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20 lines
1.4 KiB
Markdown
20 lines
1.4 KiB
Markdown
# Overview
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There are two places in n8n where you need to use code:
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* In [expressions](/code-examples/expressions/), for example programmatically setting the value of a field based on incoming data.
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* In the [function node](/integrations/builtin/core-nodes/n8n-nodes-base.function/), when you need to add JavaScript to your workflow.
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This section covers:
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* Built-in [methods and variables](/code-examples/methods-variables-reference/).
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* Expressions examples:
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* [Introduction to expressions in n8n](/code-examples/expressions/).
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* Supported libraries: [Luxon](/code-examples/expressions/luxon/) (for data and time) and [JMESPath](/code-examples/expressions/jmespath/) (for working with JSON).
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* JavaScript examples:
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* [Introduction to JavaScript in n8n](/code-examples/javascript-functions/).
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* Supported libraries: [Luxon](/code-examples/javascript-functions/luxon/) (for data and time) and [JMESPath](/code-examples/javascript-functions/jmespath/) (for working with JSON).
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* [Checking incoming data](/code-examples/javascript-functions/check-incoming-data/).
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* [Get the number of items returned by the last node](/code-examples/javascript-functions/number-items-last-node/).
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* Working with binary data: [Get the binary data buffer](/code-examples/javascript-functions/get-binary-data-buffer/) and [Split binary file data into individual items](/code-examples/javascript-functions/split-binary-file-data/).
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