What is the difference between Parquet and JSON?

Parquet is a columnar binary storage format for analytics. It stores each column separately rather than each row, which makes selective reads fast and compression very effective. It carries a typed schema and underpins most data-lake tooling. JSON is a plain-text data format that stores nested objects and arrays. It is the standard payload format for web APIs, readable in any text editor, and parsed natively by every major programming language.

Will I lose anything converting Parquet to JSON?

Some things, yes. Parquet carries an explicit typed schema, and JSON has no way to represent types. The values themselves come across intact; the structure around them does not.

Anything to watch out for with JSON?

JSON has no comment syntax. Anything stripped from a JSONC or JSON5 source is gone. JSON numbers are IEEE 754 doubles — integers beyond 2^53 lose precision silently.

How is nested data handled?

JSON represents nesting directly, so the structure of your Parquet is preserved as-is.

What should I know about starting from Parquet?

Parquet is binary. You cannot inspect it in a text editor — you need a reader. More broadly: Parquet is a columnar binary format built for analytics. Instead of storing records row by row, it stores each column contiguously, which makes reading three columns out of two hundred dramatically faster and compresses far better because similar values sit next to each other.

When is JSON the right choice?

JSON suits: aPI request and response payloads; configuration files that need nesting; anything consumed directly by JavaScript. It is the wrong choice when very large tabular datasets, where the repeated keys dominate the file size.

Is there a file size limit?

No hard limit — the constraint is your browser's memory. Files under 50MB convert in a few seconds. Larger files work but take longer, and a browser tab typically has 250-500MB to play with, so very large batches are better split into smaller groups.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and the conversion runs on-device exactly as it does on desktop. Large files are slower on a phone because there is less CPU and memory available, but nothing about the workflow changes.

Convert Parquet to JSON

Read a Parquet file out to JSON so you can inspect or edit it without a query engine. Free, in your browser, no upload.

Drop data files to convert

JSON, YAML, XML, CSV, Parquet

Files stay on your device. Open DevTools' Network tab to verify.

Overview

Why convert Parquet to JSON

Parquet is a binary format — you cannot open it in a text editor or diff it in version control. Converting to JSON gives you something readable and greppable, at the cost of Parquet's type information and structure.

Comparison

Parquet vs JSON: what actually differs

Parquet compared with JSON across encoding, fidelity, file size and support.
Attribute	Parquet	JSON
Full name	Apache Parquet	JavaScript Object Notation
Encoding	Binary	Text — editor-readable
What it preserves	Typed schema preserved; nesting supported	Preserves nesting and value types exactly
Typical size	Much smaller than CSV or JSON for the same data — often by 5-10×	Verbose — keys repeat on every record
Support	Standard in Spark, DuckDB, Pandas, BigQuery, Snowflake and Athena.	Native in every programming language and every browser.

How to

How to convert Parquet to JSON

01
Drop your Parquet file
Drag one or more Parquet files onto the drop zone above, or click to browse. Files stay on your device — there is no upload step. data formats can't be reliably identified from their bytes alone, so the extension is used to work out the source format.
02
Convert to JSON
convert.now parses the Parquet and writes it out as JSON in a Web Worker, so the page stays responsive even on large files. Nothing is sent anywhere.
03
Download the result
Download the JSON file, or a zip of all of them for a batch. Filenames are preserved, with the extension changed to .json.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

Parquet to JSON: common questions

No. The Parquet to JSON conversion runs entirely in your browser. Files never leave your device, and there is no server involved in the conversion at all. Open DevTools' Network tab and run a conversion if you want to confirm it — you will see the page and its code load, and no request carrying your file.

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Last updated 27 August 2026

Why convert Parquet to JSON

Parquet vs JSON: what actually differs

How to convert Parquet to JSON

Drop your Parquet file

Convert to JSON

Download the result

Why convert.now

Parquet to JSON: common questions

Related Parquet converters