JSON to TypeScript Converter

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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.

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About This Tool

Infer TypeScript declarations from a JSON sample, including nested objects and arrays.

How to Use

  1. Paste valid JSON.
  2. Set a root type name.
  3. Copy or download the generated TypeScript.

Tool Features

  • Nested interfaces
  • Array element unions
  • Optional keys from object samples
  • Invalid JSON feedback

Common Use Cases

Everyday work

Complete repetitive formatting or calculation tasks.

Publishing

Prepare clean output for websites and documents.

Local review

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

Local first

Supported processing runs inside your browser whenever practical.

Temporary files

When server processing is required, cleanup starts only after the work completes.

Your responsibility

Avoid uploading confidential data unless you understand the displayed processing notice.

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