ISO 639 language reference (direction + native name) API

Given an ISO 639-1/2/3 code or a name, return the cross-walked codes plus English name, native (endonym) name, default script, and writing direction (ltr/rtl) — the value-add for rendering localized text. Answers '639-3 code for English', 'is Arabic RTL', 'native name of de', 'language for code zh'.

Price$0.01per request

MethodPOST

Route/v1/ref/language

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

reflanguageiso-639localertlltrnative-namescript

API URLhttps://x402.hexl.dev/v1/ref/language

Integration docs

Example request

{
  "query": "ar"
}

Example response

{
  "query": "ar",
  "found": true,
  "iso1": "ar",
  "iso2": "ara",
  "iso3": "ara",
  "name": "Arabic",
  "nativeName": "العربية",
  "script": "Arabic",
  "direction": "rtl"
}

Input schema

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "examples": [
        "en",
        "ara",
        "Chinese"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}