vercel/ai pages

Foundations

Foundational AI Concepts

Providers and Models

prompts

tools

Streaming

Foundations

Getting Started

navigating-the-library

Next.js App Router Quickstart

Next.js Pages Router Quickstart

svelte-quickstart

Nuxt Quickstart

Node.js Quickstart

Expo Quickstart

Getting Started

Agents

agents-overview

Building Agents

workflow-patterns

Loop Control

Configuring Call Options

agents

Core Functions

overview

generating-text

generating-structured-data

tool-calling

mcp-tools

prompt-engineering

Settings

embeddings

reranking

Image Generation

transcription

speech

Language Model Middleware

provider-and-model-management

error-handling

Testing

telemetry

Core Features

UI Hooks & Components

overview

chatbot.mdx

chatbot-message-persistence

Resumable Streams

chatbot-tool-usage

generative-user-interfaces

useCompletion

useObject Hook

streaming-custom-data

error-handling

Transport

Reading UIMessage Streams

message-metadata

stream-protocols.mdx

UI Components

React Server Components

RSC Overview

Streaming React Components

managing-generative-ui-state

saving-and-restoring-states

multistep-interfaces

streaming-values

loading-state

error-handling

authentication

migrating-to-ui

RSC

Advanced Patterns

Prompt Engineering

stopping-streams

Backpressure

caching

Multiple Streamables

rate-limiting

rendering-ui-with-language-models

language-models-as-routers

Multistep Interfaces

sequential-generations

Vercel Deployment Guide

Advanced

API Reference

Core API Functions

generateText

streamText

generateObject

streamObject

embed

embedMany

rerank

generateImage

transcribe

generateSpeech

agent.mdx

ToolLoopAgent

createAgentUIStream

createAgentUIStreamResponse

pipeAgentUIStreamToResponse

tool

dynamicTool

createMCPClient

StdioMCPTransport

jsonSchema

zodSchema

valibotSchema

ModelMessage

UIMessage

validateUIMessages

safeValidateUIMessages

Provider Registry

customProvider

cosineSimilarity

wrapLanguageModel

LanguageModelV3Middleware

extract-reasoning-middleware

simulate-streaming-middleware

defaultSettingsMiddleware

stepCountIs

hasToolCall

simulateReadableStream

smoothStream

generateId

createIdGenerator

Core Functions Reference

UI Hooks & Streaming

useChat

useCompletion

useObject

convertToModelMessages

pruneMessages

createUIMessageStream

createUIMessageStreamResponse

pipeUIMessageStreamToResponse

readUIMessageStream

InferUITools

InferUITool

UI Hooks Reference

RSC API Reference

streamUI

createAI

createStreamableUI

createStreamableValue

readStreamableValue

getAIState

getMutableAIState

useAIState

useActions

useUIState

useStreamableValue

render-removed

RSC Reference

Stream Helpers

AIStream

StreamingTextResponse

streamToResponse

OpenAIStream

AnthropicStream

AWSBedrockStream

AWSBedrockAnthropicStream

AWSBedrockAnthropicMessagesStream

AWSBedrockCohereStream

AWSBedrockLlama2Stream

CohereStream

GoogleGenerativeAIStream

HuggingFaceStream

LangChain Adapter

LlamaIndex Adapter

MistralStream

ReplicateStream

InkeepStream

Stream Helpers

Error Classes

APICallError

DownloadError

EmptyResponseBodyError

InvalidArgumentError

InvalidDataContentError

InvalidDataContent Error

InvalidMessageRoleError

InvalidPromptError

InvalidResponseDataError

InvalidToolInputError

JSONParseError

LoadAPIKeyError

LoadSettingError

MessageConversionError

NoContentGeneratedError

NoImageGeneratedError

NoObjectGeneratedError

NoSpeechGeneratedError

NoSuchModelError

NoSuchProviderError

NoSuchToolError

NoTranscriptGeneratedError

RetryError

TooManyEmbeddingValuesForCallError

ToolCallRepairError

TypeValidationError

UnsupportedFunctionalityError

Error Reference

API Reference

Troubleshooting

azure-stream-slow

Client-Side Function Calls Not Invoked

Server Actions in Client Components

strange-stream-output

Streamable UI Errors

Tool Invocation Missing Result Error

Streaming Not Working When Deployed

Streaming Not Working When Proxied

Timeout on Vercel

Unclosed Streams

useChat Failed to Parse Stream

server-action-plain-objects-error

useChat No Response

useChat custom request options

typescript-performance-zod

useChat-error-occurred-masking

Repeated assistant messages in useChat

stream-abort-onfinish-callback

Tool calling with structured outputs

abort-breaks-resumable-streams

streamText-silent-failures

streaming-status-delay

useChat stale body data

onToolCall Type Narrowing

unsupported-model-version-error

object-generation-failed-with-openai

model-not-assignable-to-language-model-v1

TypeScript Cannot Find Namespace JSX

React Maximum Update Depth Exceeded

Jest Module Resolution for RSC

Troubleshooting

Introduction

AI SDK 6 Beta

Home / / / /

Command Palette

Search for a command to run

Command Palette

Search for a command to run

validateUIMessages

✓ Relevant

validateUIMessages: async validator for UI message arrays with optional Zod schemas for metadata, data parts, and tools

Made by Alexey with ❤️

human-index