TOON v4 is out. ♨️
The criticism was fair: on nested data, v3 lost to compact JSON. Same weather document: 204 tokens in v3 against 162 compact.
v4: 204 → 128.
apiful is a fetch client you compose. Your OpenAPI schema becomes .d.ts – no bundle overhead.
v5 adds:
✅ `apiful generate --check` fails on stale types
✅ .with() chains stay fast at any length
✅ your own extensions see the ones before them, typed
🔗 apiful.land
![Orange promo graphic titled "TOON v4 — The header now holds objects, not just single values." A code panel compares two versions: v3 needs nested indented lines per forecast entry (day, temp with min/max, condition, rainChance), while v4 declares all fields in one header line, `forecast[3]{day,temp{min,max},condition,rainChance}:`, followed by three compact CSV-style rows.](https://pbs.twimg.com/media/HRIw6TnWwAANfov?format=webp&name=large)
