Dev tools · alternatives · 2026

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Proxyman – Modify HTTP Request/Response by JavaScript Code with Ease launched in 2020; newer entries below may have overtaken it.

1. 1
   Middleman▲136

   Intercept and modify and HTTP(S) request and response easily

   2024 · its alternatives →

2. 2
   Requestly 2.0▲112

   Intercept & modify HTTP requests

   2021 · requestly.com · its alternatives →

3. 3
   Requestly▲148

   Debug & Modify HTTP(s) Requests - loved by 125K+ web devs

   2019 · requestly.com · its alternatives →

4. 4
   Proxyman▲196

   An modern and intuitive HTTP debugging proxy

   2019 · proxyman.com · its alternatives →

5. 5
   RequestBin▲117

   Inspect HTTP requests in a human-friendly way

   2015 · pipedream.com · its alternatives →

6. 6
   SlothTools▲69

   Quickly modify text and JSON using Javascript + LoDash

   2022 · sloth.sellersew.com · its alternatives →

7. 7
   Proxy API for Web Scraping▲84

   Get HTML from any page with a simple API call

   2023 · its alternatives →

8. 8
   Fast.js – faster reimplementations of native JavaScript functions▲323

   Faster user-land reimplementations for several common builtin native JavaScript functions. - codemix/fast.js

   2014 · github.com · its alternatives →

9. 9
   Man in the Middle▲3

   Modify requests, inject JavaScript and CSS into pages

   2018 · github.com · its alternatives →

10. 10
    We’re open-sourcing Requestly - HTTP debugging proxy for Web and Mobile▲54

    Hey HN! We’ve open-sourced Requestly (https://github.com/requestly/requestly) - A network debugging proxy for web & mobile apps. Requestly intercepts all HTTP(s) requests & responses and provides full control to developers to modify the request/response like rewriting request URL to hit different environment or returning different response for APIs/scripts. In addition to HTTP(s) interception & modification capabilities, Requestly also offers Mock Server [0] & recording the browser sessions [1] with video, console logs, & network logs stitched together. We use…

    2023 · github.com · its alternatives →

11. 11
    httpbin(1)▲105

    HTTP request and response service

    2014 · httpbin.org · its alternatives →

12. 12
    QuickHeader▲3

    Modify HTTP headers. Right from your toolbar.

    Jul 2026 · chromewebstore.google.com · its alternatives →

13. 13
    Auto-generate vanilla JavaScript alternatives for jQuery methods▲137

    Automatically finds jQuery methods from existing projects and generates vanilla js alternatives. - sachinchoolur/jquery-to-javascript-converter

    2021 · github.com · its alternatives →

14. 14
    Sitemod.io Chrome Extension▲98

    Modify any website in real-time, save your mod and share it.

    2017 · sitemod.io · its alternatives →

15. 15
    HTTP Response API▲102

    Test how your code reacts to varying HTTP responses

    2023 · http.codes · its alternatives →

16. 16
    Tamper Chrome▲5

    Modify HTTP requests on the fly.(Not unofficially by Google)

    2017 · chromewebstore.google.com · its alternatives →

17. 17
    RequestBin.com▲127

    A new, improved request bin to inspect HTTP events

    2019 · pipedream.com · its alternatives →

18. 18
    HttpModifier▲3

    Modify HTTP Headers On-The-Fly

    2019 · httpdebugger.com · its alternatives →

19. 19
    Guardscript – Detect any changes made to your JavaScript files▲28

    Guardscript monitors every few minutes any changes made to your Javascript files and sends you a notification with the changes made. You can then detect any malicious modification by analyzing these results.

    2019 · guardscript.com · its alternatives →

20. 20
    Kyushu – A self-hostable WASM sandbox for JavaScript workers▲89

    A self-hostable Wasm sandbox for JavaScript workers.

    Jun 2026 · kyushu.dev · its alternatives →

21. 21
    ModResponse – Mock, modify, and replay HTTP response▲16

    2022 · chrome.google.com · its alternatives →

22. 22ST
    Scrape the web by injecting JavaScript into web pages▲109

    2014 · espion.io · its alternatives →

23. 23
    HTTPLang – a scripting language for making HTTP requests▲44

    A scripting langauge to do HTTP routines. . Contribute to f-prime/HTTPLang development by creating an account on GitHub.

    2015 · github.com · its alternatives →

24. 24
    chrome extension of modify http headers▲1

    chrome extension,modify http headers

    2023 · chromewebstore.google.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →