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+label: File System
+collapsible: true
+collapsed: true
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+---
+title: API reference
+id: api-reference
+description: Wing standard library API reference for the fs module
+keywords: [Wing sdk, sdk, Wing API Reference]
+hide_title: true
+sidebar_position: 100
+---
+
+
+
+# API Reference
+
+
+## Classes
+
+### Fs
+
+The fs class is used for interacting with the file system.
+
+All file paths must be POSIX file paths (/ instead of \),
+and will be normalized to the target platform if running on Windows.
+
+#### Initializers
+
+```wing
+bring fs;
+
+new fs.Util();
+```
+
+| **Name** | **Type** | **Description** |
+| --- | --- | --- |
+
+---
+
+
+#### Static Functions
+
+| **Name** | **Description** |
+| --- | --- |
+| basename | Retrieve the final segment of a given file path. |
+| dirname | Retrieve the name of the directory from a given file path. |
+| exists | Check if the path exists. |
+| join | Join all arguments together and normalize the resulting path. |
+| mkdir | Create a directory. |
+| mkdtemp | Create a temporary directory. |
+| readdir | Read the contents of the directory. |
+| readFile | Read the entire contents of a file. |
+| readJson | Read the contents of the file and convert it to JSON. |
+| readYaml | Convert all YAML objects from a single file into JSON objects. |
+| relative | Solve the relative path from {from} to {to} based on the current working directory. |
+| remove | Remove files and directories (modeled on the standard POSIX `rm`utility). |
+| resolve | The right-most parameter is considered {to}. Other parameters are considered an array of {from}. |
+| tryReaddir | If the path exists, read the contents of the directory; |
+| tryReadFile | If the file exists and can be read successfully, read the entire contents; |
+| tryReadJson | Retrieve the contents of the file and convert it to JSON if the file exists and can be parsed successfully, otherwise, return `undefined`. |
+| tryReadYaml | Convert all YAML objects from a single file into JSON objects if the file exists and can be parsed successfully, `undefined` otherwise. |
+| writeFile | Writes data to a file, replacing the file if it already exists. |
+| writeJson | Writes JSON to a file, replacing the file if it already exists. |
+| writeYaml | Writes multiple YAML objects to a file, replacing the file if it already exists. |
+
+---
+
+##### `basename`
+
+```wing
+bring fs;
+
+fs.basename(p: str);
+```
+
+Retrieve the final segment of a given file path.
+
+###### `p`Required
+
+- *Type:* str
+
+The path to evaluate.
+
+---
+
+##### `dirname`
+
+```wing
+bring fs;
+
+fs.dirname(p: str);
+```
+
+Retrieve the name of the directory from a given file path.
+
+###### `p`Required
+
+- *Type:* str
+
+The path to evaluate.
+
+---
+
+##### `exists`
+
+```wing
+bring fs;
+
+fs.exists(p: str);
+```
+
+Check if the path exists.
+
+###### `p`Required
+
+- *Type:* str
+
+The path to evaluate.
+
+---
+
+##### `join`
+
+```wing
+bring fs;
+
+fs.join(...paths: Array);
+```
+
+Join all arguments together and normalize the resulting path.
+
+###### `paths`Required
+
+- *Type:* str
+
+The array of path need to join.
+
+---
+
+##### `mkdir`
+
+```wing
+bring fs;
+
+fs.mkdir(dirpath: str, opts?: MkdirOptions);
+```
+
+Create a directory.
+
+###### `dirpath`Required
+
+- *Type:* str
+
+The path to the directory you want to create.
+
+---
+
+###### `opts`Optional
+
+- *Type:* MkdirOptions
+
+---
+
+##### `mkdtemp`
+
+```wing
+bring fs;
+
+fs.mkdtemp(prefix?: str);
+```
+
+Create a temporary directory.
+
+Generates six random characters to be appended behind a required prefix to create a unique temporary directory.
+
+###### `prefix`Optional
+
+- *Type:* str
+
+The prefix for the directory to be created, default `wingtemp`.
+
+---
+
+##### `readdir`
+
+```wing
+bring fs;
+
+fs.readdir(dirpath: str);
+```
+
+Read the contents of the directory.
+
+###### `dirpath`Required
+
+- *Type:* str
+
+The path to evaluate.
+
+---
+
+##### `readFile`
+
+```wing
+bring fs;
+
+fs.readFile(filepath: str, options?: ReadFileOptions);
+```
+
+Read the entire contents of a file.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The path of the file to be read.
+
+---
+
+###### `options`Optional
+
+- *Type:* ReadFileOptions
+
+The `encoding` can be set to specify the character encoding.
+
+And the `flag` can be set to specify the attributes.
+If a flag is not provided, it defaults to `'r'`.
+
+---
+
+##### `readJson`
+
+```wing
+bring fs;
+
+fs.readJson(filepath: str);
+```
+
+Read the contents of the file and convert it to JSON.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path of the JSON file.
+
+---
+
+##### `readYaml`
+
+```wing
+bring fs;
+
+fs.readYaml(filepath: str);
+```
+
+Convert all YAML objects from a single file into JSON objects.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path of the YAML file.
+
+---
+
+##### `relative`
+
+```wing
+bring fs;
+
+fs.relative(from: str, to: str);
+```
+
+Solve the relative path from {from} to {to} based on the current working directory.
+
+At times we have two absolute paths, and we need to derive the relative path from one to the other.
+
+###### `from`Required
+
+- *Type:* str
+
+---
+
+###### `to`Required
+
+- *Type:* str
+
+---
+
+##### `remove`
+
+```wing
+bring fs;
+
+fs.remove(p: str, opts?: RemoveOptions);
+```
+
+Remove files and directories (modeled on the standard POSIX `rm`utility).
+
+Returns `undefined`.
+
+###### `p`Required
+
+- *Type:* str
+
+The path to the file or directory you want to remove.
+
+---
+
+###### `opts`Optional
+
+- *Type:* RemoveOptions
+
+---
+
+##### `resolve`
+
+```wing
+bring fs;
+
+fs.resolve(...paths: Array);
+```
+
+The right-most parameter is considered {to}. Other parameters are considered an array of {from}.
+
+Starting from leftmost {from} parameter, resolves {to} to an absolute path.
+
+If {to} isn't already absolute, {from} arguments are prepended in right to left order,
+until an absolute path is found. If after using all {from} paths still no absolute path is found,
+the current working directory is used as well. The resulting path is normalized,
+and trailing slashes are removed unless the path gets resolved to the root directory.
+
+###### `paths`Required
+
+- *Type:* str
+
+A sequence of paths or path segments.
+
+---
+
+##### `tryReaddir`
+
+```wing
+bring fs;
+
+fs.tryReaddir(dirpath: str);
+```
+
+If the path exists, read the contents of the directory;
+
+otherwise, return `undefined`.
+
+###### `dirpath`Required
+
+- *Type:* str
+
+The path to evaluate.
+
+---
+
+##### `tryReadFile`
+
+```wing
+bring fs;
+
+fs.tryReadFile(filepath: str, options?: ReadFileOptions);
+```
+
+If the file exists and can be read successfully, read the entire contents;
+
+otherwise, return `undefined`.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The path of the file to be read.
+
+---
+
+###### `options`Optional
+
+- *Type:* ReadFileOptions
+
+The `encoding` can be set to specify the character encoding, or the `flag` can be set to specify the attributes.
+
+---
+
+##### `tryReadJson`
+
+```wing
+bring fs;
+
+fs.tryReadJson(filepath: str);
+```
+
+Retrieve the contents of the file and convert it to JSON if the file exists and can be parsed successfully, otherwise, return `undefined`.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path of the JSON file.
+
+---
+
+##### `tryReadYaml`
+
+```wing
+bring fs;
+
+fs.tryReadYaml(filepath: str);
+```
+
+Convert all YAML objects from a single file into JSON objects if the file exists and can be parsed successfully, `undefined` otherwise.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path of the YAML file.
+
+---
+
+##### `writeFile`
+
+```wing
+bring fs;
+
+fs.writeFile(filepath: str, data: str);
+```
+
+Writes data to a file, replacing the file if it already exists.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path that needs to be written.
+
+---
+
+###### `data`Required
+
+- *Type:* str
+
+The data to write.
+
+---
+
+##### `writeJson`
+
+```wing
+bring fs;
+
+fs.writeJson(filepath: str, obj: Json);
+```
+
+Writes JSON to a file, replacing the file if it already exists.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path that needs to be written.
+
+---
+
+###### `obj`Required
+
+- *Type:* Json
+
+The JSON object to be dumped.
+
+---
+
+##### `writeYaml`
+
+```wing
+bring fs;
+
+fs.writeYaml(filepath: str, ...objs: Array);
+```
+
+Writes multiple YAML objects to a file, replacing the file if it already exists.
+
+###### `filepath`Required
+
+- *Type:* str
+
+The file path that needs to be written.
+
+---
+
+###### `objs`Required
+
+- *Type:* Json
+
+The YANL objects to be dumped.
+
+---
+
+
+
+## Structs
+
+### MkdirOptions
+
+Custom settings for creating directory.
+
+#### Initializer
+
+```wing
+bring fs;
+
+let MkdirOptions = fs.MkdirOptions{ ... };
+```
+
+#### Properties
+
+| **Name** | **Type** | **Description** |
+| --- | --- | --- |
+| mode | str | A file mode. |
+| recursive | bool | Indicates whether parent folders should be created. |
+
+---
+
+##### `mode`Optional
+
+```wing
+mode: str;
+```
+
+- *Type:* str
+- *Default:* "0777"
+
+A file mode.
+
+The string will be parsed as an octal integer.
+
+---
+
+##### `recursive`Optional
+
+```wing
+recursive: bool;
+```
+
+- *Type:* bool
+- *Default:* true
+
+Indicates whether parent folders should be created.
+
+If a folder was created, the path to the first created folder will be returned.
+
+---
+
+### ReadFileOptions
+
+Custom settings for reading file.
+
+#### Initializer
+
+```wing
+bring fs;
+
+let ReadFileOptions = fs.ReadFileOptions{ ... };
+```
+
+#### Properties
+
+| **Name** | **Type** | **Description** |
+| --- | --- | --- |
+| encoding | str | The character encoding utilized for file reading. |
+| flag | str | The `flag` can be set to specify the attributes. |
+
+---
+
+##### `encoding`Optional
+
+```wing
+encoding: str;
+```
+
+- *Type:* str
+- *Default:* "utf-8"
+
+The character encoding utilized for file reading.
+
+---
+
+##### `flag`Optional
+
+```wing
+flag: str;
+```
+
+- *Type:* str
+- *Default:* 'r'.
+
+The `flag` can be set to specify the attributes.
+
+---
+
+### RemoveOptions
+
+Custom settings for removing files and directories.
+
+#### Initializer
+
+```wing
+bring fs;
+
+let RemoveOptions = fs.RemoveOptions{ ... };
+```
+
+#### Properties
+
+| **Name** | **Type** | **Description** |
+| --- | --- | --- |
+| force | bool | When `true`, exceptions will be ignored if `path` does not exist. |
+| recursive | bool | If `true`, perform a recursive directory removal. |
+
+---
+
+##### `force`Optional
+
+```wing
+force: bool;
+```
+
+- *Type:* bool
+- *Default:* false
+
+When `true`, exceptions will be ignored if `path` does not exist.
+
+---
+
+##### `recursive`Optional
+
+```wing
+recursive: bool;
+```
+
+- *Type:* bool
+- *Default:* false
+
+If `true`, perform a recursive directory removal.
+
+In
+recursive mode, operations are retried on failure.
+
+---
+
+