Rewrote looksLikeMap from 6 layered heuristics down to 3 simple rules:
1. All numeric keys → map (certain)
2. Any key composed of words → struct (certain)
3. Everything else → map (safe default)
The asymmetry is deliberate: a map misidentified as a struct explodes
into hundreds of fields, while a struct misidentified as a map is
compact and easy to fix.
Word detection splits keys on _ and camelCase, checks segments for
pronounceability (vowel/consonant rhythm). Short words (id, at, on)
only count when paired with a strong 3+ char word.
Also adds raw path type naming with Item suffix for collections
(FriendsItem instead of Friend), real API test fixtures from PokeAPI
and SWAPI, and UUID-based test data replacing synthetic abc123 keys.
isBase64 matched common field names like "name" — too loose for map
detection. Replace with isPronounceable which checks vowel/consonant
rhythm: real field names have natural syllable structure (15-80% vowels,
no 5+ consonant runs), while tokens and IDs don't.
Also fix allLookLikeIDs to reject keys that don't match any ID pattern
instead of silently accepting them.
RawPaths walks JSON depth-first and emits flat paths with monotonically
numbered type names (Root0, People2, etc.). Each type intro immediately
precedes its fields, making the output streamable and order-stable.
Also improves map detection heuristics:
- All-numeric keys are always maps (even with 1-2 keys)
- Keys containing digits detected as IDs (e.g., emp_101)
- New isKnownFieldName with broad list of common field names
(timestamps, flags, relations, etc.) as strong struct signal
Separate library from CLI concerns:
- Add Resolver callback type with Decision/Response structs for all
interactive decisions (map/struct, type name, tuple/list, shape
unification, shape naming, name collision)
- Move terminal I/O (Prompter) from library to cmd/jsonpaths
- Add public API: New(), ParseFormat(), Generate(), AutoGenerate()
- Add Format type with aliases (ts, py, json-paths, etc.)
- Fix godoc comments to match exported function names
- Update tests to use scriptedResolver instead of Prompter internals
- Update doc.go and README with current API
Add tools/jsontypes library and tools/jsontypes/cmd/jsonpaths CLI.
Given a JSON sample (file, URL, or stdin), walks the structure,
detects maps vs structs, infers optional fields from multiple
instances, and produces typed definitions.
Output formats (--format):
- json-paths: flat type path notation (default)
- go: struct definitions with json tags and union support
- typescript: interfaces with optional/nullable fields
- jsdoc: @typedef annotations
- zod: validation schemas with type inference
- python: TypedDict classes
- sql: CREATE TABLE with FK relationships
- json-schema: draft 2020-12
- json-typedef: RFC 8927
Features:
- Interactive prompts for ambiguous structure (map vs struct, same
vs different types), with --anonymous mode for non-interactive use
- Answer replay: saves prompt answers to .answers files for iterative
refinement
- URL fetching with local caching and sensitive param stripping
- Curl-like auth: -H, --bearer, --user, --cookie, --cookie-jar
- Discriminated union support with sealed interfaces, unique-field
probing, and CHANGE ME comments for type/kind discriminators
- Extensive round-trip compilation tests for generated Go code
