Infer a JSON Schema
API · /jsontypes-api
JSON Types API
healthy
3,988 Subscribers
Infer a schema or types from a sample JSON document — the fastest way to get a contract out of an example API response. Pass a JSON sample and the schema endpoint returns a JSON Schema (Draft 2020-12) with detected types, required keys, array item schemas merged across elements, and recognised string formats (email, uri, uuid, date-time, date, ipv4); the typescript endpoint returns ready-to-paste TypeScript interfaces with named nested interfaces, typed arrays, unions for mixed-shape array elements and structural de-duplication. Supply the sample inline via ?json=, as a query parameter, or as a request body. Everything is computed locally with no network calls, so it is fast and deterministic. Built for scaffolding types from real API responses, generating validation schemas, documentation, contract testing and code generation. A JSON type/schema inferer — distinct from JSON-Schema validation (jsonschema), JSON pretty-printing and conversion (json), and JSON diff/patch (jsondiff). No upstream key, no cache.
api.oanor.com/jsontypes-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 74 ms
- Server probes · 24h
- Subscribers
- 3,988
- active
- Total calls
- 57
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 2,140 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 2,140 calls/month
- 2 req/sec
- Schema + TypeScript
- No credit card
Starter
€6.30 /month
- 41,500 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 41.5k calls/month
- 8 req/sec
- Formats + nested types
- Email support
Pro
€20.50 /month
- 218,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 218k calls/month
- 20 req/sec
- Codegen & contract pipelines
- Priority support
Mega
€53.40 /month
- 825,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 825k calls/month
- 50 req/sec
- Dev-platform scale
- Dedicated SLA
Built by
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api.oanor.com/schemamock-api
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api.oanor.com/proglang-api
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api.oanor.com/musicbrainz-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for JSON Types API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call JSON Types API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for JSON Types API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does JSON Types API cost?
JSON Types API has a free tier with 100 calls / month. Paid plans start at €6.30 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is JSON Types API GDPR-compliant?
All requests to JSON Types API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/jsontypes-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/jsontypes-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/jsontypes-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/jsontypes-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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