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XML to Flow Converter

XML is a attribute-rich, namespace-aware hierarchical document format — widely used for SOAP APIs, RSS/Atom feeds, Android layouts, enterprise data exchange. Converting it to strongly-typed Flow structures eliminates runtime surprises and speeds up development. This tool does it in one click, entirely in your browser.

Generate Flow type annotations with exact object types and nullable field syntax for typed JavaScript.

How to use this converter

  1. Paste your XML into the left editor panel
  2. Click Generate
  3. Copy the generated Flow code from the right panel

No account. No upload. No tracking. Runs entirely in your browser.

Example Flow output

// @flow
 
type Address = {|
  city: string,
  zip: string,
|};
 
type User = {|
  id: number,
  name: string,
  email: ?string,
  address: Address,
|};

Why automate XML-to-Flow conversion?

Writing Flow type / interface definitions by hand from XML is:

  • Tedious — especially for deeply nested or large XML payloads
  • Inconsistent — naming conventions drift when done manually across a team
  • Fragile — when the XML schema changes, hand-written models lag behind

Flow uses structural typing with exact object types ({| |}) to catch unexpected property access at compile time.

This converter handles all of that automatically, giving you idiomatic Flow code that matches your XML structure exactly.

Flow and XML: what you need to know

Flow is a gradual static typing for JavaScript language, used in Meta/Facebook codebases and React Native projects. It uses type alias and object type based for structured data — making it a natural fit for XML-driven applications.

What the converter generates

Output produces Flow type declarations using exact object type syntax ({| ... |}), ?Type for nullable fields, and $ReadOnly wrappers for immutable models.

A common gotcha

Flow's ?Type (nullable) differs from TypeScript's Type | null | undefined — make sure your runtime handles both null and undefined.

XML input characteristics

XML allows mixed content (text + child elements), namespaces, and CDATA sections — more expressive but more verbose than JSON. XML is the foundation of many enterprise integration standards including XSLT, XSD, and SOAP.

When should I use this converter?

Use this when working in Flow-typed JavaScript codebases that consume external API data and need typed models without migrating to TypeScript.

Common use cases

  • Generating Flow types for legacy React codebases before TypeScript migration
  • Creating typed API response models for Flow-checked JavaScript services
  • Producing exact object types for Flow-annotated Redux state shapes
  • Rapid prototyping with real XML payloads
  • Keeping Flow structs in sync when XML schemas evolve
  • Onboarding new team members by auto-generating the data layer
  • Validating XML contract compatibility with Flow type definitions
  • Generating Flow models from React Native codebases API responses
  • Creating typed DTOs for Meta-ecosystem JavaScript

Frequently asked questions

Does this work for large XML payloads?

Yes. The converter is optimized for large and deeply nested XML structures, running entirely in the browser without page reloads or server round-trips.

Does this converter support eXtensible Markup Language namespaces and nested structures?

Yes. XML supports both element content and attributes — this converter handles both when generating typed models. The parser handles deeply nested structures and generates matching nested Flow type / interface definitions.

How are optional fields handled in the Flow output?

Fields that may be absent or null in your XML are marked as optional in the generated Flow code. Note: Flow's ?Type (nullable) differs from TypeScript's Type | null | undefined — make sure your runtime handles both null and undefined.

Can I use the output directly in a React Native codebases project?

Yes. The generated Flow code follows idiomatic patterns for React Native codebases — you can copy it directly into your project.

Related tools on LangStop

If you work frequently with XML and Flow, bookmark this page to skip the manual model-writing step entirely.