Online Tool Store
JSON to SQL Schema Generator
JSON to SQL Schema Generator drafts the columns and refuses to guess on arrays, because that is a modelling decision rather than a conversion.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Developer
JSON to SQL Schema Generator
Frontend preview — no upload or external service.
CREATE TABLE
A table with id as integer primary key, email as varchar(255), and the tags array flagged — either a JSON column or a separate join table, which is a modelling decision.
How the JSON to SQL Schema Generator works
- Paste a representative JSON sample including every optional field populated.
- Choose the dialect, since type names and JSON support differ substantially between them.
- Decide how nested structures are handled. A JSON column is quick; a separate table is usually right if you will ever query inside it.
FAQ
How are column types inferred?
From the sample values, which means the types are only as good as the sample. An integer that happens to be small becomes a small type, and a field that is null throughout cannot be typed at all.
Should nested objects become JSON columns?
Only if you will not query inside them. A JSON column is convenient and gives up indexing, constraints and joins. Anything you will filter or aggregate on belongs in its own table.
Does this handle arrays?
They are flagged rather than converted, because an array is a modelling decision — a join table, a JSON column, or a delimited string, and only the first is normalised.
How we compare
| Feature | Online Tool Store | A CLI script | An IDE plugin |
|---|---|---|---|
| Multiple dialects | ✓ | One | ✓ |
| Flags nested structures | ✓ | ✗ | ✗ |
| Nothing uploaded | ✓ | Local | ✗ |
| No install | ✓ | ✗ | ✓ |
JSON to SQL Schema Generator drafts the columns and refuses to guess on arrays, because that is a modelling decision rather than a conversion.