21 free tools
JSON Developer Tools
Generate types, schemas, database models, and framework-specific code from JSON examples for API and data workflows.
What this JSON collection covers
- Best for turning API payload samples into typed code or schema drafts.
- Supports many target languages and validation libraries.
- Helps document data structures during implementation and debugging.
Common workflows
- Generate TypeScript, Zod, Kotlin, or GraphQL drafts from JSON samples.
- Prepare database or analytics schema drafts from event payloads.
- Convert JSON into YAML, TOML, or other exchange formats.
JSON to React PropTypes
Generate React PropTypes from JSON sample. Free, no signup, runs in browser. By Folioify.
JSON to Flow
Generate Flow type definitions from JSON. Free, in-browser, no signup. By Folioify.
JSON to GraphQL
Convert JSON sample to GraphQL schema. Free, no signup, runs in browser. By Folioify.
JSON to TypeScript
Generate TypeScript types from JSON. Free, no signup, runs in browser. By Folioify.
JSON to MobX-State-Tree Model
Convert JSON to MobX-State-Tree (MST) model. Free, in-browser, no signup. By Folioify.
JSON to Sarcastic
Generate Sarcastic runtime types from JSON. Free, no signup, runs in browser. By Folioify.
JSON to io-ts
Generate io-ts codec types from JSON. Free, in-browser, no signup. By Folioify.
JSON to Rust Serde
Convert JSON to Rust Serde structs. Free REPL, no signup, runs in browser. By Folioify.
JSON to Mongoose Schema
Convert JSON to Mongoose schema for Node.js. Free, in-browser, no signup. By Folioify.
JSON to Big Query Schema
Generate BigQuery table schema from JSON. Free, in-browser, no signup. By Folioify.
JSON to MySQL
Convert JSON to MySQL CREATE TABLE schema. Free, no signup, runs in browser. By Folioify.
JSON to Scala Case Class
Generate Scala case class from JSON. Free, in-browser, no signup. By Folioify.
JSON to Go Struct
Generate Go structs from JSON online with nested fields and struct tags. Free browser-based JSON to Golang converter.
JSON to Go Bson
Generate Go BSON struct tags from JSON. Free, in-browser, no signup. By Folioify.
JSON to YAML
Convert JSON to YAML. Free, no signup, runs in browser. By Folioify.
JSON to JSDoc
Generate JSDoc type comments from JSON. Free, in-browser, no signup. By Folioify.
JSON to Kotlin
Generate Kotlin data class from JSON. Free, no signup, runs in browser. By Folioify.
JSON to Java
Generate Java class from JSON. Free, in-browser, no signup. By Folioify.
JSON to JSON Schema
Infer JSON Schema from JSON sample. Free, no signup, runs in browser. By Folioify.
JSON to TOML
Convert JSON to TOML config format. Free, in-browser, no signup. By Folioify.
JSON to Zod Schema
Generate Zod schema from JSON. Free, no signup, runs in browser. By Folioify.
Why use these JSON tools?
These tools focus on quick transformations and validation tasks that developers repeat during implementation, debugging, documentation, and migration work.
Are uploads required?
No. Tools run in the browser whenever possible, so code snippets stay on your device and can be copied out immediately.
JSON tools FAQ
Can one JSON sample describe every production field?
No. Use representative samples and review optional, nullable, and repeated fields manually.
Is generated code production-ready?
Generated output is a strong starting point, but it should be reviewed and tested in your project.