Paste representative JSON
Include several array items when possible. The converter merges object shapes and marks fields missing from some items as optional.
Developer Tools
JSON to TypeScript & Schema Converter
100% browser-based. Your JSON never leaves your device.01
JSON input
Paste an object, array, or primitive JSON value.
JSON0 lines
02
Generated schema
Interfaces and type aliases
TypeScript0 lines
From payload to types
Generate safer application types
Use representative data, choose the validation strategy your project needs, and review inferred unions and optional fields before shipping.
Turn JSON payloads and API responses into clean TypeScript interfaces, Zod validators, or TypeBox schemas with nested types and inferred optional fields.
Choose an output
Use TypeScript for compile-time types, Zod for runtime parsing, or TypeBox when you need JSON Schema-compatible definitions.
Review and integrate
Rename the root type, enable project-specific options, then copy or download the generated TypeScript file.
Schema FAQ
JSON conversion questions
Does this tool upload my JSON?
No. Parsing and code generation happen locally in your browser, so API payloads and sample data are not sent to DevsLoad.
How are mixed arrays handled?
Compatible object items are merged and missing properties become optional. Different primitive types are represented as unions.
Does generated Zod code validate at runtime?
Yes. The generated Zod schemas can parse and validate unknown values after you install Zod in your project.
What happens with empty arrays?
Without sample items there is no element type to infer, so empty arrays use unknown until you replace it with the intended type.