Developer tool · Free · No sign-up
JSON to SQL Generator
Generate SQL CREATE TABLE schemas directly from JSON objects.
JSON Input
SQL Schema
CREATE TABLE [dbo].[Users] ( [Id] INT PRIMARY KEY IDENTITY(1,1), [id] INT, [name] NVARCHAR(255), [email] NVARCHAR(255), [age] INT, [isActive] BIT, [balance] DECIMAL(18,2), [createdAt] DATETIME );
About this tool
Stop manually mapping JSON fields to database columns. This tool parses your JSON payload, automatically infers the correct SQL data types (INT, NVARCHAR, BIT, DATETIME), and generates a clean CREATE TABLE script. It handles arrays and nested objects by safely converting them to JSON strings, making it perfect for rapid API-to-database integration.
Key features
Smart Type Inference
Automatically detects numbers, booleans, dates, and strings.
Nested Object Support
Safely converts nested JSON arrays and objects into NVARCHAR(MAX) columns.
SQL Server Ready
Generates clean T-SQL compatible scripts with sanitized column names.
How to use it
- 1Paste your JSON object or array of objects into the input area.
- 2Enter a name for your database table.
- 3View the generated SQL CREATE TABLE script on the right.
- 4Click copy to paste the script directly into SQL Server Management Studio or your database client.
Common use cases
- Creating initial database schemas from frontend API payloads.
- Rapidly prototyping backend tables for a new microservice.
- Analyzing the structure of third-party API responses for database design.
Frequently asked questions
What SQL dialect does this generate?
It generates T-SQL (SQL Server) compatible scripts, using types like NVARCHAR, BIT, and DATETIME. These are easily adaptable to PostgreSQL or MySQL if needed.
How does it handle nested JSON objects?
Nested objects and arrays cannot be directly mapped to standard relational columns. The tool converts them to NVARCHAR(MAX) so they can be stored as JSON strings in your database.
Is my JSON data sent to a server?
No. All parsing and SQL generation happens entirely in your browser. Your data is completely private.
Private and free. Most of our tools run entirely in your browser, so the data you enter isn't uploaded or stored. There's no sign-up, and there never will be — they're built by the Fusion Trail Solutions team to be genuinely useful.
Need a custom tool or web app?
We design and build production-grade web apps, internal tools and SaaS platforms. Tell us what you need.
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