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56 lines
2.4 KiB
Markdown
56 lines
2.4 KiB
Markdown
# @validatem/is-string
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*This validator is designed to be used with [Validatem](https://validatem.cryto.net/), the universal and composable validation library.*
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Validates that a given input is a string.
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Note that it __does not__ validate that the string is non-empty (ie. has a length above 0); for that, you should use [@validatem/is-non-empty-string](https://www.npmjs.com/package/@validatem/is-non-empty-string) instead.
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## License, donations, and other boilerplate
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Licensed under either the [WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), at your choice. In practice, that means it's more or less public domain, and you can do whatever you want with it. Giving credit is *not* required, but still very much appreciated! I'd love to [hear from you](mailto:admin@cryto.net) if this module was useful to you.
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Creating and maintaining open-source modules is a lot of work. A donation is also not required, but much appreciated! You can donate [here](http://cryto.net/~joepie91/donate.html).
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## Example
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A runnable version of this example is included in the repository, as `example.js`.
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```js
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"use strict";
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const { validateValue } = require("@validatem/core");
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const isString = require("@validatem/is-string");
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console.log(validateValue("hello world", [ isString ])); // hello world
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console.log(validateValue(42, [ isString ])); /*
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AggregrateValidationError: One or more validation errors occurred:
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- At (root): Must be a string
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*/
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```
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## API
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__If you are new to Validatem,__ please read the documentation on the [Validatem website](https://validatem.cryto.net/) first - it will explain how the general API works, and how you should use validator modules with it.
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### isString
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Not callable. Validates that the input is a string. When validation passes, it returns the original string as-is.
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Possible error codes:
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- __validatem.is-string:__ The input was not a string.
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## Changelog
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### 2.0.0 (July 14, 2024)
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__BREAKING:__ Replace internal string checking implementation with a faster one; the new implementation will not recognize String objects from another realm (but will still work fine with regular, non-object strings).
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You most likely don't need to change anything about your code, but this is still considered a breaking change because it slightly changes the behaviour of the validator.
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### 1.0.0 (August 8, 2020)
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Initial release.
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