Format Interface and Type Alias
Input
interface User<T>{id:number;name:string;meta:T;}
type Response<T>=User<T>|null;Example output
interface User<T> {
id: number;
name: string;
meta: T;
}
type Response<T> = User<T> | null;
TypeScript Formatter
Code Formatters100% Client-SideReady
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About this tool, examples & FAQ
Format messy TypeScript interfaces, types, generics, and declarations into clean, readable code directly in your browser without sending code to remote servers.
Key facts
| Formatter Engine | Prettier TypeScript parser in an isolated Web Worker |
|---|---|
| Supported Operations | Format TypeScript (Interfaces, Generics, Enums, Types) |
| Privacy & Security | 100% Client-side execution; code is never uploaded |
| Maximum Input | 5 MB |
How to use
- Paste your TypeScript interface, type alias, or module into the input editor.
- Select your preferred indentation size, tab settings, and semicolon style.
- Click 'Format TypeScript' to beautify your type definitions and statements.
- Copy or download the formatted TypeScript code for your application.
Example
Edge cases
Complex Generic Constraints
Deeply nested conditional types (T extends U ? X : Y) and mapped types format cleanly with consistent indentation around operators.
Enums and Namespaces
Standard TypeScript enums, const enums, and module namespaces are formatted with proper member alignment.
Type-Only Imports and Exports
Modern TypeScript syntax like 'import type' and inline 'type' specifiers inside import blocks are preserved faithfully.
How it works
- Parses TypeScript AST using Prettier's TypeScript parser inside a dedicated Web Worker.
- Aligns type annotations, parameter types, union/intersection delimiters, and object type members.
- Validates syntax integrity and reports line/column coordinates for illegal syntax.
- Dispatches formatted TypeScript directly back to the editor pane.
Related workflows
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HTML Formatter
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Code Snapshot
Render pasted code as a styled SVG snapshot with syntax highlighting, themes, window frames, and gradient backgrounds for blogs and docs.
Frequently asked questions
Is my TypeScript code sent to a remote compiler?
No. All parsing and formatting happens locally in your browser using an isolated Web Worker.
Does this validate type correctness like tsc?
No. The formatter checks and enforces syntax and layout rules, but does not perform type checking or symbol resolution against external packages.
Can this format TSX files with JSX markup?
Yes. Modern TypeScript syntax including TSX tags and React component definitions are supported.
References
- TypeScript Official Handbook — Follows official Microsoft TypeScript syntax and language specifications