Congruence is a small utility that lets developers validate the shape and content of JavaScript objects by describing them with “semantic templates” – objects whose values are lodash type‑checking predicates (or literal values). It plugs in as a lodash 4+ mixin, providing `_.congruent` (exact key‑set match) and `_.similar` (partial match) functions useful for testing, config validation, or any code that needs concise, expressive object schema checks. Suitable for Node.js developers who already use lodash and want a lightweight, predicate‑based alternative to full‑blown schema libraries.