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@shrutikapoor08 shrutikapoor08 commented Nov 19, 2025

Wrapping API call in a createServerFn to ensure function runs only on the server

Summary by CodeRabbit

  • Documentation
    • Updated external API data fetching tutorial with revised implementation approach and enhanced documentation on credential handling practices
    • Improved documentation formatting and corrected project naming for consistency and clarity across tutorial materials

@github-actions github-actions bot added the documentation Everything documentation related label Nov 19, 2025
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coderabbitai bot commented Nov 19, 2025

Walkthrough

Documentation updates demonstrate using createServerFn() for server-only API operations in a TanStack React Start tutorial. The fetchPopularMovies function is wrapped with createServerFn() to handle secure credential management. A minor text formatting correction is also applied to another tutorial file.

Changes

Cohort / File(s) Change Summary
Server Function Tutorial
docs/start/framework/react/tutorial/fetching-external-api.md
Replace async fetchPopularMovies function with createServerFn() wrapper for server-only execution. Add import for createServerFn from @tanstack/react-start. Update documentation text with explanatory notes on secure credential handling and server-only execution behavior.
File Operations Tutorial
docs/start/framework/react/tutorial/reading-writing-file.md
Fix project name spacing from "DevJokesapp" to "DevJokes app" in descriptive text.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

  • Review focus: Verify the createServerFn() usage pattern matches current API and documentation standards
  • Cross-reference the pattern change against official React Start examples to ensure correctness

Possibly related PRs

  • Tutorial: Fetching data from an external API #5050: Directly related—both modify the same tutorial file and the fetchPopularMovies implementation; one introduces the original direct-fetch version while this PR replaces it with the createServerFn-wrapped variant.
  • fix: various fixes #5215: Related through createServerFn runtime surface—this PR adds usage of createServerFn in documentation examples, while the retrieved PR alters start-plugin runtime filtering affecting createServerFn.js handling.

Suggested reviewers

  • schiller-manuel
  • birkskyum

Poem

🐰 A function wrapped in server-side grace,
No secrets leak from this safe place,
The tutorial dance, now secure and bright,
With createServerFn, credentials take flight,
And DevJokes app (with spacing delight)
Hops into docs, pixel-perfect and right! 🌟

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately describes the main change: updating documentation for fetching external APIs, specifically demonstrating server-side function wrapping with createServerFn().
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
✨ Finishing touches
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Post copyable unit tests in a comment
  • Commit unit tests in branch skapoor-fetching-api

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3a97163 and 5fd09ee.

📒 Files selected for processing (2)
  • docs/start/framework/react/tutorial/fetching-external-api.md (3 hunks)
  • docs/start/framework/react/tutorial/reading-writing-file.md (1 hunks)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
  • GitHub Check: Preview
🔇 Additional comments (3)
docs/start/framework/react/tutorial/fetching-external-api.md (3)

161-166: Documentation quality: Excellent explanation of server function pattern.

The "What's happening here" section clearly explains the security benefits and execution model. This helps developers understand not just the pattern but the reasoning behind it, which is valuable documentation practice.


147-158: Error handling is well-designed.

The loader consistently returns the expected type structure regardless of success or failure, preventing downstream component issues. This is a solid pattern for ensuring UI robustness.


125-125: No issues identified — createServerFn() API usage is correct.

The code uses the documented and correct pattern for TanStack React Start. The createServerFn().handler(async ...) pattern matches the official TanStack Start server functions API, confirming that the server function wrapping is properly implemented for secure server-side execution of the API call.


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nx-cloud bot commented Nov 19, 2025

View your CI Pipeline Execution ↗ for commit 5fd09ee

Command Status Duration Result
nx run-many --target=build --exclude=examples/*... ✅ Succeeded 1m 24s View ↗
nx affected --targets=test:eslint,test:unit,tes... ✅ Succeeded <1s View ↗

☁️ Nx Cloud last updated this comment at 2025-11-19 07:56:13 UTC

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commit: 5fd09ee

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