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Infer a TypeScript interface from a JavaScript object literal for quick model typing.
Input
0 chars
Output
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Status
Ready
Time
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This conversion runs on our server to use a Node-only library. Your input is processed for the request and never stored.
JS Object to TypeScript is a free online converter on AltFTool that infers a TypeScript interface from a JavaScript object literal for quick model typing — no signup and nothing to install.
The conversion runs on AltFTool's server: your input is sent to the AltFTool API, converted, and returned to your browser. It is not stored. JS Object to TypeScript is powered by the quicktype-core library, and the TypeScript result can be copied or downloaded as js-object-to-typescript.ts.
The input is JavaScript source — an object literal or module, pasted exactly as it appears in your editor.
| Input format | JS Object (JavaScript syntax) |
|---|---|
| Output format | TypeScript |
| Output file | js-object-to-typescript.ts (text/plain) |
| Runs | On AltFTool's server — the input is sent to our API and not stored. |
| Library | quicktype-core |
| Category | JavaScript converters on AltFTool |
Open JS Object to TypeScript on AltFTool — the converter loads straight away, with no account.
Paste your JS Object into the left-hand input pane, or press Sample to load a working example.
About 300ms after you stop typing, AltFTool posts your input to its conversion API and puts the TypeScript output in the right-hand pane.
If this converter exposes options, open Settings to change them — the output re-runs as you adjust.
Copy the TypeScript output with the Copy button, or download it as js-object-to-typescript.ts.
Yes — this one runs on the server, because quicktype-core is a Node library rather than a browser one. Your JS Object is sent to the AltFTool API, converted, and returned. It is not stored.
The quicktype-core library, running on AltFTool's server. The TypeScript you see is that library's output rather than an approximation written here.
Yes. Server-side converters accept up to 200,000 characters of input per request; anything larger is rejected with a "too large" error instead of being truncated.
The result is TypeScript. Copy it from the output pane in one click, or download it as js-object-to-typescript.ts — AltFTool names the file after the converter and serves it as text/plain.
Yes. JS Object to TypeScript is free to use on AltFTool, with no account and no sign-up.
Drop the live JS Object to TypeScript workspace into your own docs page, tutorial or blog post with one snippet. Free, responsive, light and dark — just keep the “Widget by AltFTool” credit link visible.
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<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/transform/js-object-to-typescript?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>More of AltFTool's JavaScript and format tooling, and the guides around it.