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Tools / JSON to SQL schema & insert generator

JSON to SQL schema & insert generator

Convert JSON documents or API responses into SQL CREATE TABLE DDL and batch INSERT statements. Automatically infers types for PostgreSQL, MySQL, and SQLite.

Runs entirely in your browser

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About this tool

When you have JSON data — an API response, an export, a document — and want it in a database, you need both a table to hold it and the rows to insert. This tool infers a SQL schema from JSON and generates the CREATE TABLE DDL plus batch INSERT statements, choosing appropriate types for PostgreSQL, MySQL or SQLite.

It reads the structure and values to infer sensible column types, so you get a working table definition and the inserts to populate it without writing either by hand. That is a fast way to load sample data, migrate JSON into a relational store, or prototype a schema from real data.

It runs in your browser, so your data is not uploaded. Use it to seed a database from JSON, turn an API response into rows, or draft a schema that matches data you already have.

Frequently asked questions

What does it generate from JSON?
A CREATE TABLE schema with inferred column types, plus batch INSERT statements to load the data, for PostgreSQL, MySQL or SQLite.
How does it choose column types?
It infers types from the JSON structure and values, mapping them to appropriate SQL types for the chosen database.
What is it useful for?
Seeding a database from JSON, migrating document data into a relational table, or prototyping a schema from a real API response.
Is my data uploaded?
No. It runs in your browser, so your JSON stays on your device.

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