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JSONSchema turns a sample JSON object into a strict JSON Schema (draft 2020-12), explains each required field, and screens it with deterministic rules.
JSONSchema turns a sample JSON object into a draft JSON Schema (2020-12), explains required fields, and lists Loose/Strict additionalProperties. Your paste is used for this run only and is not sold. This page does not host a live validator or publish OpenAPI.
Typical path: paste → draft → review. No fabricated user counts.
Pillar articles
- From sample JSON to a draft 2020-12 schema
A practical walkthrough: infer types, mark required fields, and avoid silent mock schemas.
- Plain-language validation rules that reviewers can use
How to explain type / required / format / enum checks so non-specialists can review before merge.
What does JSONSchema include at a glance?
- Sample JSON → JSON Schema draft (2020-12)
- Required fields inferred from sample keys
- Loose vs Strict additionalProperties
- Heuristic email/date-time formats from sample strings
- Deterministic compliance checklist
- Used for this run only — not sold
How do you use JSONSchema?
1. Paste sample JSON
Open the workspace and paste a representative payload (nested objects and arrays are fine).
2. Generate the draft schema
Run JSONSchema to get a draft 2020-12 schema plus plain-language field notes and deterministic rule hits.
3. Review before you ship
Tighten required/format/enum constraints. Treat the output as decision support, not legal sign-off.
What do people ask about JSONSchema?
What is JSONSchema?
A tool that turns a sample JSON object into a draft JSON Schema with required fields and Loose/Strict options.
What schema version does it use?
JSON Schema draft 2020-12.
Does it mark required fields?
Yes. Keys present in the sample object are listed as required.
Is my paste sold?
No. Your paste is used for this run only and is not sold as training data.
Who should use it?
API developers who want a first-pass contract from a sample object.
Does it host a validator?
No. It drafts a schema. You wire it into your own validator.
Which countries and regions can I use JSONSchema in?
As a cloud web app, JSONSchema is reachable from any country with internet access; there is no region lock by default. Payment availability via our merchant of record (Waffo Pancake) may vary by processor and region.
Is JSONSchema GDPR and privacy compliant?
Your inputs are used only to generate your output and are never sold. Retention, sub-processors, and your rights are described on our Privacy page; Enterprise plans can include a DPA and NDA on request.
What languages does JSONSchema support?
The interface and generated results are in English. You can paste input in other major languages wherever the underlying model understands them.