Line length Open
The `XMLHttpRequest` web API is the **older way** of making HTTP requests in JavaScript. It is not as powerful as the `fetch` API, but it is still widely used and supported in all modern browsers.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
To make a `POST` request, you need to pass an object with the request options as the second argument to `fetch()`. The `method` option is set to `'POST'`, and the `body` option is set to the data you want to send.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Instead of using promises, `XMLHttpRequest` uses **event listeners** to handle the response and errors. The `onload` event is used to handle the response, and the `onerror` event is used to handle errors.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) is a modern replacement for `XMLHttpRequest`. It is a **promise-based** API that allows you to make network requests similar to `XMLHttpRequest`, but with a simpler and more powerful interface.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The following example makes a `GET` request to a given URL using the `XMLHttpRequest` web API. The given `callback` function is called with the `responseText` when the request is successful, and the `err` function is called when an error occurs.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The most common HTTP methods are `GET`, `POST`, `PUT`, and `DELETE`. Sending a request via JavaScript is quite common and can be achieved either using the more modern `fetch` API or the older `XMLHttpRequest` web API.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
First header should be a top level header Open
## Using the Fetch API- Read upRead up
- Exclude checks
MD002 - First header should be a top level header
Tags: headers
Aliases: first-header-h1
Parameters: level (number; default 1)
This rule is triggered when the first header in the document isn't a h1 header:
## This isn't a H1 header
### Another headerThe first header in the document should be a h1 header:
# Start with a H1 header
## Then use a H2 for subsectionsLine length Open
The type of data in the `body` option can vary and should be encoded according to the `Content-type` header. In the following example, the data is encoded as JSON using `JSON.stringify` and the `Content-type` header is set to `'application/json; charset=UTF-8'`.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Multiple headers with the same content Open
### HTTP PUT request- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixesMultiple headers with the same content Open
### HTTP GET request- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixesLine length Open
To make a `DELETE` request, you need to set the `method` option to `'DELETE'` in the request options object. A `DELETE` request does not have a body, so the `body` option is omitted in the following example.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The following example makes a `POST` request to a given URL using the `XMLHttpRequest` web API. The `data` argument is the data you want to send, and the `callback` function is called with the `responseText` when the request is successful. In order to set the `Content-type` header, you need to use the `setRequestHeader` method.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The following example makes a `DELETE` request to a given URL using the `XMLHttpRequest` web API. The `callback` function is called with the `responseText` when the request is successful.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Multiple headers with the same content Open
### HTTP POST request- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixesLine length Open
The simplest use case is to make a `GET` request to a given URL. As the `fetch()` API returns a promise, you can use the `then` method to handle the response. In the following example, the response is converted to JSON using the `json()` method and then logged to the console.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Similarly to the `POST` request, you can make a `PUT` request by setting the `method` option to `'PUT'` in the request options object. The rest of the request options are the same as for the `POST` request.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The **HTTP protocol** is the foundation of data communication on the web. It is a **request-response** protocol, which means that a client sends a request to a server, and the server sends a response back to the client.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
The following example makes a `PUT` request to a given URL using the `XMLHttpRequest` web API. The `data` argument is the data you want to send, and the `callback` function is called with the `responseText` when the request is successful.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Multiple headers with the same content Open
### HTTP DELETE request- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixes