httpmon
httpmon is a free terminal proxy for inspecting and changing HTTP and HTTPS traffic on Linux and macOS.
What httpmon is
httpmon is a free terminal proxy for inspecting and changing HTTP and HTTPS traffic on Linux and macOS. Requests and responses appear in real time, with methods and status codes color-coded. For HTTPS inspection, it generates CA certificates and displays decrypted headers, bodies, and timing in plain text. It can decode gRPC, gRPC-Web, and Protobuf bodies into readable JSON, including wire-format fields when no .proto files are provided. Vim-style navigation and filters for host, path, method, and status code help narrow traffic. You can inspect, compose, or repeat requests, copy them as cURL, and compare them side by side. JavaScript hooks can modify traffic; throttling presets and local file serving provide additional controls. Captured flows can be exported in HAR format, and an MCP server can expose traffic to LLM agents. The FAQ says it runs over SSH, in Docker, and in CI wherever a terminal is available. The Free plan is free, MIT-licensed, and requires no account.
Good
- Real-time requests and responses are color-coded.
- Decodes gRPC and Protobuf bodies as readable JSON.
- Supports request editing, replay, and side-by-side comparison.
- Exports captured flows in HAR format.
- Free plan requires no account.
Watch out
- Supports Linux and macOS only.
- HTTPS inspection displays decrypted traffic in plain text.
Who it suits
httpmon suits developers who want terminal-based traffic inspection and editing on Linux or macOS. It may also fit workflows running over SSH, in Docker, or in CI.
Verdict
httpmon combines live traffic inspection with tools for editing, replaying, and exporting requests. Its terminal-based approach and Linux and macOS support are central considerations when choosing it.
Plans and prices
From httpmon's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | MIT license · no paid tiers · no account needed |
The facts
Each one read from httpmon's own pages, with the date it was checked.
What it does
- Export
- Captured flows can be exported in HAR format.checked 8 Oct 2026
- HTTPS interception
- httpmon automatically generates CA certificates to decrypt HTTPS traffic for inspection.checked 8 Oct 2026
- Live inspection
- Requests and responses appear in real time with methods and status codes color-coded.checked 8 Oct 2026
- MCP integration
- An MCP server can expose captured traffic to LLM agents via the Model Context Protocol.checked 8 Oct 2026
- Navigation and filtering
- It supports vim-style navigation and filtering by host, path, method, or status code.checked 8 Oct 2026
- Protocol decoding
- It decodes gRPC, gRPC-Web, and Protobuf bodies as readable JSON, including wire-format fields when no .proto files are provided.checked 8 Oct 2026
- Purpose
- httpmon is a terminal HTTP/HTTPS debugging proxy that intercepts traffic so users can inspect and modify requests and responses.checked 8 Oct 2026
- Request tools
- Users can inspect headers and bodies, compose or repeat requests, copy requests as cURL, and compare requests side by side.checked 8 Oct 2026
- Resource use
- The FAQ says it starts in milliseconds and uses about 20 MB of RAM.checked 8 Oct 2026
- Security detail
- The site says HTTPS traffic is decrypted and its headers, bodies, and timing are shown in plain text.checked 8 Oct 2026
- Traffic controls
- JavaScript hooks can modify requests and responses; httpmon also supports throttling presets and serving local files.checked 8 Oct 2026
- Where it runs
- The FAQ says httpmon works over SSH, in Docker containers, and in CI anywhere a terminal is available.checked 8 Oct 2026
Where it runs
- Supported platforms
- The FAQ specifies macOS for Apple Silicon and Intel, and Linux for arm64 and amd64.checked 8 Oct 2026
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