Flow to TypeScript (2026) ✨
Convert Flow to TypeScript. Free, no signup, runs in browser. By Folioify.
Flow to TypeScript Tool 🧰
Paste your input below and the output will update automatically.
This code is converted on the server.
TL;DR ⚡
Use Flow to TypeScript to speed up migration work by converting Flow-style annotations into TypeScript-like output for review.
Example Input
type User = {
id: string,
name?: string,
};Expected Output
type User = {
id: string;
name?: string;
};Core Information 📌
Pricing
Free — no registration required.
Data Handling
Client-side only — runs in your browser.
Output
Instant conversion with clean results.
Target Users
Developers, designers, and creators.
What is Flow to TypeScript? 🧭
Flow to TypeScript converts Flow type syntax into TypeScript syntax, helping teams move legacy annotations toward modern TS code.
What can it do? ✅
- Convert common Flow type aliases and annotations.
- Help identify migration issues before manual cleanup.
- Support incremental Flow-to-TS modernization workflows.
- Produce copyable TypeScript output for review.
How Flow to TypeScript works (Step-by-Step) 🪄
- Step 1: Paste Flow-annotated source or type definitions.
- Step 2: The converter rewrites supported Flow syntax into TypeScript.
- Step 3: Review edge cases and update the result for your project conventions.
Common Errors
- Flow-specific utility types may require manual TypeScript equivalents.
- Exact object type semantics can differ from TypeScript.
- Generated imports may need cleanup in a real project.
Limitations
- This is a migration helper, not a full project migration engine.
- Always run TypeScript checks after applying converted code.
- Runtime behavior is not analyzed.
Free vs Paid 💸
This tool is 100% free with no usage limits or account required. You can use it for quick conversions without subscriptions or payments.
Official vs Third-Party 🧪
Folioify provides this as a third-party utility. It does not replace official tools, but offers a fast, accessible alternative for everyday workflows.
Use Cases 💡
- Estimate migration effort for a Flow file.
- Convert simple shared types into TypeScript.
- Create a cleanup draft for code review.
Frequently Asked Questions ❓
Can it migrate an entire repository?
No. This page converts snippets and files. Repository migration still needs build, lint, and test work.
Are Flow exact object types preserved?
Some semantics differ between Flow and TypeScript, so exact object types need manual review.
Should I trust the output without checking?
No. Use it as a starting point and run TypeScript checks in your project.
Data Sources & Disclaimer 📎
This tool is provided for educational and productivity purposes. Output accuracy depends on input quality. It relies on well-known open-source libraries where applicable.
Last updated: July 4, 2026. This page is maintained regularly so tool details, examples, and FAQs stay current for developers and AI search systems.