llm-fmt

Reduces tokens by 30-70% for structured data in LLM contexts.

Usage

llm-fmt data.json                    # TOON output (default)
llm-fmt data.json -f tsv             # TSV (best for tables, 60-75% savings)
llm-fmt data.json -f yaml            # YAML (nested configs, 25-35%)
llm-fmt data.json --analyze          # Compare all formats

Filtering & Truncation

llm-fmt data.json -i "users[*].name"           # Extract paths
llm-fmt data.json --max-depth 3                # Limit nesting
llm-fmt data.json --max-items 50               # Limit arrays
llm-fmt data.json --max-string-length 200      # Limit strings
llm-fmt data.json --truncation-strategy tail   # head|tail|balanced|sample

Format Guide

Pipes

curl -s api.example.com/data | llm-fmt -f tsv
cat large.json | llm-fmt --max-items 100