Function●Since v1.1

context

A tagged template function for creating formatted strings.

This utility provides a clean, template literal-based API for string formatting that can be used for prompts, descriptions, and other text formatting needs.

It automatically handles whitespace normalization and indentation, making it ideal for multi-line strings in code.

When using this utility, it will:

Strip common leading indentation from all lines
Trim leading/trailing whitespace
Align multi-line interpolated values to match indentation
Support escape sequences: \\n (newline), \\`` (backtick), \$(dollar),{` (brace)

context(strings: TemplateStringsArray, values: unknown[]): string

Parameters

Name	Type	Description
`strings`*	`TemplateStringsArray`
`values`*	`unknown[]`

Example 1

import { context } from "@langchain/core/utils/context";

const role = "agent";
const prompt = context`
  You are an ${role}.
  Your task is to help users.
`;
// Returns: "You are an agent.\nYour task is to help users."

Example 2

// Multi-line interpolated values are aligned
const items = "- Item 1\n- Item 2\n- Item 3";
const message = context`
  Shopping list:
    ${items}
  End of list.
`;
// The items will be indented to match "    " (4 spaces)

View source on GitHub

context

Parameters

Example 1

Example 2

LangChain Assistant

Menu

context

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Example 1

Example 2

context

Used in Docs

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Example 1

Example 2

Menu

context

Used in Docs

Parameters

Example 1

Example 2