Languages · Data API

World Language Codes

Standard two-letter codes for the world's languages and their English names.

The ISO 639-1 list of two-letter language codes mapped to their English language names. Developers use it for localisation, translation pipelines, content tagging and letting AI agents validate or convert language identifiers.

Get API keyView docs

Source: datasets/language-codes (ISO 639-1 via Library of Congress) · ODC-PDDL-1.0 · Language code data from the datasets/language-codes project (github.com/datasets), based on ISO 639 lists published by the Library of Congress

Endpoints

Every request is authenticated with your X-API-Key and counted against your plan.

  • GET /v1/data/world-language-codes
  • GET /v1/data/world-language-codes/search?q=...
  • GET /v1/data/world-language-codes/{key}

Base path /v1/data/world-language-codes · full reference in the interactive docs. Also exposed as an MCP tool for AI agents.

Fields

FieldTypeDescription
alpha2strISO 639-1 two-letter language code
englishstrEnglish name of the language

What you get

Full ISO 639-1 two-letter code list
Code-to-name lookup
Name search to find a code
Lightweight reference for input validation

FAQ

Does it include three-letter codes?
This endpoint serves the two-letter ISO 639-1 codes only.
Are language names localised?
Names are provided in English.

Pricing

Simple, transparent pricing

Start free, upgrade when you need more. All plans include full API access.

Free

$0forever

Get started and explore the API

100 requests/day
  • 100 API requests per day
  • All endpoints included
  • Community support
Get Started
Most popular

Pro

$9/month

For production apps and AI agents

10,000 requests/day
  • 10,000 API requests per day
  • All endpoints included
  • Priority support
  • Usage dashboard
Upgrade to Pro

Enterprise

$49/month

Unlimited access for high-volume use

Unlimited requests
  • Unlimited API requests
  • All endpoints included
  • Priority support
  • Usage dashboard
  • Dedicated support channel
Go Enterprise

Getting Started

Start building in minutes

Register for a free API key, make your first request, and upgrade when you're ready.

1

Register

Create an account to get your API key. It's free — no credit card required.

curl -X POST https://api.aristocles.com.au/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com", "name": "Your Name"}'
2

Make a request

Use your API key in the X-API-Key header to authenticate requests.

curl https://api.aristocles.com.au/v1/data/asx \
  -H "X-API-Key: your_api_key_here"
3

Upgrade

Need more requests? Upgrade to Pro or Enterprise — you'll be redirected to Stripe Checkout.

curl -X POST "https://api.aristocles.com.au/v1/billing/checkout?tier=pro" \
  -H "X-API-Key: your_api_key_here"
4

Check usage

Monitor your daily request count and remaining quota at any time.

curl https://api.aristocles.com.au/v1/usage \
  -H "X-API-Key: your_api_key_here"