How do I convert JSON to io-ts?
Paste your JSON sample into the editor on this page. The io-ts output updates live β copy it or download a .ts file.
JSON to io-ts
Generate io-ts codecs from JSON instantly. Build runtime-safe TypeScript validators for APIs, fp-ts projects and functional applications with browser-based.
Options
Input JSON
Paste or edit your JSON sample
io-ts output
Functional runtime decoders
Ready
import * as t from 'io-ts';
export const RootCodec = t.type({
id: t.number,
name: t.string,
email: t.string,
active: t.boolean,
score: t.number,
tags: t.array(t.string),
profile: t.type({
age: t.number,
city: t.string,
}),
});
export type Root = t.TypeOf<typeof RootCodec>;Why JSON to io-ts?
io-ts decoders validate unknown JSON at boundaries in functional TypeScript apps.
This page presets io-ts output so you can paste API JSON and ship typed code faster.
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FAQ
Is JSON to io-ts conversion free?
Yes. JSON to io-ts conversion on WebioTools is free for normal usage and runs in your browser.
Is my JSON data sent to a server?
No. Code generation happens locally in your browser. Your JSON never leaves your device.
Can I use this for API responses?
Absolutely. Paste REST or GraphQL JSON responses to scaffold io-ts definitions for your project.