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Turn a loose JavaScript object literal (unquoted keys, single quotes, trailing commas) into strict JSON.
Input
0 chars
Output
0 chars
Status
Ready
Time
0 ms
This conversion runs entirely in your browser — your input never leaves your device.
JS Object to JSON is a free online converter on AltFTool that turns a loose JavaScript object literal (unquoted keys, single quotes, trailing commas) into strict JSON — no signup and nothing to install.
The conversion runs entirely in your browser: the JS Object you paste is converted on your own device and is never uploaded to AltFTool. JS Object to JSON is powered by the json5 library, and the JSON result can be copied or downloaded as js-object-to-json.json.
The input is JavaScript source — an object literal or module, pasted exactly as it appears in your editor.
| Input format | JS Object (JavaScript syntax) |
|---|---|
| Output format | JSON |
| Output file | js-object-to-json.json (application/json) |
| Runs | In your browser — the input is not uploaded. |
| Library | json5 |
| Category | JavaScript converters on AltFTool |
Open JS Object to JSON on AltFTool — the converter loads straight away, with no account.
Paste your JS Object into the left-hand input pane, or press Sample to load a working example.
The conversion runs automatically about 300ms after you stop typing — there is no Convert button, and nothing is uploaded while it works.
If this converter exposes options, open Settings to change them — the output re-runs as you adjust.
Copy the JSON output with the Copy button, or download it as js-object-to-json.json.
No. JS Object to JSON runs entirely in your browser using the json5 library, so the JS Object you paste is converted on your own device and never reaches AltFTool's server.
The json5 library, running in your browser. The JSON you see is that library's output rather than an approximation written here.
There is no server-side limit, because nothing is uploaded — JS Object to JSON converts in your browser, so the practical ceiling is your own device's memory.
The result is JSON. Copy it from the output pane in one click, or download it as js-object-to-json.json — AltFTool names the file after the converter and serves it as application/json.
Yes. JS Object to JSON is free to use on AltFTool, with no account and no sign-up.
Drop the live JS Object to JSON workspace into your own docs page, tutorial or blog post with one snippet. Free, responsive, light and dark — just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/transform/js-object-to-json"
title="JS Object to JSON Converter — free AltFTool widget"
width="100%" height="820" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/transform/js-object-to-json?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>More of AltFTool's JavaScript and format tooling, and the guides around it.