JSON → SQL CREATE TABLE

Client

Paste a JSON array of objects with overlapping keys—get a draft CREATE TABLE with inferred types for SQLite or PostgreSQL. Pair with JSON → SQL INSERT when you need rows, not just schema.

Learn more: JSON to CREATE TABLE

Emit a single CREATE TABLE with inferred column types from sample rows—SQLite INTEGER/REAL/TEXT or PostgreSQL with JSONB for nested objects.

Versus INSERT

The INSERT tool fills rows; this page sketches schema only. Add primary keys, indexes, and defaults in your migration workflow after reviewing inferred nullability.

JSON → SQL CREATE TABLE

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Infers column types from sample values: numbers (integer vs float), booleans, strings, and nested objects (JSONB in PostgreSQL, TEXT in SQLite). Column names are the sorted union of keys; nullability follows whether any row omits a key or uses null.

Common use cases

  • Sketch a table before loading fixture JSON into SQLite or Postgres with matching column types.
  • Compare inferred JSONB vs TEXT for nested fields before choosing a migration strategy.

Common mistakes to avoid

  • Treating one sample as production schema

    Sparse keys and optional fields may need NULL everywhere—edit constraints and primary keys after review.

FAQ

Is SQL generated on your servers?

No. CREATE TABLE text is built locally from the JSON you paste.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • json to create table online
  • infer sql ddl from json sample

More tools

Related utilities you can open in another tab—mostly client-side.