Error Handling

Common erroneous situations and we handle them:

A telefunction is called with wrong permissions, see Guides > Permissions.
The user entered invalid <form> values, see Guides > Form validation.
Our code has a bug, see Bugs.
The user's browser coulnd't connect to our server, see Network Errors.

To track errors: Guides > Error Tracking.

Telefunc automatically sets the right HTTP status code: we don't have to care about this.

Bugs

If a telefunction has a bug:

// hello.telefunc.js
// Environment: Node.js

export { hello }

function hello(name) {
  // This telefunction has a bug: it should be `name` instead of `namee`
  return 'Hello ' + namee;
}

Then the telefunction call throws an error:

<!-- index.html -->
<!-- Environment: Browser -->

<html>
  <body>
    <script type="module">
      import { hello } from './hello.telefunc.js'

      try {
        await hello('Eva')
        console.log("I'm never printed")
      } catch(err) {
        console.log(err.message) // Prints 'Server Error'
      }
    </script>
  </body>
</html>

This means we can treat bugs occuring in our telefunctions just like any other bug.

Just like with other bugs, we usually use our UI Framwork (React, Vue, ...) to handle bugs occuring during a telefunction call.

Network Errors

A telefunction call throws an error if it cannot connect to the server:

<!-- index.html -->
<!-- Environment: Browser -->

<html>
  <body>
    <script type="module">
      import { hello } from './hello.telefunc.js'

      try {
        await hello('Eva')
      } catch(err) {
        if (err.isConnectionError) {
          // There is a network problem:
          //  - the user isn't connected to the internet, or
          //  - our server is down.
          console.log(err.message) // Prints 'No Server Connection'
        }
      }
    </script>
  </body>
</html>

We usually use our UI Framework (React, Vue, ...) to gracefully handle network problems.

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