Free browser-based utilities for working with SQL, JSON, CSV, and data. Everything runs client-side, so your data never leaves your machine.
Whether you're formatting a query, validating JSON, converting between data formats, or generating test data, these tools are built for the way developers and analysts actually work every day. No accounts and no data uploads. Just open a tool and use it.
SQL
SQL formatter
Format and beautify SQL with dialect-aware indentation
SQL diff
Compare two SQL queries with a highlighted line-by-line diff
SQL validator
Check SQL for syntax errors before running it
SQL minifier
Compress SQL into a single line by stripping whitespace and comments
SQL schema visualizer
Generate ER diagrams from CREATE TABLE statements
Prisma schema visualizer
Generate ER diagrams from a Prisma schema file
Drizzle schema visualizer
Generate ER diagrams from Drizzle ORM table definitions
Supabase schema visualizer
Generate ER diagrams from Supabase PostgreSQL schemas
DBML schema visualizer
Generate ER diagrams from DBML database models
Mermaid ER diagram visualizer
Render Mermaid erDiagram code as an ER diagram
SQL explainer
Explain SELECT queries in plain English
SQL analyzer
Find risky SQL patterns before running a query
SQL query builder
Build SQL queries from tables, joins, and filters
Database schema diff
Compare two database schemas and see structural differences
JSON
JSON formatter
Format and beautify JSON with customizable indentation
JSON validator
Check JSON for syntax errors with detailed diagnostics
JSON flattener
Flatten nested JSON into table-ready keys
JSON diff
Compare two JSON documents with a highlighted diff
JSON to YAML converter
Convert JSON to YAML and back instantly
JSON schema validator
Validate JSON data against a JSON Schema definition
JSON Schema visualizer
Turn a JSON Schema or OpenAPI schema into a diagram
Developer
Regex tester
Test regular expressions with real-time match highlighting
Base64 encoder / decoder
Encode text to Base64 or decode Base64 to text
Cron expression builder
Build and decode cron expressions with a visual editor
GraphQL visualizer
Turn GraphQL schema SDL into a diagram of types and relationships
MCP tool schema validator
Validate MCP tool schemas and sample call arguments