marqeta-sdk

Production-grade TypeScript SDK for the Marqeta Core, Credit, and DiVA APIs.

• Full coverage: ~50 Core resources, the complete Credit platform (25 resources), and all 35 DiVA analytics views.
• Dual ESM/CJS builds with complete TypeScript declarations.
• Zero required runtime dependencies — uses Node 18+'s native fetch.
• Strict typing: exactOptionalPropertyTypes, noUncheckedIndexedAccess, and a typed error hierarchy.
• Automatic retry with exponential backoff + jitter, honoring Retry-After.
• Async-iterator pagination for streaming large result sets without loading everything into memory.
• Webhook signature verification and Gateway JIT Funding helpers built in.

Install

npm install marqeta-sdk

Requires Node.js 18 or later.

Quick start

import { MarqetaClient } from "marqeta-sdk";

const client = new MarqetaClient({
  applicationToken: process.env.MARQETA_APP_TOKEN!,
  adminAccessToken: process.env.MARQETA_ADMIN_TOKEN!,
  // baseUrl defaults to the sandbox; set this for production:
  // baseUrl: "https://your-program-api.marqeta.com/v3",
});

const user = await client.users.create({
  first_name: "Jane",
  last_name: "Doe",
  email: "jane@example.com",
});

const card = await client.cards.create({
  user_token: user.token,
  card_product_token: "cp_01",
});

console.log(`Issued card ending in ${card.last_four}`);

Pagination

Every list endpoint returns a PaginatedResponse<T>. Use the built-in helpers to avoid hand-rolling pagination loops:

// Collect everything into an array
const allUsers = await client.users.all();

// Stream lazily — only fetches the next page when you ask for it
for await (const txn of client.transactions.streamByUser(user.token)) {
  if (txn.amount > 1000) console.log("Large transaction:", txn.token);
}

// Fluent paginator
const recent = await client.cards
  .paginatorByUser(user.token)
  .withParams({ count: 50 })
  .take(10);

Error handling

All errors extend MarqetaError and carry structured detail:

import { MarqetaValidationError, MarqetaRateLimitError } from "marqeta-sdk";

try {
  await client.users.create({ email: "not-an-email" });
} catch (err) {
  if (err instanceof MarqetaValidationError) {
    console.error(err.fieldErrors); // [{ field: "email", message: "..." }]
  } else if (err instanceof MarqetaRateLimitError) {
    console.error(`Retry after ${err.retryAfterMs}ms`);
  } else {
    throw err;
  }
}

Error class	HTTP status	Retryable
MarqetaValidationError	400, 422	No
MarqetaAuthenticationError	401	No
MarqetaAuthorizationError	403	No
MarqetaNotFoundError	404	No
MarqetaConflictError	409	No
MarqetaRateLimitError	429	Yes
MarqetaServerError	500+	Yes
MarqetaNetworkError	—	Yes
MarqetaDecodeError	—	No

Retryable errors are retried automatically (3 attempts by default, exponential backoff with jitter). Configure via maxRetries, retryBaseDelayMs, retryMaxDelayMs, and retryJitter in the client config.

Webhooks

import { verifyWebhookSignature, parseWebhookEvent, isTransactionEvent } from "marqeta-sdk";

app.post("/webhooks/marqeta", express.raw({ type: "*/*" }), (req, res) => {
  const signature = req.headers["x-marqeta-signature"] as string;

  if (!verifyWebhookSignature(req.body, signature, process.env.WEBHOOK_SECRET!)) {
    return res.status(401).send("Invalid signature");
  }

  const event = parseWebhookEvent(req.body);
  if (isTransactionEvent(event)) {
    // handle transaction.* events
  }

  res.sendStatus(200);
});

Gateway JIT Funding

import { isActionable, buildApproval, buildDecline, buildAck, getUserToken, getAmount } from "marqeta-sdk";

app.post("/jit", express.json(), async (req, res) => {
  const request = req.body;

  if (!isActionable(request)) {
    return res.json(buildAck(request));
  }

  const balance = await getBalance(getUserToken(request));
  const response =
    balance >= getAmount(request)
      ? buildApproval(request)
      : buildDecline(request, "INSUFFICIENT_FUNDS");

  res.json(response);
});

Credit platform

const account = await client.credit.accounts.create({
  user_token: user.token,
  bundle_token: "bundle_01",
  credit_limit: 500000, // cents
});

const balance = await client.credit.accounts.balance(account.token);

await client.credit.payments.create(account.token, {
  amount: 10000,
  payment_source_token: paymentSource.token,
});

DiVA analytics

// Core views
for await (const auth of client.diva.authorizations.stream({ start_date: "2025-01-01" })) {
  // process each authorization record
}

// Credit views (nested under .credit)
const statements = await client.diva.credit.statements.all({ start_date: "2025-01-01" });

Telemetry

import { consoleLogger } from "marqeta-sdk";

const client = new MarqetaClient({
  applicationToken: "...",
  adminAccessToken: "...",
  onRequest: consoleLogger.onRequest,
  onResponse: consoleLogger.onResponse,
  onRetry: consoleLogger.onRetry,
});

Or supply your own handlers for structured logging / APM integration.

Configuration reference

Option	Default	Description
applicationToken	—	Required.
adminAccessToken	—	Required.
baseUrl	sandbox URL	API base URL.
timeout	30000	Per-request timeout (ms).
maxRetries	3	Max retry attempts for transient errors.
retryBaseDelayMs	500	Initial backoff delay.
retryMaxDelayMs	10000	Backoff ceiling.
retryJitter	true	Add random jitter to backoff delays.
defaultHeaders	{}	Headers merged into every request.
onRequest / onResponse / onRetry	—	Telemetry hooks.

Development

npm install
npm run build      # dual ESM + CJS + .d.ts
npm test           # Jest
npm run lint
npm run typecheck
npm run ci          # full pipeline: lint + format:check + typecheck + test:coverage

License

MIT