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The @emailux/api-client package calls the EmailUX HTTP API: render (HTML by template) and deliver (render + send via a provider).

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Installation

npm install @emailux/api-client

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Default base URL

All requests use: https://render.emailux.com Override with baseUrl in the client options if you use a custom deployment. OpenAPI (Swagger): The live spec for your deployment is at {baseUrl}/swagger.json (for example https://render.emailux.com/swagger.json). Use it for the latest paths, headers, bodies, and response codes.

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Client options

OptionDescription
apiKeyRequired. Sent as x-api-key.
baseUrlOptional. Defaults to https://render.emailux.com (trailing slash is stripped).
defaultLocaleOptional. Default en-US; used when locale is omitted on deliver / render.
fetchImplementationOptional. Custom fetch (e.g. for tests or edge runtimes).
timeoutMsOptional. Request timeout via AbortSignal.
providerOne of sendgrid, gmail, or smtp. Affects deliver defaults (see below).
sendgridDomainRequired when using SendGrid (default provider). Your SendGrid-authenticated domain identifier.
Render in this package is only supported with a SendGrid domain configured (sendgridDomain is required for render()). Delivery can use SendGrid, Gmail, or SMTP via provider and optional per-call overrides. HTTP mapping: The client sends your domain as the x-sendgrid-domain header on render/deliver. The public API may also document this as x-domain; behavior depends on your EmailUX API version.

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render() — HTML only

Calls POST /v1/render with a JSON body:
  • experience_id (required)
  • version (optional)
  • locale (optional; falls back to defaultLocale)
  • data (object; defaults to {})

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Response codes (/v1/render)

StatusMeaning
200Success. JSON includes ok, html, subject.
400Validation error
401Unauthorized
404Not found
On success, the client returns { ok: true, status, html?, subject? }. On failure, { ok: false, status, error } with error.message and optional error.body.

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Example (SendGrid domain — required for render)

import { EmailUxApiClient } from '@emailux/api-client';

const client = new EmailUxApiClient({
  apiKey: process.env.EMAILUX_API_KEY!,
  sendgridDomain: 'mail.yourdomain.com', // your EmailUX / SendGrid domain
});

const result = await client.render({
  experienceId: 'welcome-email',
  version: 1,
  locale: 'en-US',
  data: { firstName: 'Ada' },
});

if (result.ok) {
  console.log(result.subject, result.html?.slice(0, 200));
} else {
  console.error(result.status, result.error);
}

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deliver() — render and queue send

Calls POST /v1/deliver with a JSON body:
  • experience_id (required)
  • tenant — not set by this client; use API keys and headers if your backend requires it when x-domain is omitted (see swagger.json for your deployment).
  • version, locale (optional)
  • channel_data (required): toEmail, fromEmail, optional toEmailName, fromEmailName
  • data (object; defaults to {})
Optional headers the client may send:
  • x-provider: gmail or smtp when using those providers (SendGrid uses the domain header path, so x-provider is omitted for SendGrid).

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Response codes (/v1/deliver)

StatusMeaning
200Success. JSON includes ok, message.
400Validation error
401Unauthorized
404Not found
502Provider error

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SendGrid

Default provider is SendGrid; sendgridDomain is required on the client. 
import { EmailUxApiClient } from '@emailux/api-client';

const client = new EmailUxApiClient({
  apiKey: process.env.EMAILUX_API_KEY!,
  provider: 'sendgrid',
  sendgridDomain: 'mail.yourdomain.com',
});

const result = await client.deliver({
  experienceId: 'order-confirmation',
  channelData: {
    toEmail: 'customer@example.com',
    toEmailName: 'Customer',
    fromEmail: 'orders@yourdomain.com',
    fromEmailName: 'Your Store',
  },
  data: { orderId: '12345' },
});

if (result.ok) {
  console.log(result.message);
} else {
  console.error(result.status, result.error);
}
You can omit provider: 'sendgrid'; the client still requires sendgridDomain for that configuration.

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Gmail

import { EmailUxApiClient } from '@emailux/api-client';

const client = new EmailUxApiClient({
  apiKey: process.env.EMAILUX_API_KEY!,
  provider: 'gmail',
});

const result = await client.deliver({
  experienceId: 'order-confirmation',
  channelData: {
    toEmail: 'customer@example.com',
    fromEmail: 'noreply@yourdomain.com',
  },
  data: { orderId: '12345' },
});
Per-call override: 
await client.deliver({
  ...params,
  provider: 'gmail',
});

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SMTP

import { EmailUxApiClient } from '@emailux/api-client';

const client = new EmailUxApiClient({
  apiKey: process.env.EMAILUX_API_KEY!,
  provider: 'smtp',
});

const result = await client.deliver({
  experienceId: 'order-confirmation',
  channelData: {
    toEmail: 'customer@example.com',
    fromEmail: 'noreply@yourdomain.com',
  },
  data: { orderId: '12345' },
});

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Errors and non-HTTP failures

  • HTTP 4xx / 5xx responses set ok: false and include status and error (with parsed body when JSON).
  • Network timeouts, aborts, or other thrown errors surface as ok: false, status: 0, and error.message from the thrown error.

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Requirements

Node.js >= 18 (native fetch).

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Source and license

Package source lives under packages/api-client in the EmailUX monorepo. License: MIT.