JSONCrush

Judgement

What it is

Building block

What it does

A small JavaScript library that compresses JSON into short URL-safe strings so app state can be shared in a link.

Adopt it when

You want to store small app or game state in a URL without a backend.

Watch out

Compression is CPU-heavy for large inputs and output length still grows with the data.

Ready for

Usable

Runs as

Library

Built with

JavaScript

How established

Established: started 7 years ago, latest release v1.1.5.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: JSONCrush → V8 → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

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