Free, Private & Local-First

Private NDJSON SQL Playground: Fast Local Queries via DuckDB-Wasm

Professional NDJSON SQL console. Query JSONL data locally using the high-performance, browser-native DuckDB-Wasm engine.

Overview

This private NDJSON SQL playground allows you to run fast local queries directly in your browser. Using the built-in DuckDB-Wasm engine, you can filter, sort, and aggregate large NDJSON datasets without installing a database or uploading your files to the cloud. It's a secure, browser-based SQL console designed for big data analysis.

How It Works

Step 1

Load your NDJSON dataset into our private, no-install SQL playground.

Step 2

Write SQL queries to filter, sort, and group your data instantly.

Step 3

Run fast local queries with our secure DuckDB-Wasm engine.

Step 4

Analyze the data in your browser and then export the results for free.

Frequently Asked Questions

Is it safe to process sensitive NDJSON files online?

Yes. Your NDJSON data is processed entirely within your browser. No data is ever sent to a cloud server, making it impossible for your information to be stored, sold, or leaked. It's as secure as opening a file in a local desktop application.

Can I run SQL SELECT statements on my files?

Yes. This is a full SQL playground, not just a simple filter. You can write and execute complex SELECT statements on your local files using DuckDB SQL syntax.

What is the difference between JSON, JSONL, and NDJSON?

Standard JSON is a single large object, whereas JSONL and NDJSON store each record on a new line. They're more efficient for large datasets because they can be processed as a stream. Our local engine can load even big files without crashing your browser.

Why is this NDJSON tool faster than other online converters?

Traditional tools require you to upload your NDJSON file to a remote server, wait for processing, and then download the result. Tabularly uses DuckDB-Wasm to process data locally in your browser. This eliminates network latency and server wait times, resulting in instant processing for even large datasets.

Which web browsers are supported?

We support all modern browsers including Chrome, Firefox, Edge, and Safari. For processing exceptionally large files, we recommend Chromium-based browsers like Chrome or Edge due to their efficient memory management for WebAssembly applications.

Is this tool compliant with strict corporate security policies?

Yes. This tool is ideal for environments with strict data sovereignty requirements. Since no data leaves your machine, using this browser-based utility is functionally equivalent to using a local text editor or spreadsheet application, bypassing the risks of third-party cloud uploads.

Privacy Note: This tool is safe for sensitive data because your files never leave your computer.