matching word or phrase found by the query
score Relevance score — higher means a better match for your query parameters
tags Linguistic tags such as part of speech (n=noun, v=verb, adj, adv) or frequency info
numSyllables Number of syllables in the word (included when relevant to query type)
defs Short definitions prefixed by part of speech, returned when &md=d is added to the request

Implementation Example 

// ⚠️ Note: This URL may be a documentation page. Check official docs for actual API endpoint.
const url = "https://www.datamuse.com/api/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Empty results array The query term is too obscure or misspelled
✓ Try a more common synonym or check spelling; also verify the constraint parameters (ml, sl, sp) are not conflicting
Too many results returned No max parameter set — defaults to 100 results
✓ Add &max=10 (or any number 1-1000) to limit the response size
Unexpected characters in URL Query strings with spaces or special characters were not URL-encoded
✓ URL-encode your query, e.g. replace spaces with %20 or use encodeURIComponent() in JavaScript

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 15/20
🔒 Security 15/15
🛠 Developer XP 15/20
✓ Reliability 7/15
Response Time 209ms

Fully tested on Apr 5, 2026

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Open Source Projects
Difficulty Beginner
Verified: 2026-04-04

Similar APIs

View All →

Countly

77

Countly is an open-source product analytics platform, and its REST API lets you query event data, session metrics, user counts, and custom dashboards you have set up in your Countly instance.

No Auth Beginner 64ms

Drupal.org

55

The Drupal.org API gives you programmatic access to information about Drupal modules, projects, users, and releases hosted on drupal.org.

No Auth Beginner HTTPS 666ms

Evil Insult Generator

⭐ Beginner's Pick
87

The Evil Insult Generator API returns randomly generated humorous (fictional) insults in multiple languages — no API key required.

No Auth Beginner HTTPS 275ms

GitHub Contribution Chart Generator

⭐ Beginner's Pick
92

The GitHub Contribution Chart Generator API creates a visual representation of any GitHub user's contribution activity over the past year.

No Auth Beginner HTTPS 35ms

GitHub ReadMe Stats

⭐ Beginner's Pick
92

GitHub ReadMe Stats is an open-source API that generates dynamic SVG cards showing your GitHub statistics — repos, stars, commits, languages, and more.

No Auth Beginner HTTPS 48ms