Skip to content
freetier.wiki

CustomJS

CustomJS enables serverless JavaScript functions for dynamic web applications without backend infrastructure. · CustomJS · Compute

Overview

CustomJS offers a simple way to deploy serverless JavaScript functions, ideal for lightweight APIs, webhooks, and rapid prototyping without backend management.

Good fit

Use CustomJS when you need quick, serverless JavaScript APIs for web or mobile projects without managing backend servers.

  • prototyping
  • MVPs
  • student projects
  • small web apps

Not a fit

Avoid if you need more than 20 requests/day, or high concurrency beyond free tier limits.

  • enterprise workloads
  • custom domain needs
  • heavy compute
Quickstart · 5 steps
  1. Sign up at customjs.space and verify your email.
  2. Create a new project from the dashboard.
  3. Write your JavaScript function in the online editor.
  4. Deploy the function and copy the generated endpoint URL.
  5. Test your function using the provided endpoint.

Other free compute options

Cloudflare · Compute
100,000 requests/day · 10ms CPU time/request · Up to 100 Workers per account
Billing risk: None
No card
Vercel · Compute
1,000,000 Edge Requests/month included · 100 GB Fast Data Transfer/month included · 1 team seat on the Hobby plan
Billing risk: None
No card
1,000,000 Function Invocations/month included · 4 hours Fluid Active CPU/month included · 360 GB-hrs Fluid Provisioned Memory/month included
Billing risk: None
No card
Trigger.dev · Compute
$5 compute credits per month · 20 concurrent runs · Unlimited tasks
Billing risk: None
No card