JSON → TypeScript
Generate TypeScript interfaces from a JSON object or array. The result updates as you type.
Input
Convert to
Output
Private by design
This conversion runs entirely in your browser. Your text is not sent to a server.
Tip
Format pretty-prints JSON. Minify strips whitespace. JSON → TypeScript builds interfaces from objects and arrays.
How to convert with JSON → TypeScript
Paste valid JSON in the input box.
The result updates as you type — nothing is uploaded.
Use Convert to to switch between Format, minify, and TypeScript with the same JSON.
Copy the result. Invalid JSON shows an error instead of output.
When should you use it?
Format
Pretty-print JSON with indent and optional key sorting.
Minify
Strip whitespace from valid JSON for smaller payloads.
Types
Turn a JSON sample into TypeScript interfaces.
Stays here
JSON never leaves this tab.
Your JSON stays private.
Formatting, minify, and TypeScript generation run entirely in your browser.
About live JSON convert tools
JSON Minifier and JSON → TypeScript share persist with JSON Formatter. Minify strips whitespace from valid JSON. TypeScript builds interfaces from objects and arrays. Invalid JSON shows an error instead of inventing output. Convert to jumps between the three with the same payload.
Worked example: pretty JSON minifies to one line for an API body; the same object can emit TypeScript interfaces for a client. Trailing commas are not JSON.
Use JSON Validator if you only need a yes/no plus a line number. JSON Compare for two documents. Nothing is uploaded.
Related JSON tools
JSON Formatter
Pretty-print JSON with indentation, optional key sorting, and minify. The result updates as you type.
JSON Minifier
Remove whitespace from valid JSON. Type or paste below — the result updates as you type.
JSON Validator
Validate and format your JSON. Check for syntax errors and view detailed error information. The result updates as you type — nothing is uploaded.
YAML ↔ JSON Converter
Convert YAML documents to JSON, or JSON values to YAML. The result updates as you type.
Fake JSON Generator
Generate sample JSON users, products, or API responses for mocks. The payload appears as soon as you pick a sample.
JSON → TypeScript examples
Interface
JSON tools
| Tool | Example | Typical use |
|---|---|---|
| Format | { "hello": "world" } | Pretty-print, reviews, and readable diffs |
| Minify | {"hello":"world"} | Compact payloads, logs, and copy-paste |
| TypeScript | export interface Root { … } | Interfaces for API samples and mocks |
JSON → TypeScript FAQ
Paste a JSON object or array into JSON → TypeScript. The TypeScript updates as you type. A root array generates an item interface and `export type Root = RootItem[]`. Nested objects become named interfaces you can copy into a project.
No. Inference runs in your browser. Use a representative sample, including nested arrays and objects that differ between items (those keys become optional). Export the result as a .ts file from the output pane when you are ready to copy it into a project.