Programming & Config Studio
JSON to Language Struct / Class Generator
RAW JSON OBJECT
GENERATED GO CODE
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Tool Documentation & Architecture
About SQL → JSON Schema
The SQL Schema to JSON Schema Converter transforms SQL `CREATE TABLE` DDL statements across PostgreSQL, MySQL, and SQLite into standard JSON Schema specifications with type mappings, min/max length constraints, and required fields.
Step-by-Step Guide
How to Use SQL → JSON Schema
1
Step 1
Paste your SQL `CREATE TABLE` script into the input area.
2
Step 2
Select JSON Schema Draft version.
3
Step 3
Review the generated JSON Schema document.
4
Step 4
Click "Copy JSON Schema".
Industry Scenarios
Practical Use Cases for SQL → JSON Schema
Automated REST API Schema Validation from SQL Migrations
Generate JSON Schema validation files for API routes directly from database table definition files.
Form Builder Validation Schema Generation
Extract `VARCHAR(100)` limits and `NOT NULL` rules from SQL tables to enforce maximum character lengths on frontend web forms.
Sample Data & Transformation
Input & Output Examples
Converting MySQL Table to JSON Schema
Input Sample:
`CREATE TABLE customers ( id INT PRIMARY KEY AUTO_INCREMENT, email VARCHAR(255) NOT NULL, balance DECIMAL(10,2) DEFAULT 0.00 );`
Processed Result:
`{\n "$schema": "https://json-schema.org/draft/2020-12/schema",\n "type": "object",\n "properties": {\n "id": { "type": "integer" },\n "email": { "type": "string", "maxLength": 255 },\n "balance": { "type": "number" }\n },\n "required": ["email"]\n}`Technical Capabilities
Key Features & Performance
- ✓Extracts `maxLength` constraints from `VARCHAR(N)` and `CHAR(N)` column definitions.
- ✓Translates `NOT NULL` constraints without default values into the JSON Schema `"required"` array.
- ✓Supports PostgreSQL, MySQL, SQLite, and Microsoft SQL Server.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy JSON Schema.
Technical Glossary
Key Terminology & Definitions
Column Constraints (SQL)
Rules enforced on table columns such as `PRIMARY KEY`, `NOT NULL`, `UNIQUE`, `CHECK`, and `DEFAULT`.
`maxLength` Keyword (JSON Schema)
A string validation constraint that limits the maximum character length of a valid string value.
Frequently Asked Questions (PAA)
SQL → JSON Schema FAQs
SQL `ENUM('a', 'b')` columns are converted into JSON Schema `"enum": ["a", "b"]` validation arrays.
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