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JSON to TypeScript Converter
Infer TypeScript interfaces from a JSON sample without uploading data.
API & Web Data workspacePasted input stays in your browser. No remote URLs are fetched.
Privacy-focused processingBrowser processing is used wherever practical.
25-minute cleanup policyServer files, when required, are removed after completion—not during active work.
JSON, CSV, XML or YAML as applicableMaximum size and exact support are shown inside the tool.
About This Tool
Infer TypeScript declarations from a JSON sample, including nested objects and arrays.
How to Use
- Paste valid JSON.
- Set a root type name.
- Copy or download the generated TypeScript.
Tool Features
- Nested interfaces
- Array element unions
- Optional keys from object samples
- Invalid JSON feedback
Common Use Cases
Complete repetitive formatting or calculation tasks.
Prepare clean output for websites and documents.
Inspect and verify your result before downloading.
Supported Input and Output
JSON, CSV, XML or YAML as applicable
- Check the tool workspace for its exact file-size limit.
- Browser format support can vary by device and browser version.
- Always review the generated result before important use.
Frequently Asked Questions
Is the inferred type guaranteed to represent all API responses?
No. A sample only reveals values present in that sample; review generated types against your API contract.
Security and Privacy Information
Supported processing runs inside your browser whenever practical.
When server processing is required, cleanup starts only after the work completes.
Avoid uploading confidential data unless you understand the displayed processing notice.