SQL Input
This free online SQL Server to TypeScript Interfaces generator turns your CREATE TABLE DDL statements into ready-to-use TypeScript Interfaces instantly — with no server upload, no account, and no rate limits. Simply paste your SQL Server schema on the left and the generated TypeScript Interfaces code appears on the right in real time. All processing runs entirely in your browser using client-side JavaScript, keeping your database schema 100% private.
Code & Data Generator
Complete type mapping from SQL Server SQL column types to TypeScript Interfaces — including nullability, constraints, and gotchas.
| SQL Server Type | TypeScript Interfaces Type | Notes |
|---|---|---|
| INT IDENTITY(1,1) | number | Auto-increment PK |
| BIGINT IDENTITY(1,1) | number | Large auto-increment PK |
| INT | number | — |
| BIGINT | number | Use bigint for values > 2^53 |
| SMALLINT / TINYINT | number | — |
| FLOAT / REAL | number | — |
| DECIMAL(p,s) / NUMERIC(p,s) | number | Use string for exact financials |
| MONEY / SMALLMONEY | number | Consider string for accounting precision |
| VARCHAR(n) / NVARCHAR(n) | string | NVARCHAR is Unicode; both map to string |
| TEXT / NTEXT | string | Deprecated; prefer NVARCHAR(MAX) |
| NVARCHAR(MAX) | string | — |
| CHAR(n) / NCHAR(n) | string | — |
| BIT | boolean | SQL Server boolean type |
| DATETIME / DATETIME2 | Date | DATETIME2 has higher precision |
| DATETIMEOFFSET | Date | Includes timezone; parse with Date.parse() |
| DATE | string | Returns YYYY-MM-DD |
| TIME | string | Returns HH:MM:SS.fff |
| UNIQUEIDENTIFIER | string | GUID/UUID format string |
| VARBINARY(n) / IMAGE | Buffer | Binary data as Node.js Buffer |
| NULL column | field?: Type | — |
Everything you need to know about converting SQL Server to TypeScript Interfaces.
Paste your SQL Server CREATE TABLE statements into the SQL editor on the left. The TypeScript Interfaces output appears instantly on the right panel in real-time as you type.
Yes — completely. The entire conversion runs inside your browser using JavaScript. Your SQL is never sent to any server, logged, or stored anywhere. This makes it safe to use with production or confidential database schemas.
PostgreSQL, MySQL, SQLite, SQL Server, Oracle, and MariaDB DDL syntax are all supported. The parser auto-detects the dialect from your CREATE TABLE syntax automatically.
Yes! Paste multiple CREATE TABLE statements separated by semicolons and all tables will be converted simultaneously, including cross-table foreign key relationships.
Yes. NULL, NOT NULL, DEFAULT values, PRIMARY KEY, UNIQUE, and FOREIGN KEY constraints are all parsed and reflected in the TypeScript Interfaces output. Nullable columns are correctly typed as optional properties or nullable types.
Yes, SchemaForge is completely free with no usage limits, no account required, and no rate limits. The tool runs entirely in your browser and will always be free.