17 lines
891 B
Markdown
17 lines
891 B
Markdown
---
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layout: default
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title: Generate Schema from Example Value
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parent: Examples
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nav_order: 9
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summary: >-
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Generating a schema for a serializable value.
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nav_exclude: true # schemars 0.8.2 currently unreleased
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---
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# Generate Schema from Example Value
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If you want a schema for a type that can't/doesn't implement `JsonSchema`, but does implement [`serde::Serialize`](https://docs.serde.rs/serde/trait.Serialize.html), then you can generate a JSON schema from a value of that type. However, this schema will generally be less precise than if the type implemented `JsonSchema` - particularly when it involves enums, since schemars will not make any assumptions about the structure of an enum based on a single variant.
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{% include example.md name="from_value" %}
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Note that the schema for the enum is not very useful in this case, since schemars doesn't know anything about the second variant.
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