ISO 639-1 Language Code Lookup (Library of Congress Vocabulary)

locidlinked/language-code-lookup

Looks up a two-letter ISO 639-1 language code in the Library of Congress vocabulary and returns its linked-data description: the language's labels in English, German and French and the identifiers of its equivalents in the ISO 639-2 and MARC language vocabularies, with their three-letter codes. Returned as the JSON-LD graph the Library publishes, unmodified. Library of Congress data, a public domain data set served by Omnial; not an official Library of Congress product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

Library of Congress

Data from the Library of Congress Linked Data Service (id.loc.gov), made available by the Library of Congress as a public domain data set. Served by Eden Engine; not an official Library of Congress product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "locidlinked/language-code-lookup" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "locidlinked/language-code-lookup" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "locidlinked/language-code-lookup", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "locidlinked/language-code-lookup", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "code"
  ],
  "properties": {
    "code": {
      "type": "string",
      "pattern": "^[a-z]{2}$",
      "description": "A two-letter ISO 639-1 language code in lowercase, for example fr or de."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "@id": {
            "type": "string"
          },
          "@type": {
            "type": "array",
            "items": {
              "type": "string"
            }
          }
        },
        "description": "One graph node. `@id` identifies it, `@type` lists its types, and the remaining keys are full-URI properties such as the authoritative label, the code and the exact-match equivalents.",
        "additionalProperties": true
      }
    }
  },
  "description": "The Library of Congress JSON-LD graph for the code, one entry per node: the language itself, its ISO 639-2 and MARC equivalents, and blank nodes for variants and change history.",
  "additionalProperties": true
}