HTTP interceptor
An open-source tool to intercept & modify network requests, headers, API requests, inject scripts & much more. A complete HTTP debugging software that works on your browser, simple & fast.
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Super charge your web development
Boost your web development with Requestly’s HTTP Interceptor. Debug, test, and optimize by managing and manipulating HTTP requests with ease.
Trusted by 200,000+ developers, from next-gen startups to Fortune 500 companies.
Why engineering teams choose Requestly
Complete Data Sovereignty
Choose local, team sync, or self-hosted. Your data never leaves your control.
Predictable, Flat Pricing
Free for up to 10 collaborators. Enterprise governance without hidden add-ons.
Lightweight & Developer-First
Open. Hit endpoint. Get response. No bloat, no lag, no noise.
Modify responses
Intercept, Modify & Mock API Responses in Real-Time
Query params
Add or Remove Query Parameters in any website URL.
Cross Device Testing
Test your website across multiple devices seamlessly
Modify headers
Modify HTTP request & response headers.
Replace string
Replace part of URL like hostname, query values.
Insert scripts
Inject Custom JS & CSS on any website(s).
Cancel Rule
Block URLs by specifying keywords or complete URL.
Redirect Rule
Redirect URL to a different page or site
Override Graphql
Modify or override GraphQL requests easily
Mock Server Open-source Mock Server to quickly create mock API endpoints for testing without creating an actual API. Edit Content-Type, Status Code, Headers, and Response body easily on the Mock Server. Mock collections Intercept, Modify & Mock API Responses in Real-Time Generate content using AI GPT-based API Response generator will help you . Host Files Upload any HTML/CSS/JS files and generate public links. Set HTTP Headers Set mock API’s HTTP Headers and Status Code API Client Quickly create mock API endpoints with the Requestly API Client for seamless testing—no need to build a real API. Effortlessly customize the Content-Type, Status Code, Headers, and Response Body to simulate various scenarios Import cURL requests Easily import cURL requests from any platform Test API responses Send API requests and test responses API request history View and analyze your API request history
Built for teams
Effortless team collaboration
Effortless team collaboration
Share instantly, sync effortlessly, and collaborate effectively with your team in dedicated workspaces.
- Quick One time sharing: Instantly generate a link for your assets, such as rules, mocks, and recordings, and share it with your team in one click.
- Team workspaces: Easily collaborate with teammates in a shared workspace. Group assets, such as mocks, rules, and sessions, in one place.
- Export data & sync to Git: Developers utilize session data directly in pull requests.
Enterprise-ready security and compliance
Requestly ensures top-tier security with SOC-II compliance, SSO integration, and role-based access control. We protect your data and secure your workflows, making us the ideal choice for enterprises.
SOC-II Compliance
Adheres to rigorous security standards for data protection and privacy.
Single Sign-On (SSO)
Simplifies user access with secure, centralized authentication.
Role-based access control
Ensures precise control over user permissions and data access.
Data encryption
Protects your data in transit and at rest with advanced encryption protocols.
Audit logs
Protects your data in transit and at rest with advanced encryption protocols.
Regular security updates
Keeps your environment secure with timely updates and patches.
Get started with Requestly
Intercept, modify and mock HTTP requests, build and test APIs, and host files. Free to use.
Free · macOS, Windows & Linux