Offline engine (processed locally)TYPESCRIPT v1.0.0 Spec

JSON to io-ts

v1.0.0

Build runtime type-checking with io-ts by converting your sample JSON into io-ts codec definitions. This online tool handles unions, partial objects, and arrays, enabling robust validation in TypeScript projects. Free, quick, and works right in your browser.

Live sync—ms

JSONInput (JSON)Invalid

lines: 1chars: 28Size: 28 BUTF-8

TYPESCRIPTOutput (TYPESCRIPT)

Auto-generated

Converted output will appear here

lines: 0chars: 0Size: 0 BUTF-8

Size change: -100.00%TOML compliant: v1.0.0

Tool guide

Accurate conversion

Input is processed by this tool’s dedicated converter.

Local processing

Your input is processed in your browser and is not uploaded.

Ready-to-use output

Copy the result or save it as a file.