Crate struct_llm 

struct-llm

A lightweight, WASM-compatible Rust library for generating structured outputs from LLMs using a tool-based approach.

Quick Start

use struct_llm::StructuredOutput;
use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize, StructuredOutput)]
#[structured_output(
    name = "sentiment_analysis",
    description = "Analyzes the sentiment of the given text"
)]
struct SentimentAnalysis {
    sentiment: String,
    confidence: f32,
    reasoning: String,
}

// Generate tool definition
let tool = SentimentAnalysis::tool_definition();

// Make API request with your HTTP client
let response = make_api_request_with_tools(&prompt, &[tool]).await?;

// Extract and validate structured response
let tool_calls = extract_tool_calls(&response, Provider::OpenAI)?;
let result: SentimentAnalysis = parse_tool_response(&tool_calls[0])?;

Re-exports

pub use error::Error;

pub use error::Result;

pub use provider::build_enforced_tool_request;

pub use provider::build_request_with_tools;

pub use provider::Provider;

pub use schema::validate as validate_schema;

pub use streaming::StreamParser;

pub use streaming::ToolDelta;

pub use tool::extract_tool_calls;

pub use tool::parse_tool_response;

pub use tool::ToolCall;

pub use tool::ToolDefinition;

Modules

error

Error types for struct-llm

provider

Provider-specific adapters for different LLM APIs

schema

JSON Schema generation and validation utilities

streaming

tool

Tool definition and parsing utilities

Structs

Message

Message in a conversation

Traits

StructuredOutput

Core trait for types that can be used as structured LLM outputs.

Derive Macros

StructuredOutput

Derive macro for StructuredOutput trait.