API · /jsondiff-api

JSON Diff & Patch API

degraded 4,983 Subscribers

Compare and patch JSON documents to RFC standards. Pass two documents and the service returns whether they are equal, an RFC 6902 JSON Patch (the precise add/remove/replace operations that turn the first into the second, using RFC 6901 JSON-Pointer paths), a change summary, and an RFC 7386 JSON Merge Patch. The patch endpoint goes the other way: apply an RFC 6902 patch (add, remove, replace, move, copy and test operations) or an RFC 7386 merge patch to a document and get the result. Documents can be sent inline or as a JSON body. Everything is computed locally with no network calls, so it is fast and deterministic. Built for configuration and state management, API change detection, audit trails and change logs, optimistic-concurrency checks and data-sync pipelines. A JSON diff/patch engine — distinct from text diffing (textdiff), JSONPath querying (jsonpath), JSON validation and pretty-printing (json) and JSON-Schema validation (jsonschema). No upstream key, no cache.

#json #json-patch #json-diff #rfc-6902 #developer-tools #data

api.oanor.com/jsondiff-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/jsondiff-api/openapi.json

/api/jsondiff-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

degraded

Uptime: 83.33%; Server probes · 24h
Avg latency: 85 ms; Server probes · 24h
Subscribers: 4,983; active
Total calls: 0; last 7 days

Full status page → · 6 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

2,260 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
2,260 calls/month
2 req/sec
Diff + patch + merge patch
No credit card

Starter

€6.60 /month

44,500 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
44.5k calls/month
8 req/sec
RFC 6902 + 7386 + 6901
Email support

Pro

€21.10 /month

230,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
230k calls/month
20 req/sec
Config & state pipelines
Priority support

Mega

€55.20 /month

855,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
855k calls/month
50 req/sec
Data-sync platform scale
Dedicated SLA

Built by

PremiumApi

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api.oanor.com/jsontypes-api

JSONPath API

Query and extract from JSON with JSONPath, server-side. Run any JSONPath expression — wildcards, recursive descent, array slices and filter expressions like [?(@.price>10)] — against a JSON document and get back the matched values, the normalized paths and JSON Pointers of every match, or just the first match. Filter expressions are evaluated in a safe sandbox with no access to globals, and inputs can be sent as a JSON POST body or a query parameter. Pure local compute with no third-party upstream, so responses are instant and the service is always available. Ideal for no-code and automation platforms, ETL and data pipelines, API integrations, testing and config extraction.

api.oanor.com/jsonpath-api

YAML API

Convert, validate and tidy YAML through a fast, fully-local API. Turn YAML into JSON (including multi-document streams) or JSON into clean YAML with optional key sorting and custom indentation, validate a document and get the exact line and column of any syntax error with a context snippet, or reformat and normalize existing YAML. Inputs can be sent as a raw text/plain body, a JSON field or a query parameter; outputs are tidy JSON. Pure server-side compute with no third-party upstream, so responses are instant and the service is always available. Ideal for DevOps and CI/CD, configuration and infrastructure-as-code tooling, no-code platforms, editors and data pipelines.

api.oanor.com/yaml-api

JSON Schema API

Validate JSON against JSON Schema, server-side. Check any data against a schema (Draft-07 or 2020-12) and get a clear pass/fail plus a detailed list of every error with its instance path, failing keyword and message; verify that a schema itself is well-formed; or infer a starter JSON Schema automatically from a sample document, complete with detected formats like email, URI and date. Built on the battle-tested Ajv engine with full format validation. Every endpoint accepts GET (JSON-encoded parameters) or a JSON POST body and runs entirely locally with no third-party upstream, so responses are instant and the service is always available. Ideal for API request/response validation, form and data-entry checks, ETL and data-quality pipelines, no-code platforms and contract testing.

api.oanor.com/jsonschema-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for JSON Diff & Patch API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call JSON Diff & Patch API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for JSON Diff & Patch 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 Diff & Patch API cost?

JSON Diff & Patch API has a free tier with 100 calls / month. Paid plans start at €6.60 / 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 Diff & Patch API GDPR-compliant?

All requests to JSON Diff & Patch 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.

JSON Diff & Patch 2

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/diff

Diff two JSON docs → patch

Playground

Parameters

Custom headers

Language: Client:

GET /v1/patch

Apply a patch to a document

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Supported standards

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/jsondiff-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/jsondiff-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/jsondiff-api/SOME_PATH");
curl_setopt($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/jsondiff-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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JSON Diff & Patch API

API health

Pricing

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Related APIs

JSON Types API

JSONPath API

YAML API

JSON Schema API

Frequently asked questions

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