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Inssman

inssman.com·Browser DevTools & extensions

Inssman is an open-source browser extension that allows developers to intercept, modify, and debug HTTP(S) requests and responses. It supports modifying headers, payloads, query parameters, blocking or redirecting requests, and injecting files, making it a valuable tool for web development and testing workflows.

Open SourceMIT
WebEmbeddable
I
Inssman preview
Visit inssman.com↗
⭐129
stars
🍴26
forks
✓8
features
📅2022
since

Overview

8 features

Inssman is a Browser DevTools & extensions product. Enabling developers to intercept, modify, and debug HTTP requests and responses directly in the browser. It is built as an open-source project for web developers. Inssman is open source under the MIT license. It runs on the web and embeddable surfaces.

Inssman first shipped in 2022. Development happens publicly on GitHub with 129 stars. Key capabilities include Intercept HTTP requests, modify headers, and block requests.

  • ✓Intercept HTTP requests
  • ✓Modify headers
  • ✓Block requests
  • ✓Redirect URLs
  • ✓Modify responses
  • ✓Inject files
  • ✓Unlimited rules
  • ✓Open source

Tags

http-interceptionrequest-modificationbrowser-extensionheader-loggingweb-debugging

Built with & integrations

Framework
nextjs
Hosting
vercel
Connectors
githubchrome
Runs on
BrowserEmbeddable

Trust & compliance

LicenseMIT
Verified signals
✓ HTTPS✓ Open Source✓ Free tier✓ GitHub · ★ 129

Recent events

Latest indexed changes and source events

  1. IndexedJun 26, 2:36 PM

    Listing verified by the PulseGate indexer

    Source: PulseGate indexerOpen ↗

Frequently asked questions about Inssman

What does Inssman do?
Enabling developers to intercept, modify, and debug HTTP requests and responses directly in the browser. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Inssman for?
Inssman is an open-source project built for web developers.
Is Inssman free?
Yes — Inssman is open source under the MIT license and free to use.
What platforms does Inssman run on?
Inssman runs on the web and embeddable surfaces.
Is Inssman still maintained?
PulseGate's liveness checks currently classify Inssman as active.
What are alternatives to Inssman?
Similar tools tracked by PulseGate include WebSniffer, IN - IWS Notify, and Inspeck.WebSnifferIN - IWS NotifyInspeck
When did Inssman launch?
Inssman first shipped in 2022.
Is Inssman open source?
Yes — Inssman is open source under the MIT license, developed on GitHub.

At a glance

Pricing
Open Source
Platforms
Web
Languages
English
Open source
Yes · ★ 129
License
MIT
First seen
Jul 5, 2022
Activity
🟢 Active
Status
🟢 Active
Built for
web developers
Model
Open source
Solves
Enabling developers to intercept, modify, and debug HTTP requests and responses directly in the browser.

Developer

Vvmgev
Team
↗ GitHub

Open source

View on GitHub →
⭐ Stars
129
🍴 Forks
26
Open issues
23
Last commit
1y ago
Commits 90d
0
Contributors
6
Authorship
Team
Default branch
master
Latest release
1.0.63 · 2y ago

Live coverage

Confidence
High · 96
Indexed
Jun 26, 2026
Lifecycle
Alive
Activity
Active
First seen
Jul 2022
Last seen
4w ago
Identity audit (9)
Entity ID
cmqv1dqxl02dre6te8ao2twmu
Slug
inssman-open-source-modify-http-request-inssman-com
Verification state
Indexed for public listing
Claim / listing state
Unclaimed · listed: yes
Index status
Included in index
Latest evidence snapshot
Jun 26, 2026
Timeline basis
Indexed-at chronology (no inferred launch/funding milestones).
Last updated
Jun 26, 2026
Canonical URL
https://inssman.com/

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