
Requestly
modheader
Header Editor
Header Override
HeaderFlex.app
Live HTTP Headers
Modify Header Value (HTTP Headers)
An open-source ModHeader alternative trusted by 10,000+ developers. Edit and share headers with Profiles, URL filters, and a built-in tester.

Website, pricing, platforms and company facts side by side.
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FSM
Full Stack Marketer
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| Website | vibeheader.com | hackthejobhunt.com |
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A Powerful API Mocking and Testing Tool
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Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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Add custom HTTP request headers to any site. Set Authorization tokens, override Content-Type, inject debug headers per URL pattern. declarativeNetRequest. Free: 5 rules, Pro: unlimited.
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Open-source Chrome, Firefox, and Edge extension to modify HTTP request and response headers, cookies, and local profiles for API debugging.
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A local-first ModHeader alternative: rewrite HTTP request & response headers via Chrome's native declarativeNetRequest. No backend, no account, no telemetry.
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The goal of this project is to adds information about the HTTP headers in three ways:
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