A first Raycast extension can be a small, focused tool—but the title alone does not establish what this number formatter accepts or how it changes a value. Raycast’s documented workflow provides a solid path for building and validating an extension; specific claims about parsing, rounding, separators, or output require the actual implementation.
What a Raycast extension is built with
Raycast describes its extension platform as an API built around React, Node.js, and TypeScript, with the Store as a way to share extensions. Its developer documentation is the reference point for the current APIs and workflow: Raycast API documentation.
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The current getting-started guide lists Raycast 1.26.0 or later, Node.js 22.14 or later, npm 7 or later, and familiarity with React and TypeScript. These are version floors stated by Raycast, not a promise that every later guide will keep the same requirements; check the live page before setting up a new project: Getting started with Raycast extensions.
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Use Raycast’s developer workflow to create or import an extension, then work against the project’s command entry point and current API. Raycast’s CLI documentation says, “The Raycast CLI allows you to build, develop, and lint your extension.” The CLI also supports migration. Raycast API CLI documentation
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Confirm the prerequisites in Raycast’s live getting-started guide and install a compatible Node.js and npm environment.
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Create or import the extension through Raycast’s documented developer workflow.
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From the extension project directory, run
npx ray developto develop it in Raycast. Development mode provides hot reload and detailed error feedback.The Tool Desk
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Development mode and a distribution build serve different purposes: hot reload helps during iteration, while the optimized build is the artifact to inspect before distribution. Consult the CLI guide for current command behavior and any changes.
What the number formatter must prove
Raycast’s platform documentation cannot establish the behavior of a particular formatter. Without the extension’s source code or firsthand notes, it is not possible to say whether it accepts pasted text, decimals, negative values, or multiple values; how it handles invalid input; whether it rounds; which grouping or decimal separators it uses; or whether it copies a result.
Those details matter because “format a number” can mean several different things. Before describing the tool as a working formatter, verify its actual behavior in the implementation and in Raycast:
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Which inputs are accepted, including whitespace, signs, decimal values, and malformed text.
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Whether precision is fixed, configurable, or preserved, and what rounding rule applies.
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Whether digit grouping is applied and which locale or separator conventions determine the result.
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What happens on invalid or empty input, and whether the user sees an error or an unchanged value.
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How the formatted value is presented and whether an action copies it or otherwise uses it.
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What to check before sharing or submitting
An extension manifest describes its name, title, description, icon, author, supported platforms, categories, and commands. Store readiness also involves a distribution build, metadata and asset checks, npm lockfile guidance, and a README when setup is non-trivial. Use Raycast’s documentation for the current manifest and submission requirements rather than relying on an old project template: Extension manifest and Prepare an extension for the Store.
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Confirm the manifest fields and API version match current guidance.
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Check that the icon, category, and other required assets and metadata are present.
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Include the package lockfile as instructed, and add a README if setup is not self-explanatory.
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Run the distribution build and inspect the built extension in Raycast.
Raycast says public extensions receive collaborative review and CI validation, including checks for manifest conformance, assets, author, and build or type errors. Those checks are part of the platform’s review process; they do not guarantee acceptance or establish that a particular extension has been reviewed. Raycast extension security
How public Store distribution works
To distribute an extension publicly, submit a pull request to Raycast’s extensions repository. The contribution is reviewed, and acceptance precedes publication; users can then find accepted extensions in Raycast’s in-app Store or on the web. This describes Raycast’s general publication route, not the release status of a specific number formatter. See Submit an extension and the Raycast extensions repository.
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