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18 lines
1.1 KiB
Markdown
18 lines
1.1 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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* Expressions:
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* [Introduction to expressions in n8n](/code-examples/expressions/).
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* Built in [methods](/code-examples/expressions/methods/) and [variables](/code-examples/expressions/variables/).
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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:
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* [Introduction to JavaScript in n8n](/code-examples/javascript-functions/).
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* Built in [methods](/code-examples/javascript-functions/methods/) and [variables](/code-examples/javascript-functions/variables/).
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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/). |