Fastify llms.txt · AI Docs Browser · mdream [llms.txt Tools](https://mdream.dev/llms-txt/fastify/llms-txt) # Fastify llms.txt Browse Fastify documentation as markdown. Click any page in the sidebar to view it, or copy the full llms.txt for your AI tools. fastify.dev/llms.txt [Raw llms.txt](https://fastify.dev/llms.txt) [Raw llms-full.txt](https://fastify.dev/llms-full.txt) Copy Markdown [](https://fastify.dev/llms.txt) llms.txt benchmarks Benchmarks contribute Join the Fastify community ecosystem Plugins organizations Organizations using Fastify resources Resources search Search the documentation docs Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Ecosystem Fluent-Schema Getting-Started V3 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Reply Request Routes Server TypeScript Validation-and-Serialization Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings Introduction Index Benchmarking Contributing To Fastify Database Delay Accepting Requests Detecting When Clients Abort Ecosystem Fluent-Schema Getting-Started V3 Migration Guide V4 Migration Guide V5 Migration Guide The hitchhiker's guide to plugins Prototype-Poisoning Recommendations Serverless Fastify Style Guide Testing How to write a good plugin Write-Type-Provider Index ContentTypeParser Decorators Encapsulation Errors Hooks HTTP2 Lifecycle Logging LTS Middleware Plugins Technical Principles Reply Request Routes Server Type-Providers TypeScript Validation-and-Serialization Warnings ## What is Fastify's llms.txt? Fastify publishes an `/llms.txt` file that provides AI systems with a structured index of its documentation. It follows the [llms.txt specification](https://llmstxt.org), organizing links to guides, API references, and tutorials under section headings so that LLMs like ChatGPT, Claude, and Gemini can quickly understand what Fastify offers and where to find details. Pass Spec 7 Sections 585 Links 48.0 KB Size ~12.3k Tokens Sections: benchmarks · contribute · ecosystem · organizations · resources · search · and 1 more ## Add Fastify Docs to Your AI Assistant Select your tool to see how to add Fastify's llms.txt as a documentation source. Cursor Windsurf Claude Code ChatGPT Zed Copilot 1. 1 Open any chat or composer panel 2. 2 Type @Docs and select "Add new doc" 3. 3 Paste the URL: https://fastify.dev/llms.txt 4. 4 Wait for the green dot (indexing complete) 5. 5 Reference @Docs in chat when asking about Fastify Cursor crawls the URL and indexes all subpages. Add a trailing slash to index child pages too. ## Spec Compliance 586 notes ## Frequently Asked Questions Where is Fastify's llms.txt file? Fastify publishes its llms.txt at https://fastify.dev/llms.txt. This file provides a structured, markdown-formatted index of Fastify's documentation that AI systems can consume to understand the project's APIs, guides, and references. How do I use Fastify's llms.txt with AI coding assistants? Copy the llms.txt content and paste it into your AI assistant (Cursor, Windsurf, Claude, ChatGPT) as context. This gives the AI an accurate map of Fastify's documentation so it can provide better code suggestions and answers about Fastify. What does Fastify's llms.txt contain? Fastify's llms.txt contains 7 sections and 585 documentation links in 48.0 KB (~12.3k tokens). Key sections include benchmarks, contribute, ecosystem, organizations, resources, search. How many tokens does Fastify's llms.txt use? The concise llms.txt index is approximately 12.3k tokens (48.0 KB). Most AI assistants can fit this within their context window. For the full expanded documentation, look for an llms-full.txt variant which embeds all content inline. What is Fastify? Fast and low overhead web framework, for Node.js. Fastify's llms.txt file helps AI systems understand this by providing a structured overview of its documentation, making it easier for developers to get accurate AI-assisted help when working with Fastify. Can I generate an llms.txt for my own project? Yes. Use the free llms.txt generator at mdream.dev/tools/llms-txt/generator to crawl your site and produce a spec-compliant llms.txt file. You can also validate existing files with the llms.txt validator. ## Browse More llms.txt Files [Checkly Docs Puppeteer example scripts for running Headless Chrome from Node.](https://mdream.dev/llms-txt/fastify/llms-txt/puppeteer-examples) [Unsloth Documentation Unsloth Studio is a web UI for training and running open models like Qwen, DeepSeek, gpt-oss and Gemma locally.](https://mdream.dev/llms-txt/fastify/llms-txt/unsloth) [MCP Toolbox for Databases - Documentation Index MCP Toolbox for Databases is an open source MCP server for databases. 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Validate your llms.txt against the official spec.](https://mdream.dev/llms-txt/fastify/tools/llms-txt/validator) © 2026 [Harlan Wilton](https://github.com/harlan-zw) · [MIT](https://github.com/harlan-zw/mdream/blob/main/license) [GitHub](https://github.com/harlan-zw/mdream) [Discord](https://discord.com/invite/275MBUBvgP)