JSONSchemaTurn sample JSON into a draft JSON Schema (2020-12)
Paste a sample JSON object. JSONSchema builds a draft JSON Schema (draft 2020-12), marks required fields from keys present, and applies Loose vs Strict additionalProperties. Used for this run only — not sold. Not a hosted validator or OpenAPI publisher.
No credit card required · Cancel anytime
Key takeaways
- Sample JSON → JSON Schema draft (2020-12)
- Required fields inferred from sample keys
- Loose vs Strict additionalProperties
JSONSchema — decision-support themes
Honest capability chips — not fabricated customer counts or uptime stats.
JSONSchema - definition
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.
What this is NOT
- Not a law firm, GRC platform, or certification body.
- Not a guarantee that outputs will satisfy every regulator or auditor.
- Not a substitute for qualified human review on high-stakes decisions.
Controller / Processor — When packs mention privacy roles, we use GDPR Art.4 labels (decision-support only).
Where teams get stuck without JSONSchema
Sample JSON → JSON Schema draft (2020-12)
Without reliable sample json → json schema draft (2020-12), work stays inconsistent and gaps show up after ship.
Required fields inferred from sample keys
Without reliable required fields inferred from sample keys, work stays inconsistent and gaps show up after ship.
Loose vs Strict additionalProperties
Without reliable loose vs strict additionalproperties, work stays inconsistent and gaps show up after ship.
Heuristic email/date-time formats from sample strings
Without reliable heuristic email/date-time formats from sample strings, work stays inconsistent and gaps show up after ship.
Describe. Review. Ship with JSONSchema
Turn sample JSON into a draft JSON Schema (2020-12)
Sample JSON → JSON Schema draft (2020-12)
Sample JSON → JSON Schema draft (2020-12) — deterministic and exportable. Decision-support, not a certificate.
Required fields inferred from sample keys
Required fields inferred from sample keys — deterministic and exportable. Decision-support, not a certificate.
Loose vs Strict additionalProperties
Loose vs Strict additionalProperties — deterministic and exportable. Decision-support, not a certificate.
Heuristic email/date-time formats from sample strings
Heuristic email/date-time formats from sample strings — deterministic and exportable. Decision-support, not a certificate.
Schemas your API can actually enforce
Sample JSON → JSON Schema draft (2020-12)
Use JSONSchema to sample json → json schema draft (2020-12).
Required fields inferred from sample keys
Use JSONSchema to required fields inferred from sample keys.
Loose vs Strict additionalProperties
Use JSONSchema to loose vs strict additionalproperties.
Heuristic email/date-time formats from sample strings
Use JSONSchema to heuristic email/date-time formats from sample strings.
From idea to result in 3 steps
Input
Describe your goal in plain language.
Process
JSONSchema structures the work and runs the workflow.
Ship
Copy, export, or upgrade for 40 runs/day · 300/mo.
Where teams use JSONSchema
Turn sample JSON into a draft JSON Schema (2020-12)
Sample JSON → JSON Schema draft (2020-12)
Use JSONSchema to sample json → json schema draft (2020-12).
Try it on this page
or generate a schema below.
Built for early adopters
Built for solo founders and small teams — early access, no public case studies yet. When we publish quotes, they will be consented and attributed; we do not invent names, logos, or outcome metrics.
Honest boundaries
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. Decision-support only — not a certificate, legal opinion, or conformity assessment.
Simple plans that scale
All paid plans include
- Sample JSON → JSON Schema draft (2020-12)
- Required fields inferred from sample keys
- Loose vs Strict additionalProperties
- Email support on paid plans — no hidden add-ons for core studio use
- 3 AI runs / day · 15 / month
- Studio demo (no extra LLM fee)
- 40 AI runs / day · 300 / month
- saved history · copy as Markdown/JSON text · fair-use cost guard
- Priority support · Yearly $190
- 200 AI runs / day · 3000 / month · BYOK
- Optional BYOK (your OpenAI key)
Feature comparison
What each plan includes — quotas reflect the enforced fair-use limits.
| Dimension | Free | Pro | Enterprise |
|---|---|---|---|
| Usage | |||
| AI runs | 3/day · 15/mo | 40/day · 300/mo | 200/day · 3,000/mo |
| Report export | Watermarked | Clean export | Clean export |
| Audit log | Not included | ✓ Included | ✓ Included |
| Product | |||
| Sample JSON → JSON Schema draft (2020-12) | ✓ Included | ✓ Included | ✓ Included |
| Required fields inferred from sample keys | ✓ Included | ✓ Included | ✓ Included |
| Loose vs Strict additionalProperties | ✓ Included | ✓ Included | ✓ Included |
| Heuristic email/date-time formats from sample strings | ✓ Included | ✓ Included | ✓ Included |
| BYOK (your LLM key) | Not included | Not included | ✓ |
| SSO | Not included | Not included | Roadmap |
| Support & compliance | |||
| Support | Community | Priority | Custom SLA |
Already paid? Unlock Pro with your license
Licenses are issued manually after your payment is confirmed: we generate one per paid order and send it to the purchase email, typically within a few hours. Enter it below to activate Pro on this device — no account needed. Nothing yet? Write to lixingliangsy@163.com and reference your order email.
Your questions, answered
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.
Quick answers
- Paste sample JSON.
- Get a draft Schema (2020-12).
- Required = keys present in the sample.
- Strict sets additionalProperties: false.
- Free is 3 AI runs / day and 15 / month.
How it compares
| Dimension | Manual | JSONSchema |
|---|---|---|
| Speed | You write types by hand | Draft from sample in one run |
| Required | Easy to miss keys | Inferred from sample keys |
| Strictness | Manual additionalProperties | Loose vs Strict toggle |
| Best for | Final hand-tuned contracts | First-pass schema draft |
When not to use: When you need a certified attested schema, a hosted validator, or OpenAPI publishing.
- plain language validation rules 2026 — From the JSONSchema blog.
- sample json to draft 2020 12 schema 2026 — From the JSONSchema blog.
- Fleet launch notes — JSONSchema ships in the LX AI Micro-SaaS fleet.
People also search
Click a tab to expand it; click again to hide. All content stays on the page for search engines.
Ship a schema you can enforce
Join developers using JSONSchema. Free to try — no card needed.
Trusted · Cancel anytime