OpenAPI Validator
Check a local Swagger 2.0, OpenAPI 3.0 or OpenAPI 3.1 document for schema errors and broken internal references. Read the reported paths without querying your API.
Open toolJSON to TypeScript interface Generator
Infer TypeScript interfaces from a JSON sample. Copy or download the nested definitions, then review optional fields and number precision against your actual API.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Generate interfaces.
Your result
Enter your details
Result will appear here
How JSON to TypeScript interface Generator works
Use quicktype to infer object structures, arrays and nullable types.
Processing uses bundled libraries in this browser. The download contains the generated source or document, rather than a link to a conversion service.
How to generate interfaces
Start with the supported input, then check the generated result.
Enter the source details
Use JSON sample, Root type name. The form starts with an example you can replace.
Input and settings
Tool result
Review and save the output
Review TypeScript interfaces inferred from a JSON sample. Download the generated file and check it in the application where you plan to use it.
Review the details
When to use JSON to TypeScript interface Generator
These workflows use the formats and behavior supported by this implementation.
Sketch response interfaces
Generate interfaces from a representative response before writing application code. Include an object array when several records show optional fields.
Review arrays and nested fields
Inspect inferred arrays, nested objects and nullable values. Sample inference cannot discover shapes that are absent from the input.
Compare types with an API contract
Compare the definitions with the API contract and compile them in your project. Large integers should be represented as strings when JavaScript cannot preserve them.
What the output contains
Keep the output format and conversion policy in view.
TypeScript interfaces inferred from a JSON sample. Use quicktype to infer object structures, arrays and nullable types.
Compare the result with the original before replacing a source file. Conversion limits are listed below.
Supported input and limits
Check these conditions before relying on the result.
The output is sample-derived source, not a verified API contract. Review optional fields and numeric precision. This page does not compile or execute TypeScript.
Input and results are not stored after leaving or reloading. Keep the original and download any output you need.
JSON to Java class Generator
Generate plain Java model classes from a JSON object or object array. Download a ZIP with separate class files, then review inferred types and add your serializer mapping.
Open tool
WOFF to TTF Converter
Convert a supported WOFF font to a TrueType container while keeping its table content. Use a font you have permission to convert and review the downloaded TTF.
Open toolMore free tools to try
Choose another tool for your next calculation, conversion, or text task.
CSV Viewer
Inspect quoted CSV cells in a readable table without uploading your data.
Open tool
CSV Validator
Check CSV quoting and consistent column counts, then review the record count and selected delimiter.
Open tool
JSON Diff Checker
Compare two JSON values by structure. See changed paths without treating object key order as a difference.
Open tool
JSON Schema Validator
Validate JSON against a draft-07 or 2020-12 schema. Review error paths without sending the documents to a server.
Open toolGenerate interfaces with your input
Generate the supported output, review it, and save a copy for your next step.
JSON to TypeScript interface Generator: common questions
Answers about using JSON to TypeScript interface Generator and understanding its results.
What does this tool produce?
It produces TypeScript interfaces inferred from a JSON sample. The output is sample-derived source, not a verified API contract. Review optional fields and numeric precision. This page does not compile or execute TypeScript.
Is my input uploaded?
Processing runs in this browser with local bundled libraries. No input is sent to a conversion server. Download your result before leaving the page.