Token Efficient Data Format for LLMs | Dweve HEDL

HEDL names a table columns once and writes each record behind a pipe, so a table sent to a language model carries under half the bytes it does as JSON.

Choose the audience that matches your question

The page contains three selectable readings of the same subject.

For consumers

HEDL (Hierarchical Entity Data Language) is an open-source text format under Apache 2.0 for lists sent to LLMs. It writes the column labels once at the top, then keeps the same facts in each row.

For businesses

HEDL (Hierarchical Entity Data Language) is an open-source, token-efficient table format under Apache 2.0 for LLM requests. Start locally with cargo add hedl; repeated labels disappear while conversion stays local and reversible. In one measured run, 500 flat records were 48.7% smaller than minified JSON.

For engineers

HEDL (Hierarchical Entity Data Language) is an open-source, token-efficient text data format under Apache 2.0 for LLMs and structured records. Its Rust reader, writer, validators and servers keep the format inspectable and reversible.