FreeDataStore Tools¶

Browser-based data tools — profiling, cleaning, training, inference. Your data never leaves your machine.

Data Tools¶

Tool	Engine	Description
Data Profiler	DuckDB-WASM	Drop a file, get instant stats, distributions, data quality
Data Cleaner	DuckDB-WASM	Remove duplicates, fix nulls, trim, cast, rename
Schema Validator	DuckDB-WASM	Define rules, validate any dataset
Format Converter	DuckDB-WASM	CSV ↔ JSON ↔ Parquet ↔ SQL
Dataset Explorer	DuckDB-WASM	SQL-powered visual exploration

ML Training Tools¶

Tool	Engine	Description
Neural Net Trainer	TensorFlow.js	Build layers, train on CSV, see live loss chart, export model
Image Classifier	TensorFlow.js	Drag images into classes, train via MobileNet transfer learning
Auto-ML	Pyodide (sklearn)	Upload CSV, pick target — auto-trains 5 models, picks best
Clustering Explorer	Pyodide (sklearn)	KMeans, DBSCAN, Agglomerative — 2D scatter + metrics
Time Series Forecaster	TensorFlow.js	Train LSTM on time series, forecast the future
Model Playground	TF.js + ONNX	Load any model, test with live input, batch predict

Technology¶

All tools share the @freedatastore/sdk which wraps:

DuckDB-WASM — Full SQL engine running in the browser via WebAssembly
Apache Arrow — Columnar in-memory format for zero-copy data handling
WebWorkers — Heavy processing off the main thread

SDK API¶

import { loadFile, profile, clean, validate, exportTable, query } from '@freedatastore/sdk';

// Load any file into DuckDB
const { table, rows, columns } = await loadFile(file);

// Profile — stats, distributions, nulls, duplicates
const report = await profile(table);

// Clean — apply rules
const results = await clean(table, [
  { type: 'drop_duplicates' },
  { type: 'trim_whitespace' },
  { type: 'drop_nulls', columns: ['email'] },
]);

// Validate — check against schema
const validation = await validate(table, {
  columns: [
    { name: 'email', required: true, pattern: '^[^@]+@[^@]+$' },
    { name: 'age', min: 0, max: 150 },
  ],
});

// Export
const blob = await exportTable(table, 'parquet');

// Raw SQL
const rows = await query('SELECT * FROM data WHERE age > 30 ORDER BY name');

Contributing a tool¶

See the Contributing Guide for how to build and publish a new data tool.