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API Development & Testing
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Using JavaScript
Open Source API Development & Testing Tools using JavaScript
A curated collection of the best open source tools and services for developing Application Programming Interfaces. using JavaScript.
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Scalar
Open-source API documentation and testing platform
Stars
16,043
Last commit
15 hours ago
License
MIT
Scalar is an open-source tool for building, customizing, and hosting interactive API documentation with OpenAPI support.
Open Source
Alternative to:
Postman
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Capture
– Capture screenshots, generate PDFs, scrape content, extract metadata, and automate browsers with one API.
Learn More
Popular Proprietary Software:
Claude Code Alternatives
14
Spotify Alternatives
2
Notion Alternatives
20
Lovable Alternatives
3
Wispr Flow Alternatives
7
CapCut Alternatives
5
Discord Alternatives
11
n8n Alternatives
5
Cursor Alternatives
9
Codex Alternatives
18
Adobe Photoshop Alternatives
3
Microsoft Word Alternatives
5
Popular Categories:
Low-Code/No-Code Platforms
37
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25
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21
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20
Web Analytics
16
PaaS & Deployment Tools
17
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Note-Taking Tools
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Cloud File Sync & Share Tools
14
Personal Knowledge Management (PKM) Tools
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Customer Communication Platforms
15
Collaborative Workspaces
15
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ScreenshotOne
The best screenshot API for developers. Automate website screenshots in one simple API call.
Start rendering for free
Capture – Capture screenshots, generate PDFs, scrape content, extract metadata, and automate browsers with one API.
ScreenshotOne
