SideFetch — REST API Tester Side Panel

Test APIs right beside your docs — no tab switching, no desktop apps. A fast, lightweight REST API tester in Chrome's Side Panel.

SideFetch is a REST API client that lives in Chrome's Side Panel. Test APIs right beside your documentation, Stack Overflow answers, or your own app — without switching tabs or opening heavy desktop tools like Postman. FEATURES: • Side Panel Testing — Opens in Chrome's Side Panel and stays open as you browse. Read API docs on the left, test endpoints on the right. • All HTTP Methods — GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. Send JSON, text, form data, or binary bodies. • 12 Authentication Types — Bearer Token, Basic Auth, API Key, OAuth 1.0, OAuth 2.0, JWT, Digest, Hawk, AWS Signature V4, NTLM, Akamai EdgeGrid, and more. No more manually constructing auth headers. • cURL Paste Detection — Copy a cURL command from any docs page, paste it into the URL bar, and SideFetch auto-fills the method, URL, headers, and body instantly. • AI Error Explanations — Got a 401? 500? CORS error? Click "Explain Error" and get a plain-English explanation with actionable fixes. No more Googling cryptic error messages. • Collapsible JSON Viewer — Expand and collapse nested JSON responses with syntax highlighting. Search within responses. Copy with one click. • Request History — Every request is automatically saved. Replay any past request with one click. • Collections — Organize frequently used endpoints into named collections for quick access. • Dark & Light Mode — Switch themes to match your preference. • Keyboard Shortcuts — Hit Cmd+Enter (or Ctrl+Enter) to send requests instantly. FREE PLAN (forever): - Unlimited requests with all HTTP methods - All 12 auth types - JSON tree viewer + cURL paste - 50 history items, 3 collections - 5 AI explanations per day PRO PLAN ($5.99/month): - Unlimited history, collections, and AI explanations - Import & export collections - Priority support Your data stays local. API requests go directly from your browser to the target server. History and collections are stored in Chrome's local storage — never sent to our servers. Questions or feedback? Email support@sidefetch.com