How do I map JSON to Kotlin data classes?

100% Client-Side • Privacy Guaranteed • No Uploads

Online JSON to Kotlin Converter

Convert JSON structures into Kotlin data classes with null-safety and serialization annotations for Android and KMP.

Fast, secure, browser-native JSON processing in 3 simple steps

Paste your raw data directly into the editor or upload any .json, .jsonc, or .json5 file.

Instantly view syntax errors, health score, duplicate keys, and potential sensitive credentials.

One-click format, run structural comparisons, generate redacted copies, or download the clean output.

Generate clean Kotlin data classes from API responses for Android, Ktor, and Spring Boot applications.

Everything you need to know about JSON validation, formatting, and privacy

Inspect your JSON in JSONForge to generate strongly-typed Kotlin data classes compatible with kotlinx.serialization and Moshi.

Interactive hierarchical tree and table viewer.

Beautify and indent messy JSON data.

Find and fix syntax errors with line/column markers.

0–100 quality score and anomaly detection.

Compare two JSON documents structurally.

Compress whitespace for production payloads.