JSON Schema Generator
JSON Schema Generator is a free online JSON Tools tool that infer a JSON Schema 2020-12 document from a sample, detecting dates, emails, URIs and UUIDs instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
How to use: JSON Schema Generator →
Description
Infer a JSON Schema 2020-12 document from a sample, detecting dates, emails, URIs and UUIDs.
- Because everything is computed client-side, JSON Schema Generator is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using JSON Schema Generator takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Examples
These ready-made examples show typical inputs and the exact output JSON Schema Generator produces for them.
{"id":42,"email":"ada@example.com","created":"2026-09-11","tags":["a","b"],"active":true}A sample instance; the generator infers types, required fields and string formats.
Use cases
Common situations where JSON Schema Generator helps:
- Infer a JSON Schema 2020-12 document from a sample, detecting dates, emails, URIs and UUIDs.
- Because everything is computed client-side, JSON Schema Generator is safe to use with sensitive data such as API keys, tokens or private logs.
FAQ
What is JSON Schema Generator?
JSON Schema Generator infer a JSON Schema 2020-12 document from a sample, detecting dates, emails, URIs and UUIDs. It runs entirely in your browser, so your data stays private.
Is JSON Schema Generator free to use?
Yes. JSON Schema Generator is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.