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API · /querystring-api

Query String API

healthy 4,286 Subscribers

Parse and build URL query strings — with full support for nested objects and arrays. Turn a query string like a[b][c]=1&tags[]=x&tags[]=y into a clean nested JSON object, and turn any JSON object back into a properly-encoded query string. Choose how arrays are serialised (indices, brackets, repeated keys or comma-separated) and whether to URL-encode. Far beyond a flat key=value encoder — it handles the deep structures real web frameworks (Rails, PHP, Express/qs) use. Pure local processing — no key, no third-party service, instant. Live. 3 endpoints. Built for API request construction, parsing complex links and redirects, form-encoded bodies and webhook payloads.

#query-string #url #parser #encoding #developer-tools #utilities
api.oanor.com/querystring-api
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Machine-readable spec so AI agents can integrate this API.

/api/querystring-api/openapi.json
/api/querystring-api/llms.txt

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
92 ms
Server probes · 24h
Subscribers
4,286
active
Total calls
42
last 7 days
status Full status page → · 15 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,260 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,260 calls/month
  • 2 req/sec
  • Nested parse + stringify
  • No credit card
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Starter

€4.40 /month

  • 16,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 16k calls/month
  • 8 req/sec
  • Array-format options
  • Email support
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Pro

€24.00 /month

  • 158,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 158k calls/month
  • 20 req/sec
  • Request-building pipelines
  • Priority support
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Mega

€60.00 /month

  • 810,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 810k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Built by

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Related APIs

Other APIs with overlapping tags.

URI Template API

Expand URI Templates (RFC 6570) — the standard used by GitHub, OpenAPI/Swagger, HAL and many hypermedia APIs — to build URLs from a template and a set of variables. The expand endpoint takes a template such as /users/{user}{?page,per_page} and a JSON object of variables, and returns the finished URI with everything correctly percent-encoded. It implements all four levels of the spec: simple expansion {var}; reserved {+var} and fragment {#var} expansion; the label {.var}, path {/var}, path-style-parameter {;var}, query {?var} and query-continuation {&var} operators; multiple variables {x,y}; and the value modifiers — prefix {var:3} (first N characters) and explode {var*} (expand lists and maps element by element). Variables can be strings, lists or associative maps. The parse endpoint inspects a template and lists its expressions, operators and variable names. Everything is computed locally and deterministically, so it is instant and private. Ideal for REST and hypermedia clients, API SDKs and code generators, OpenAPI tooling, and link building. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This expands URI templates; for building or parsing query strings use a query-string API and for canonicalising URLs use a URL API.

api.oanor.com/uritemplate-api

URL Canonicalize API

Normalize URLs to a canonical form so you can deduplicate, compare and clean them. The canonicalize endpoint lower-cases the scheme and host, drops the default port (80 for http, 443 for https), resolves ./ and ../ path segments and fixes percent-encoding using the standard WHATWG URL parser, then applies the cleanups you choose: strip marketing and analytics tracking parameters (all utm_* plus gclid, fbclid, msclkid, yclid, mc_eid and many more), sort the remaining query parameters into a stable order, optionally drop the #fragment, and add or remove the trailing slash. It returns the canonical URL, the fully parsed components and the exact list of changes it made. The compare endpoint canonicalizes two URLs and tells you whether they point to the same resource — perfect for catching duplicate links that differ only by tracking codes, casing, port or parameter order. Everything is computed locally with no network calls, so it is instant, private and safe. Ideal for crawlers and SEO tooling, link deduplication and analytics, cache keys, bookmarking and content pipelines. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This canonicalizes the URL string; it does not fetch it or follow redirects — for link previews and unshortening use a URL-unfurl API.

api.oanor.com/urlcanon-api

URI Schemes API

The IANA Uniform Resource Identifier (URI) Schemes registry as an API — all 413 registered schemes (http, https, mailto, tel, ftp, ssh, magnet, bitcoin, geo, did, …). Look up any scheme to get its description, registration status (Permanent, Provisional or Historical) and defining reference; search by name or description; or list all schemes filtered by status. Ideal for URL parsers and validators, link handlers, deep-linking, security allow-lists and developer tooling that needs to recognise or vet URI schemes.

api.oanor.com/urischemes-api

Domain Parser API

Parse any hostname or URL with the Public Suffix List. Split a domain into its subdomain, registrable domain (eTLD+1) and public suffix (eTLD), or fetch just the suffix or just the registrable domain. Handles full URLs, internationalized (punycode) domains, IP addresses, multi-level suffixes like co.uk and com.au, and — when you ask for it — private suffixes such as github.io and s3 buckets. Built on an always-current Public Suffix List and served entirely in-memory, so responses are instant and the service is always available. Ideal for cookie and domain scoping, analytics attribution, email and link validation, security and anti-abuse, and devops tooling.

api.oanor.com/domain-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Query String API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Query String API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Query String 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 Query String API cost?
Query String API has a free tier with 100 calls / month. Paid plans start at €4.40 / 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 Query String API GDPR-compliant?
All requests to Query String 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/querystring-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/querystring-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/querystring-api/SOME_PATH");
curl_setopt($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/querystring-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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