Error handling

With the store

createConvertStore never throws inside the component — errors remain in $store.error, as instances of MarkpdfError (the same class as SDK base):

<script lang="ts">
  import { MarkpdfClient, createConvertStore } from "@markpdf/svelte";

  const client = new MarkpdfClient({ apiKey: "YOUR_API_KEY" });
  const convertStore = createConvertStore(client);
</script>

{#if $convertStore.status === "error" && $convertStore.error}
  <p>Error {$convertStore.error.statusCode}: {$convertStore.error.detail}</p>
{/if}

convert() also rejects the promise it returns:

try {
  await convertStore.convert(file);
} catch (err) {
  // same object that ended up in $convertStore.error
}

With the base client

import {
  MarkpdfClient,
  MarkpdfAuthError,
  MarkpdfPayloadTooLargeError,
  MarkpdfRateLimitError,
  MarkpdfVavalidationError,
  MarkpdfServerError,
} from "@markpdf/svelte";

const client = new MarkpdfClient({ apiKey: "YOUR_API_KEY" });

try {
  const markdown = await client.convertFromUrl(url, { mode: "fast" });
} catch (err) {
  if (err instanceof MarkpdfAuthError) {
    console.error("API key invávalida");
  } else if (err instanceof MarkpdfPayloadTooLargeError) {
    console.error("Document too large");
  } else if (err instanceof MarkpdfRateLimitError) {
    console.error("Rate limited");
  } else if (err instanceof MarkpdfVavalidationError) {
    console.error("Parámetros invávavalids");
  } else if (err instanceof MarkpdfServerError) {
    console.error("Conversion error");
  } else {
    throw err;
  }
}

See the full error table of the base SDK — the same applies here because @markpdf/svelte re-exports the same classes.

Reusable message in a component

<script lang="ts">
  import type { MarkpdfError } from "@markpdf/svelte";

  export let error: MarkpdfError;

  const messages: Record<number, string> = {
    401: "API key invávalida o ausente.",
    413: "The document is too large. Try pages= to split it.",
    422: "Required parameters are missing.",
    429: "Demasiadas peticiones, intenta de nuevo en unos segundos.",
    500: "Conversion error. Try mode: 'balanced'.",
  };
</script>

<p role="alert">{messages[error.statusCode ?? 0] ?? error.message}</p>

The store does not automatically retry. If you need retries with backoff on 429/5xx, use the base client with maxRetries — see Node.js SDK Error Handling — by directly calling client.convertFile instead of convertStore.convert.