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# Fuzzing with Fandango
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```{rubric} Fuzzing with Fandango
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Fandango produces myriads of _high-quality random inputs and interactions_ to test programs and protocols, giving users unprecedented control over format and shape of the inputs.
```{button-ref} Tutorial
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Get Started
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:::{grid-item-card} At a Glance
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Specify the format of your input data in a single file, combining [_grammars_](sec:first-spec) (for input syntax) and [_constraints_](sec:constraints) (for arbitrary input features).
Constraints come as _Python code_, so there are no limits to what you can specify.
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[About Fandango »](sec:about)
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:::{grid-item-card} Tutorial
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Produce valid inputs at high speeds, quickly covering the entire input space.
Test with [_extreme_ and _uncommon_ values](sec:strategies), uncovering bugs before your users do.
Tie in [Python data generators and fakers](sec:generators) to obtain realistic inputs.
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[Tutorial »](sec:tutorial)
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:::{grid-item-card} Reference
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Check program [outputs](sec:outputs) for correctness.
Test and mock clients and servers using [protocol testing](sec:protocols).
Create and check _binary_ strings, using [bit fields and bit sequences](sec:binary).
Use [regular expressions](sec:regexes) for quick and easy specifications.
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[Reference »](sec:reference)
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