ISSN validate API

Validates an ISSN mod-11 check character (digit or X) and derives its EAN-13/977 barcode. Answers 'Is this ISSN valid?', 'What is the EAN-13 barcode for this ISSN?'.

Price$0.02per request

MethodPOST

Route/v1/validate/issn

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

issnserialjournalcheck-digitmod-11validateean-13periodicalscholarly

API URLhttps://x402.hexl.dev/v1/validate/issn

Integration docs

Example request

{
  "issn": "0317-8471"
}

Example response

{
  "valid": true,
  "reason": "Valid ISSN (mod-11 OK); EAN-13 barcode derived.",
  "normalized": "0317-8471",
  "checkDigit": {
    "expected": "1",
    "actual": "1"
  },
  "gtin13": "9770317847001"
}

Input schema

{
  "type": "object",
  "required": [
    "issn"
  ],
  "properties": {
    "issn": {
      "type": "string",
      "description": "8-character ISSN (hyphen allowed).",
      "examples": [
        "0317-8471"
      ]
    }
  }
}

Output schema

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