Crate llm_output_parser 

LLM Output Parser

Production-grade parser for extracting structured data from LLM responses. Handles think blocks, markdown fences, malformed JSON, and other real-world model output patterns without requiring an additional LLM call.

Parsers Available

Parser	Use Case
parse_json	Extract typed JSON structs
parse_json_value	Extract untyped JSON
parse_string_list	Extract cleaned string lists (tags, items)
parse_string_list_raw	Extract string lists without cleaning
parse_xml_tag	Extract content from an XML tag
parse_xml_tags	Extract content from multiple XML tags
parse_choice	Extract a choice from valid options
parse_number	Extract a numeric value
parse_number_in_range	Extract a bounded numeric value
parse_text	Clean text extraction
parse_yaml	Extract typed YAML (feature: yaml)

Traced Variants

Parser	Use Case
parse_json_with_trace	JSON extraction with diagnostic trace
parse_json_value_with_trace	Untyped JSON with diagnostic trace
parse_string_list_with_trace	List extraction with diagnostic trace
parse_xml_tag_with_trace	Single XML tag extraction with trace
parse_xml_tags_with_trace	Multi-tag XML extraction with trace
parse_choice_with_trace	Choice extraction with trace
parse_number_with_trace	Numeric extraction with trace
parse_number_in_range_with_trace	Bounded numeric extraction with trace
parse_text_with_trace	Text cleanup with trace

Configuration

Type	Purpose
ParseOptions	Safety limits and behavior toggles
ParseTrace	Diagnostic output from traced parse calls

Shared Utilities

Function	Purpose
strip_think_tags	Remove <think> blocks from text
try_repair_json	Fix common LLM JSON errors

Re-exports

pub use choice::parse_choice;

pub use choice::parse_choice_with_trace;

pub use error::ParseError;

pub use error::ParseOptions;

pub use error::ParseTrace;

pub use extract::preprocess;

pub use extract::strip_think_tags;

pub use json::parse_json;

pub use json::parse_json_value;

pub use json::parse_json_value_with_trace;

pub use json::parse_json_with_trace;

pub use list::parse_string_list;

pub use list::parse_string_list_raw;

pub use list::parse_string_list_with_trace;

pub use number::parse_number;

pub use number::parse_number_in_range;

pub use number::parse_number_in_range_with_trace;

pub use number::parse_number_with_trace;

pub use repair::try_repair_json;

pub use text::parse_text;

pub use text::parse_text_with_trace;

pub use xml::parse_xml_tag;

pub use xml::parse_xml_tag_with_trace;

pub use xml::parse_xml_tags;

pub use xml::parse_xml_tags_with_trace;

Modules

choice

Choice extraction from LLM responses.

error

Error types and configuration for LLM output parsers.

extract

Shared extraction strategies for LLM output parsing.

json

Typed JSON extraction from LLM responses.

list

String list extraction from LLM responses (generalized parse_tags).

number

Numeric value extraction from LLM responses.

repair

Deterministic JSON repair for common LLM output errors.

text

Clean text extraction from LLM responses.

xml

XML-style tag extraction from LLM responses.