JSON to TypeScript Interface Generator

Generate TypeScript interfaces or types from a JSON sample

🔒 100 % in-browser🆓 Gratuit pour toujours⚡ Pas de signup
Note : L'interface de l'outil ci-dessous n'est actuellement disponible qu'en anglais. On traduit les UI une par une. Voir cet outil en anglais →

Comment ça marche

  1. 1
    Paste JSON

    Drop a sample response, config, or object literal.

  2. 2
    Name the root type

    Set the top-level type name (defaults to 'Root').

  3. 3
    Copy the TypeScript

    Get an interface (or type alias) definition for every nested object.

À propos de JSON to TypeScript Interface Generator

Free online JSON to TypeScript converter. Paste a JSON sample to generate clean TypeScript interfaces or type aliases, with automatic nested-type extraction and array union inference. Runs entirely in your browser. JSON to TypeScript Interface Generator sur 712 Tools tourne entièrement dans ton browser via des APIs JavaScript natives - aucun server ne voit jamais tes données. Résultats instantanés, privacy complète, et aucune limite d'upload.

Que ce soit pour une session de debug, un sanity check rapide ou un incident en prod, cet outil est gratuit à utiliser autant que tu veux. Pas de watermarks, pas de signup et pas d'ads dans l'outil.

Questions fréquentes

How are arrays typed?

Element types are inferred and merged: a mixed [1, 'a'] becomes Array<number | string>.

Interface vs type?

Interfaces are extensible via declaration merging; types are more flexible with unions and mapped types. Toggle in the UI to switch.

What about optional fields?

Only the fields present in your sample are emitted. Merge multiple samples with a union type if some fields are conditionally present.

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