Validate App Manifest in Vega Studio

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App manifest validation catches configuration errors early in the development process by identifying missing required fields, incorrect data types, invalid URLs, and compatibility problems before deploying your React Native or native apps.

The Vega SDK v0.21 introduces built-in manifest validation through Vega Studio, a Visual Studio Code (VS Code) extension. With Vega Studio, you can get manifest validation in the editor during these development stages:

Development - Get immediate feedback as you edit your manifest.toml file
Code commits - Prevent validation errors in new changes
Build process - Catch issues before deployment
App submission - Confirm compliance with platform requirements

Important: This documentation may reference 'Kepler Studio' (former name of Vega Studio). All features and commands work the same.

Prerequisites

Install the Vega SDK .
A valid manifest.toml file in your project root.
(Optional) Install the TOML Language Support.

Note: Vega Studio's built-in validation works regardless if you have TOML language support installed. TOML language support provides syntax highlighting, ease of error spotting, and readability.

Verify validation

Vega Studio enables manifest validation by default. Validation starts automatically.

To verify it's working:

Open VS Code.
Select the Vega extension icon from the activity bar to open the Kepler Studio panel:
Open your project from the Projects section.

Validation fails to start automatically

If validation fails to start automatically, right-click on the manifest.toml and select "Validate Manifest".

VS Code context menu showing Validate Manifest option when right-clicking on manifest.toml file — Validate manifest

View validation results

To view validation results, check the Problems panel:

Mac: Cmd+Shift+M

Linux: Ctrl+Shift+M

VS Code Problems panel displaying manifest validation errors with file locations and error descriptions — Validation results

Example validation error

When the validation detects an issue, you see clear, actionable error messages like:

Error: Missing required property 'package.id'
Location: Line 3, manifest.toml
Fix: Add a unique identifier for your package, e.g., package.id = "com.example.myapp"

Last updated: Sep 30, 2025