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Status and roadmap

Implemented

  • Frontends — Go structs with tagless inference, YAML specs and CLI (synth gen), OpenAPI-driven payloads, SQL DDL, JSON Schema, Avro, Protobuf, and real-data profiling.
  • Coherence — referential integrity (Ref), temporal causality (after=/gap= lifecycle ordering), unique constraints (unique tag, PKs), OneToMany cardinality, nested structs and slices generated recursively, and locale coherence (country → region → city → postcode → phone).
  • Validity — Luhn-valid cards (HUMO/UZCARD), mod-97 IBANs, and gender-coherent names.
  • Statistics — Normal/LogNormal/Exponential/Zipf/Weighted distributions and chaos injection (WithChaos).
  • Coverage — 264 field types across 52 locales (native names, dialing codes, currencies, capital regions), plus real-world datasets — recognizable values blended with combinatorial ones so repetition stays low across large datasets.
  • Custom types — Register/RegisterSet for your own values.
  • Engine — deterministic per-record RNG, parallel generation, and CSV/JSONL/SQL encoders with streaming.

Roadmap

  • Locale datasets for the culturally-specific catalog types beyond the ten locales currently covered.
  • Protobuf map<k,v> fields.

Out of scope

Network sinks (Kafka, Postgres) are intentionally out of scope — Synth stays a pure provider; feed its output to your own loader. See Real-time pacing for the streaming-test shape that does not require Synth to hold a connection.