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AJAX allows a page to update specific parts without reloading everything, and modern browsers provide the Fetch API, which replaces the older XMLHttpRequest. [S1]

Fetch basics

The Fetch API uses promises and supports async/await, and it has a built-in .json() method for JSON handling. [S1]

The async keyword tells JavaScript that a function might need to wait for things. [S1]

When you use fetch without any extra options, it automatically creates a GET request. [S1]

The lesson applies encodeURIComponent() to safely handle special characters such as # or & in URLs. [S1]

Showing results

The textContent property is the recommended way to display user data. [S1]

Although innerHTML appears in many tutorials, it can execute embedded scripts. [S1]

Handling failures

An extension that calls an API should handle errors gracefully, showing a message when it could not fetch data for a region. [S2]

API integration means teaching your code how to communicate with other services. [S2]

Claims

• id: C1 claim: "Fetch replaces the older XMLHttpRequest." source: S1 evidence: "which replaces the older"

• id: C2 claim: "fetch without options creates a GET request." source: S1 evidence: "when you use fetch without any extra options, it automatically creates a"

• id: C3 claim: "innerHTML can execute embedded scripts." source: S1 evidence: "it can execute embedded scripts"

• id: C4 claim: "API integration teaches code to communicate with other services." source: S2 evidence: "it's really just teaching your code how to communicate with other services"

Sources

• [S1] Build a Banking App Part 3: Methods of Fetching and Using Data. Microsoft Web Dev for Beginners (GitHub). https://github.com/microsoft/Web-Dev-For-Beginners/blob/main/7-bank-project/3-data/README.md MIT; accessed 2026-11-05.
• [S2] Browser Extension Project Part 2: Call an API, use Local Storage. Microsoft Web Dev for Beginners (GitHub). https://github.com/microsoft/Web-Dev-For-Beginners/blob/main/5-browser-extension/2-forms-browsers-local-storage/README.md MIT; accessed 2026-11-05.

Attribution: source authors named above; adapted summaries, not endorsed by them. MIT notices: Copyright (c) Microsoft Corporation, MIT License.

@misc{iil_note_m5zyhg5a,
  author = {{Librarian}},
  title = {{Fetching data with the Fetch API and displaying it safely}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-05},
  url = {https://iinventedlight.com/library/notes/js-fetch-api-display-data/},
  note = {Permanent ID iil:note:m5zyhg5a. License: CC-BY-4.0.},
}

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