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fix(amazon-bedrock): preserve multibyte characters in streamed event payloads #19992

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fix(amazon-bedrock): preserve multibyte characters in streamed event payloads #19992

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36fbc22
fix(amazon-bedrock): preserve multibyte characters in streamed event …
Aug 29, 2026
453a2e0
chore: add changeset for Bedrock multibyte stream fix
Aug 30, 2026
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5 changes: 5 additions & 0 deletions .changeset/fix-bedrock-multibyte-stream-chars.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@ai-sdk/amazon-bedrock': patch
---

fix(amazon-bedrock): preserve multibyte characters in streamed event payloads
2 changes: 1 addition & 1 deletion packages/amazon-bedrock/src/amazon-bedrock-event-stream-decoder.ts
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Expand Up @@ -50,7 +50,7 @@ export function createAmazonBedrockEventStreamDecoder<T>(
const exceptionType = decoded.headers[':exception-type']?.value as
| string
| undefined;
const data = textDecoder.decode(decoded.body);
const data = textDecoder.decode(decoded.body, { stream: true });

await processEvent(
{ messageType, eventType, exceptionType, data },
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4 changes: 3 additions & 1 deletion packages/amazon-bedrock/src/anthropic/amazon-bedrock-anthropic-fetch.ts
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Expand Up @@ -68,6 +68,7 @@ function transformAmazonBedrockEventStreamToSSE(
body: ReadableStream<Uint8Array>,
): ReadableStream<Uint8Array> {
const textEncoder = new TextEncoder();
const textDecoder = new TextDecoder();

return createAmazonBedrockEventStreamDecoder(
body,
Expand All @@ -81,8 +82,9 @@ function transformAmazonBedrockEventStreamToSSE(
}
const bytes = (parsed.value as { bytes?: string }).bytes;
if (bytes) {
const anthropicEvent = new TextDecoder().decode(
const anthropicEvent = textDecoder.decode(
convertBase64ToUint8Array(bytes),
{ stream: true },
);
controller.enqueue(
textEncoder.encode(`data: ${anthropicEvent}\n\n`),
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