--- description: Reference for the code interpreter extension on @cloudflare/sandbox@next. title: Interpreter image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/sandbox/llms.txt > Use this file to discover all available pages before exploring further. # Interpreter Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/api/interpreter/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/) Path to Sandbox SDK 1.0 This page documents `@cloudflare/sandbox/interpreter` on `@cloudflare/sandbox@next`. For the current stable package, refer to [Interpreter API](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/api/interpreter/). Methods live on `sandbox.interpreter` after you attach `withInterpreter` on your `Sandbox` subclass. Method names match the stable interpreter; `runCode` returns plain serializable data. Attach and first run: [Code interpreter](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/interpreter/). ## `createCodeContext()` ```ts createCodeContext(options?: CreateContextOptions): Promise ``` ### `CreateContextOptions` `createCodeContext` accepts the following options: | Field | Type | Description | | | -------- | ------------------------ | --------------------------------------- | -------------------------------------- | | language | "python" \| "javascript" | "typescript" | Interpreter language. Default: python. | | cwd | string | Working directory. Default: /workspace. | | ### `CodeContext` A created context has the following fields: | Field | Type | Description | | --------- | ------ | ----------------------------------- | | id | string | Context id in the current container | | language | string | Language of the context | | cwd | string | Working directory | | createdAt | Date | Created time | | lastUsed | Date | Last used time | ## `runCode()` ```ts runCode(code: string, options?: RunCodeOptions): Promise ``` ### `RunCodeOptions` `runCode` accepts the following options. The callback fields apply to `runCode` only. | Field | Type | Description | | | -------- | ------------------------------------------------ | ------------------------------------------------------------------- | ------------------------------------------------------------------- | | context | CodeContext | Context to use. If omitted, a default context for language is used. | | | language | "python" \| "javascript" | "typescript" | Used when creating or selecting a default context. Default: python. | | onStdout | (output: OutputMessage) => void \| Promise | Called for stdout chunks while running | | | onStderr | (output: OutputMessage) => void \| Promise | Called for stderr chunks while running | | | onResult | (result: ResultData) => void \| Promise | Called for rich results (plain data) | | | onError | (error: ExecutionError) => void \| Promise | Called when the run reports an execution error | | ### `OutputMessage` ```ts interface OutputMessage { text: string; timestamp: number; } ``` ### `ExecutionResult` ```ts interface ExecutionResult { code: string; logs: { stdout: string[]; stderr: string[]; }; error?: ExecutionError; executionCount?: number; results: ResultData[]; } ``` `ResultData` may include plain fields such as `text`, `html`, `png`, `jpeg`, `svg`, `latex`, `markdown`, `json`, and `chart` when the runtime produces them. ### `ExecutionError` ```ts interface ExecutionError { name: string; message: string; traceback: string[]; lineNumber?: number; } ``` ## `runCodeStream()` ```ts runCodeStream( code: string, options?: RunCodeOptions, ): Promise> ``` Returns an SSE byte stream of execution events. The TypeScript type reuses `RunCodeOptions` for `context` and `language`, but the stream path does **not** invoke `onStdout`, `onStderr`, `onResult`, or `onError` — consume the SSE body instead. Canceling the stream may interrupt the in-flight run. ## `listCodeContexts()` ```ts listCodeContexts(): Promise ``` ## `deleteCodeContext()` ```ts deleteCodeContext(contextId: string): Promise ``` ## Errors Interpreter failures may surface as `InterpreterNotReadyError`, `ContextNotFoundError`, or `CodeExecutionError`. Refer to [Errors API](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/api/errors/) and [Errors and recovery](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/errors/). Python requires the **`-python`** container image variant. Deploy the Worker package and container image from the same preview line. ## Related * [Code interpreter](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/interpreter/) * [Extensions](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/extensions/) * [Errors API](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/1-0-preview/api/errors/) * Stable: [Interpreter API](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/sandbox/api/interpreter/) Was this helpful? YesNo ## On this page [![](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/sandbox/1-0-preview/api/interpreter/#page","headline":"Interpreter · Cloudflare Sandbox SDK docs","description":"Reference for the code interpreter extension on @cloudflare/sandbox@next.","url":"https://developers.cloudflare.com/sandbox/1-0-preview/api/interpreter/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","dateModified":"2026-08-24","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} ```