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Look up a CPF with Node.js

Look up a CPF (Brazil's individual taxpayer ID) with Node.js using native fetch. No external dependencies, works with Node.js 18+.

Using Cursor, Lovable, v0 or another AI? Copy the Simple Lookup prompt and paste it into your assistant.

Open in Cursor

Before you start

  1. Create a free account at app.cpfhub.io: the Free plan includes 50 credits and does not ask for a card.
  2. Copy your API key from app.cpfhub.io/api-keys.
  3. Store the key in an environment variable, never in your code:
bash
export CPFHUB_API_KEY="your_api_key"

Example

JavaScript
// cpf-lookup.mjs
const cpf = '12345678909'

const res = await fetch(`https://api.cpfhub.io/cpf/${cpf}`, {
  headers: { 'x-api-key': process.env.CPFHUB_API_KEY },
  signal: AbortSignal.timeout(10_000),
})
const body = await res.json()

if (res.ok) {
  console.log(body.data.name, body.data.birthDate)
} else if (res.status === 404) {
  console.log('CPF not found (does not use a credit)')
} else if (res.status === 429) {
  console.log(`Per-minute limit reached. Try again in ${res.headers.get('retry-after')} s`)
} else {
  // error comes as text ("...") or as an object ({ message: "..." })
  const error = typeof body.error === 'string' ? body.error : body.error?.message
  throw new Error(`Error ${res.status}: ${error}`)
}

Save it as cpf-lookup.mjs and run it with node cpf-lookup.mjs. The .mjs extension lets you use await at the top level of the file.

Response

Found CPF (200, uses 1 credit):

JSON
{
  "success": true,
  "data": {
    "cpf": "12345678909",
    "name": "Fulano de Tal",
    "nameUpper": "FULANO DE TAL",
    "gender": "M",
    "birthDate": "15/06/1990",
    "day": 15,
    "month": 6,
    "year": 1990
  }
}

CPF not found (404, does not use a credit):

JSON
{
  "success": false,
  "data": null,
  "error": { "message": "CPF não encontrado na base de dados" }
}

The CPF 12345678909 is fictional, used only in the examples. gender can be null. The error.message text comes from the API in Portuguese ("CPF not found in the database").

Errors

StatusWhat it meansWhat to do
404CPF is not in the databaseTreat it as "not found". Does not use a credit.
400 / 422CPF does not have 11 digits or has an invalid check digitFix the input. Does not use a credit.
401Missing or invalid API keyCheck the CPFHUB_API_KEY variable.
403Credits used up or inactive accountCheck your balance with GET /quota or top up in the dashboard.
429Per-minute request limitWait the number of seconds in the Retry-After header and try again.
5xxTemporary failureTry again after a few seconds.

The error field can be text ("error": "...") or an object ("error": { "message": "..." }), depending on the status. The examples above handle both formats. Full list in Error Codes.

Next steps