Parquet to JSON Converter
Handle Million Rows in Your Browser

Convert Apache Parquet files to JSON format instantly in your browser. DuckDB-WASM reads Parquet natively — Snappy, Gzip, and Zstd compression are automatically handled. No file upload, no server processing.

Drag & drop your file here, or browse

Accepts: .parquet (up to 50 MB)

Your data stays in your browser. By using this tool, you agree to our Terms and Privacy Policy.

How to Convert Parquet to JSON

Drag & drop your .parquet file or click "browse" to select it.

DuckDB-WASM reads the Parquet file natively, auto-detecting schema and decompressing data.

Preview the JSON output with properly formatted dates, timestamps, and numeric values.

Click the download button to save the JSON file.

Features

100% Browser-Based: Your data never leaves your device. Processed locally via WebAssembly — no server upload, no privacy concerns.
Native Parquet Reading: DuckDB-WASM reads Parquet files natively with full schema detection. Snappy, Gzip, and Zstd compression are automatically handled.
Type-Aware JSON Output: Dates, timestamps, BigInt values, and nested structures are properly formatted in the JSON output.

Parquet vs JSON: What's the Difference?

Apache Parquet is a columnar binary format optimized for analytics, with compression and strict typing. JSON (JavaScript Object Notation) is a lightweight text-based format widely used for APIs and application data exchange.

	Parquet	JSON
Storage	Columnar binary	Text (key-value pairs)
File size	3-10x smaller (compressed)	Larger (key names repeated)
Data types	Integer, Float, Date, Boolean (strict)	Strings, numbers, booleans, null
Readability	Requires specialized tools	Human-readable plain text
Common use	Data lakes, Spark, BigQuery, DuckDB	Web APIs, config files, NoSQL

Benefits of Converting Parquet to JSON

API integration — JSON is the standard format for REST APIs and web services
Developer friendly — JSON is natively supported by JavaScript, Python, and virtually every modern programming language
Human readable — unlike binary Parquet, JSON can be inspected and edited as plain text

Frequently Asked Questions

Is my data uploaded to a server?

No. Your file never leaves your browser. All processing happens locally using DuckDB-WASM. No data is sent to any server.

What Parquet compression formats are supported?

DuckDB-WASM natively supports Snappy, Gzip, Zstd, and uncompressed Parquet files. Decompression is handled automatically.

How are BigInt values handled?

BigInt values from Parquet BIGINT/HUGEINT columns are automatically converted to JavaScript numbers in the JSON output, preventing JSON.stringify errors.

What browsers are supported?

Any modern browser with WebAssembly support: Chrome, Firefox, Edge, Safari (14+).