Swiss qr reference validate

swiss-qr-reference-validate · version 1.0.0 · Identifiers & check digits · free, no key needed

Validate a 27-digit Swiss QR-bill QR reference's modulo-10-recursive check digit and reject all-zero references.

Use when you need to: validate a swiss qr bill reference number · check digit for a qrr reference · is this qr-bill reference valid.

Decide before calling

Read the versioned contract and the supported scope below. Reuse swiss-qr-reference-validate@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use swiss-qr-reference-validate@1.0.0 for validate a swiss qr bill reference number. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• validate a swiss qr bill reference number
• check digit for a qrr reference
• is this qr-bill reference valid
• verify a swiss payment slip reference before sending
• modulo 10 recursive check digit for a qr reference
• esr qrr reference checksum

Not supported

• the Swiss ISR/ESR 27-character reference of the older, non-QR payment slip format documented separately (same algorithm, but this tool only accepts the QR-bill QRR 27-digit shape)
• computing a new QR reference from a payload (this tool only validates)
• creditor information, IBAN/QR-IBAN, amount or debtor fields printed on the same QR-bill

Behavior

• Every ASCII space is removed from reference first; no other trimming and no case folding.
• If the space-stripped string's length is not 27 code points, valid:false, reason:'wrong_length', normalized:null, check_digit:null, print:null.
• Otherwise, if the space-stripped string does not match ^[0-9]{27}$, valid:false, reason:'invalid_character', normalized:null, check_digit:null, print:null.
• Otherwise normalized = the 27-digit string. print = normalized split into groups of 2,5,5,5,5,5 digits joined by a single space. check_digit = normalized[26] (echoed as given, not recomputed); these three fields are populated from here on regardless of validity.
• If normalized is 27 zero digits, valid:false, reason:'all_zero' (checked before the checksum, since an all-zero reference's checksum would otherwise pass).
• Modulo 10 recursive check: walk the first 26 digits with the mod10-recursive carry table (shared with checkdigit-compute/validate); expected_check_digit = (10 - carry) mod 10. If check_digit differs, valid:false, reason:"check_digit_mismatch". Otherwise valid:true, reason:null.

Input

• reference (string, required): min length 1; max length 40

Output

• valid (boolean, required)
• reason (one of null, "wrong_length", "invalid_character", "all_zero", "check_digit_mismatch", required)
• normalized (string or null, required): pattern ^[0-9]{27}$
• check_digit (string or null, required): pattern ^[0-9]$
• print (string or null, required): min length 32; max length 32

Limits

• max reference bytes: 40

Example

Request input:

{
  "reference": "210000000003139471430009017"
}

Response:

{
  "result": {
    "valid": true,
    "reason": null,
    "normalized": "210000000003139471430009017",
    "check_digit": "7",
    "print": "21 00000 00003 13947 14300 09017"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "swiss-qr-reference-validate",
  "version": "1.0.0",
  "input": {
    "reference": "210000000003139471430009017"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/swiss-qr-reference-validate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"reference":"210000000003139471430009017"}'

The machine-readable contract is at /v1/tools/swiss-qr-reference-validate/versions/1.0.0.

CLI

node cli.mjs run swiss-qr-reference-validate 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

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