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Generate code types from JSON. Use for boilerplate; for TS only use json-to-typescript, for Go use json-to-go. Input: JSON ≤10MB. Returns code. 100% client-side, files never leave browser.
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Generates TypeScript interfaces, Go structs with json tags, Python dataclasses, Java classes, Rust structs, and C# classes from a single JSON sample. Infers nested objects, arrays, nullable fields, and emits code ready to paste.
Turning an API response into types by hand is tedious and error-prone. One sample can scaffold all target languages at once, locally without sending your payload to a server.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Full-stack developers scaffolding SDKs, mobile devs needing models from an endpoint, and anyone converting a webhook sample into typed code.
Paste JSON in the left pane, pick a language from the select, optionally set the root name.
The code updates live as you type, with nested types and array item types inferred from the first element.
Copy the code (data-testid) or download as a file. One sample is heuristic — validate with JSON Schema for production.
Input: {"user": {"name": "Ada", "age": 30}, "tags": ["dev"]} → TypeScript: interface User {name: string; age: number;} interface Root {user: User; tags: string[];}Input: same → Go: type User struct { Name string `json:"name"` ... }Is the JSON uploaded? No
generation is pure JS in your browser. Samples never leave your device.
Does it support nested arrays? Yes
it recurses and creates item types for arrays of objects.
Can I change the root name? Yes
edit the Root field before copying.
Authoritative specifications, standards, and in-depth reading for JSON to Code.
Traverses JSON sample to infer types. Handles nested objects, arrays, nulls, and primitive unions. No dependencies — pure TypeScript.
Generate TypeScript interfaces from JSON with optional readonly and export. Use for TS types; for Go use json-to-go, for generic code use json-to-code. Input: JSON ≤10MB. Returns .ts interfaces or JSON error. 100% client-side.
Generate Go structs with json tags from JSON. Use for Go only; for TypeScript use json-to-typescript. Input: JSON ≤10MB. Returns Go code or JSON error. 100% client-side.
Extract HTML tables to JSON arrays for scraping. Use for <table> input only; for CSV to JSON use csv-to-json. Input: HTML with tables ≤10MB. Returns JSON array or NO_TABLE_FOUND error. 100% client-side.
Convert between TOML, JSON, and YAML in any direction. Use for multi-format configs; for single-pair JSON-YAML use json-to-yaml. Input: TOML/JSON/YAML ≤10MB. Returns converted text or parse error. 100% client-side.
Shows Unicode code points, names and UTF-8 bytes for any text. Use when debugging encoding issues; differs from nato-alphabet by code points vs phonetic words. Returns per-character table with escapes. 100% client-side.
Spells numbers as English words with currency and ordinal options. Use for cheques, invoices or legal text; differs from text-to-unicode by words vs code points. Returns word form and copy-ready text. 100% client-side.
Spells text as NATO phonetic words (Alpha, Bravo, Charlie). Use when dictating over calls; differs from text-to-unicode by spoken words vs code points. Returns phonetic transcription. 100% client-side.
Convert Unix timestamps to readable dates and back. Supports timezones and multiple formats.