Anything shipped to a browser, including environment variables inlined at build time, is readable by every visitor. Web frontends should hold only publishable keys and short-lived user or client tokens, and call private APIs through a server or edge proxy.
Designed to be public and revocable.
Any key that can read private data or spend money.
Send requests to your own edge endpoint, which injects secrets and enforces CORS.
Restrict script and connect sources to reduce the impact of XSS.
JavaScript cannot read HttpOnly cookies, which limits token theft through XSS.
Bundlers inline them into JavaScript, where DevTools and scrapers can read them.
Obfuscation delays nobody. The key still appears in network requests.
innerHTML with upstream content opens XSS that can steal sessions.
Point the frontend at a RealComposer edge URL with an rc_live_ client token and allowed origins configured, so upstream secrets stay in the vault.
Only for values that are meant to be public. Anything the build reads ends up in the bundle.
Calling Twilio directly from client-side JS exposes your Account SID and Auth Token, enabling malicious actors to drain your SMS credits with spam campaigns. RealComposer proxies Twilio calls at the edge, attaching Basic Auth headers server-side.
To solve call plaid api from flutter without exposing client secret, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
You should not store Salesforce credentials in JavaScript / HTML client code. Edge pipeline attaches Bearer tokens so static sites never embed secrets. RealComposer Secret Vault injects headers on Cloudflare Workers so only your edge URL is public.
You do not need to spin up an Express, FastAPI, or Docker microservice just to stitch REST APIs together. RealComposer fetches multiple upstream endpoints concurrently at the edge, injects private credentials, and combines the responses into a single JSON schema with sub-10ms response times.
To merge salesforce contacts with hubspot crm one api, use one RealComposer pipeline with parallel steps. Parallel fetch Salesforce Contact and HubSpot CRM contact into one JSON object. Your Frontend / Web app makes one request instead of several sequential upstream calls.
To solve call github api with private personal access token from client, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
Credential leakage is the unintended exposure of secrets such as API keys, tokens, and passwords. Common sources include JavaScript bundles, decompiled mobile apps, public Git repositories, browser network logs, and low-code platform configurations visible to users.
Content Security Policy (CSP)Content Security Policy (CSP) is an HTTP response header that tells browsers which sources of scripts, styles, images, and network connections a page is allowed to use. By blocking unapproved sources, CSP reduces the impact of cross-site scripting and data exfiltration.
CORS Preflight & Edge ProxyingCross-Origin Resource Sharing (CORS) is a browser security protocol that restricts web applications from making API requests to a different domain unless the server explicitly grants permission via HTTP headers. Edge proxies resolve CORS errors by terminating browser preflight OPTIONS requests directly at the edge.
Client Token (Scoped Bearer Auth)A Client Token is a scoped, revocable authentication credential designed for frontend web and mobile applications. It grants permission to invoke specific edge API pipelines while enforcing allowed-origin domains and rate limits, safely abstracting sensitive upstream API secrets.