JS: add mime_type to JavaScript PDF file content examples
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Add explicit mime_type: "application/pdf" to JavaScript PDF document input examples (URL and base64) in the messages documentation. This clarifies that mime_type is required when using type: "file" content blocks with url or base64 sources, since providers don't infer MIME type from these sources. Note: file ID examples don't need mime_type since providers already know the MIME type from when the file was uploaded. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Dec 26, 2025
mdrxy
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mime_type to JavaScript PDF file content examples
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mime_type to JavaScript PDF file content examplesmime_type to JavaScript PDF file content examples
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Summary
mime_type: "application/pdf"to JavaScript PDF document input examples in the messages documentationIssue
When using
type: "file"content blocks withsource_type: "url"for PDF files, providers like Google Vertex AI require an explicitmime_typefield. However, the current documentation examples don't include this field, which can lead to errors when users follow the examples.For example, without
mime_type, Vertex AI receivesapplication/octet-streamas the default MIME type, which it doesn't recognize as a valid PDF document.Changes
Updated JavaScript examples in
src/oss/langchain/messages.mdx:mime_type: "application/pdf"to URL source examplemime_type: "application/pdf"to base64 source example