JFPJSON Format Plus

JSON Schema Generator

Generate a practical starting schema from an example object or array. The tool detects objects, arrays, strings, booleans, integers, numbers, and null values, then marks observed object keys as required.

JSON Schema Generator

Infer a draft 2020-12 schema from representative sample data.

LocalWaitingIn lines 0In chars 0Out lines 0Out chars 0
Sample JSON0 lines
Output0 lines
1Ready. Load an example or paste JSON to begin.
Ready. Load an example or paste JSON to begin.

Parse summary

Root
-
Keys
-
Depth
-
Size
-

Type counts

strings -numbers -booleans -nulls -objects -arrays -

Structure preview

No valid JSON preview.

Data handling notes

  • Schema inference runs locally and never uploads the sample.
  • The result targets JSON Schema draft 2020-12.
  • A generated schema is a starting point; review optional fields, formats, ranges, and mixed arrays manually.

FAQ

Can one sample reveal every valid shape?No. Inference only sees the supplied values, so optional fields and alternative types need manual review.
Which schema draft is used?The generated root references JSON Schema draft 2020-12.