SharePoint Multiple Lines of Text Limit for JSON and Mailto Links
Question details
The user needs to know the character capacity of SharePoint's Multiple lines of text column and how to resolve issues where JSON formatting or mailto links break with lengthy content.
- Product
- SharePoint
- Device & OS
- not provided
- Scenario
- Formatting SharePoint list columns with JSON to create clickable mailto links using data from a Multiple lines of text column.
- Observed behavior
- The JSON customization or generated mailto links fail to work properly when the text content in the column is too long.
Ensure you have the appropriate site permissions to edit list columns, modify JSON view formatting, and access list settings in your SharePoint environment.
Verify Character Limits and Troubleshoot JSON Formatting
Check your column character count and ensure your mailto links do not exceed standard browser URL limits, which often cause JSON-formatted links to fail.
A SharePoint 'Multiple lines of text' column supports a maximum of 63,999 characters. However, when using JSON to construct 'mailto:' links from this text, the link may fail. This is usually not a SharePoint limit, but a browser and email client limitation, which typically cap URL lengths at around 2,000 characters.
Verify that the content within your 'Multiple lines of text' column does not exceed the absolute limit of 63,999 characters.
Review the generated mailto link. If the combined length of the email address, subject, and body text exceeds 2,000 characters, browsers will likely truncate it or fail to open the email client. You may need to truncate the text in your JSON payload.
Open the column formatting panel in SharePoint and review your JSON code. Ensure there are no syntax errors, missing brackets, or invalid property references.
If the JSON configuration is correct but still failing, copy your full JSON code and error details, and post a question in the SharePoint Developer section of the Microsoft Q&A community.
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Frequently Asked Questions
What is the maximum character limit for a Multiple lines of text column in SharePoint?
A Multiple lines of text column in SharePoint can store up to a maximum of 63,999 characters.
Why does my JSON mailto link fail when the text is long?
While SharePoint can store up to 63,999 characters, web browsers and email clients typically restrict URLs, including mailto links, to approximately 2,000 characters. If your generated link exceeds this length, it will fail to open.
Can I increase the character limit of SharePoint text columns?
No, the 63,999 character limit for a Multiple lines of text column is a hard limit set by SharePoint and cannot be increased.
Where can I get help with complex SharePoint JSON formatting?
You can seek assistance by posting your full JSON configuration and error logs in the Microsoft Q&A community, specifically under the SharePoint Developer tags.
