Convert JSON to XML in TypeScript

JSON and XML have different data models, so there is no single universal conversion. Libraries make choices about roots, arrays, attributes, text nodes, nulls, and invalid XML element names; document those choices in APIs.

Quick Start#

The following example uses the standard TypeScript API or a widely used package for this task.

Using xmlbuilder2#

1// npm install xmlbuilder22import { create } from "xmlbuilder2";34const payload: Record<string, unknown> = {5  user: { name: "Ada", active: true },6};78const xml: string = create({ version: "1.0" })9  .ele(payload)10  .end({ prettyPrint: true });

Common Operations#

This second pattern covers a common production operation or a safer way to handle real input.

Create an explicit envelope#

1const xml = create({ version: "1.0" })2  .ele({ response: payload })3  .end({ prettyPrint: true });

Important Notes#

Validate object keys before turning them into XML element names if input can contain arbitrary user-controlled property names.

Best Practices#

1. Treat external input as untrusted and handle parse/validation errors explicitly.
2. Keep encoding, units, formats, and library-specific mapping rules explicit at system boundaries.
3. Add test vectors that cover empty input, Unicode text, malformed input, and representative production data.

References#

• RFC 8259: JSON
• W3C XML
• TypeScript Handbook