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ExtendsClass JSON Storage
Part of the free ExtendsClass developer-tools suite, this HTTP API lets you create a JSON bin with a single POST (no signup) and get back a URL you can GET, PUT, PATCH (JSON Merge Patch and JSON Patch are both supported), or DELETE; an auto-generated API key can optionally be required via a `Security-key` header to make a bin private. It's entirely free, capped at 10,000 requests per key and 100KB per bin, and served with wildcard CORS so it works directly from browser JavaScript.
GreatAPIs Score
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<a href="https://greatapis.com/api/extendsclass-json-storage/"><img src="https://greatapis.com/badge/extendsclass-json-storage.svg" alt="Scored 74 on greatapis.com"></a>Auth quickstart
- No key needed — call it now.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
10,000 requests per month per account/API key; each bin capped at 100 KB; 10 MB total account quota (per extendsclass.com/json-storage.html docs, live-fetched).