Truncate JSON
Truncate all values or keys in a JSON structure. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Truncate JSON
- 1. Paste your JSON. Paste the JSON document containing long values, keys, or both, that you want shortened down to a manageable length for display or sampling purposes.
- 2. Choose what to truncate and the max length. Select Values, Keys or Both in Truncate, then set Max length to the character count where each string should be cut off, however long or short you need it.
- 3. Set the ellipsis and indent, then copy. Turn on Append … to truncated strings to mark where text was cut, choose an Indent width, and copy the resulting JSON with every long string shortened to your limit.
When to use Truncate JSON
Truncate JSON shortens long string values, keys, or both, down to a maximum length you choose, useful for previewing large documents or sampling data without displaying every character. Truncate JSON keeps the overall structure intact while trimming what makes it unwieldy.
- Previewing a document with very long text fields. A JSON record contains a lengthy description or comment field, and you want a shortened preview version to display in a UI list without the full text taking over the view.
- Creating a compact sample for a bug report. A payload you want to attach to a bug report has extremely long values that aren't relevant to the issue, and truncating them keeps the report focused and readable.
- Fitting JSON output into a terminal or log line width. You are logging JSON data and want to cap how long any single field can be so log lines stay a manageable width in a terminal or log viewer.
- Reviewing key names in an unfamiliar schema. You want to scan a document's key names quickly without long values cluttering the view, so truncating just the values while leaving keys intact keeps the structure visible.
Examples
Shorten long string values
Input
{"quote": "Simplicity is the soul of efficiency"}Output
{
"quote": "Simplicity…"
}About the Truncate JSON tool
Truncate JSON is a free online tool that works entirely inside your web browser. Truncate all values or keys in a JSON structure. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 90 JSON utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 4 settings, including Truncate, Max length, Append … to truncated strings and Indent, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Truncate JSON cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.