How do I add quotes to keys that have no quotes?

Paste the object and the tool quotes every bare key for you. JSON requires double-quoted keys, so an input like {name: 'Ada', age: 36} becomes the same object with "name" and "age" wrapped in double quotes. It walks each property, detects an unquoted identifier key (letters, digits, underscore or dollar sign) and wraps it, so you never hand-edit dozens of keys yourself.

Will single quotes be turned into double quotes?

Yes. JSON only allows double-quoted strings, so a value or key written with single quotes is rewritten. Input {greeting: 'hello'} comes out with greeting and hello both in double quotes. Escapes are preserved too, so a single-quoted it's ok keeps its apostrophe. Any double quote already inside the text is escaped in the output so the result still parses.

Can it remove trailing commas?

It can. A trailing comma after the last item, like {a: 1, b: 2,} or [1, 2, 3,], is valid in modern JS but illegal in JSON, so the converter drops it. You can keep your source comma-friendly for clean git diffs and still get strict JSON out, which is exactly what config files and APIs expect.

Are comments stripped out?

Yes. JSON has no comments, so both // line comments and /* block comments */ are removed before output. An object with a // count note after a property comes out with the comment gone and the data intact. Comment markers that appear inside a string value, such as the slashes in a URL like http://a.com, are left alone because they are real text, not code comments.

Why can't I just use JSON.parse on this?

JSON.parse follows the strict JSON grammar. It rejects unquoted keys, single quotes, comments and trailing commas, and throws on the first one it hits. A console-logged object or a JSON5 config breaks every one of those rules, so JSON.parse fails immediately. This tool is the lenient pre-pass that turns that loose syntax into something JSON.parse accepts.

Is eval used to parse the input?

No, and that is the point. Running untrusted text through eval or new Function would execute whatever code is hidden inside it. This converter uses a hand-written tokenizer and recursive-descent parser that only ever produces plain data, so a pasted object can never run code, reach the network, or touch anything outside the page.

Turn a console-logged object into real JSON

You expanded an object in DevTools, hit "Copy object", and pasted it into a fixture file. It looks like JSON but JSON.parse chokes on it because the keys have no quotes and a couple of strings use single quotes. Drop it here, convert, and you get strict JSON you can save as a .json file or feed to an API client without hand-editing every key.

Migrate a JSON5 config to plain JSON

A build tool that used to accept JSON5 now wants strict JSON. Your config is full of comments explaining each setting and a trailing comma on every block. Paste the whole file, and the converter strips the comments and trailing commas in one pass so the new tool accepts it, while you keep the commented original in source control.

Clean up an object pasted from documentation

API docs and blog posts show request bodies as JS objects with bare keys and inline // comments rather than valid JSON. Copy the example, convert it, and you have a payload you can paste straight into Postman or curl, instead of squinting at the snippet and retyping it with the quotes the docs left out.

Sanitize untrusted snippets without running them

A teammate sends a chunk of "JSON" that is really a JS object, and you do not want to eval a stranger's code to read it. Because this tool parses with a tokenizer and never executes the input, you can convert even a sketchy snippet to data safely, then inspect the strict JSON before it goes anywhere near your codebase.

JS Object to JSON: Object Literal and JSON5 Converter

Paste a JS object literal or JSON5, get strict JSON: quote bare keys, swap single quotes, strip comments and trailing commas, runs in your browser

Runs locally
Category Format Converter
Best for Turning pasted content or local files into a handoff-friendly format.

Indent:

JS object / JSON5

Standard JSON

Valid JSON appears here.

What this tool does

Convert a JavaScript object literal or JSON5 into strict, parseable JSON without ever touching eval or new Function. Paste the kind of object you copy straight out of a .js file or a console log: keys without quotes, single-quoted strings, // line and /* block */ comments, a trailing comma after the last property, true/false/null and numbers. The tool runs a small fault-tolerant tokenizer and parser entirely in your browser, adds double quotes around every bare key, rewrites single quotes as double quotes, removes the comments, drops the trailing commas, and pretty-prints the result at 2 spaces, 4 spaces, or compact. Nested objects and arrays come through intact, and commas, colons or comment markers that sit inside a string value are left exactly as written. When the input cannot be parsed you get a friendly message with the line and column of the problem instead of a cryptic JSON.parse stack trace. One click copies the clean JSON, and the shareable link reproduces your exact input and indentation.

Tool details

Input: Text + Numbers + Structured content; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: Shareable URL state; Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget: Initial JS <= 12 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Format Converter · Developer; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How JS Object to JSON fits into your work

Use it when the main problem is getting content from one practical format into another.

Conversion jobs

Turning pasted content or local files into a handoff-friendly format.
Previewing a conversion before you use it in a larger workflow.
Cleaning small format mismatches without opening a full editor.

Conversion checks

Try a small sample first when the source format is messy.
Check character encoding, separators, and line endings after conversion.
Keep the source until the converted output has been reviewed.

Good next steps

These links move the current task into a more complete workflow.

Real-world use cases

Turn a console-logged object into real JSON
You expanded an object in DevTools, hit "Copy object", and pasted it into a fixture file. It looks like JSON but JSON.parse chokes on it because the keys have no quotes and a couple of strings use single quotes. Drop it here, convert, and you get strict JSON you can save as a .json file or feed to an API client without hand-editing every key.
Migrate a JSON5 config to plain JSON
A build tool that used to accept JSON5 now wants strict JSON. Your config is full of comments explaining each setting and a trailing comma on every block. Paste the whole file, and the converter strips the comments and trailing commas in one pass so the new tool accepts it, while you keep the commented original in source control.
Clean up an object pasted from documentation
API docs and blog posts show request bodies as JS objects with bare keys and inline // comments rather than valid JSON. Copy the example, convert it, and you have a payload you can paste straight into Postman or curl, instead of squinting at the snippet and retyping it with the quotes the docs left out.
Sanitize untrusted snippets without running them
A teammate sends a chunk of "JSON" that is really a JS object, and you do not want to eval a stranger's code to read it. Because this tool parses with a tokenizer and never executes the input, you can convert even a sketchy snippet to data safely, then inspect the strict JSON before it goes anywhere near your codebase.

Common pitfalls

Assuming the output is still a JS object you can require(). It is strict JSON, with double-quoted keys, no single quotes, and comments stripped. Save it as .json and parse it with JSON.parse, do not paste it back expecting your comments to survive.
Forgetting that NaN and Infinity are not valid JSON. JSON5 allows them, but strict JSON does not, so the converter writes them as null. If a number really matters, replace it with a real value before converting rather than shipping a silent null.
Expecting it to fix genuinely broken syntax. The parser tolerates JS/JSON5 style, but it cannot guess your intent for a missing value or a stray brace. When that happens it points at the exact line and column so you can fix the source, instead of silently producing wrong data.

Privacy

Every step runs in your browser tab: the tokenizer, the parser and the JSON output are plain JavaScript, and the input never leaves the page. Crucially, the tool never calls eval or new Function, so a pasted object cannot execute code, reach the network, or read anything outside this page, no matter what is hidden inside it. The one caveat: the shareable link encodes your input in the query string, so a link pasted into chat records that text in the recipient server's access log. For a private object, use the copy button and paste the text rather than the URL.

FAQ

Tool combos

Folks in your role tend to reach for these alongside this tool.

Developer

Browse all tools for this role

JS Object to JSON: Object Literal and JSON5 Converter

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How JS Object to JSON fits into your work

Conversion jobs

Conversion checks

Good next steps

Real-world use cases

Turn a console-logged object into real JSON

Migrate a JSON5 config to plain JSON

Clean up an object pasted from documentation

Sanitize untrusted snippets without running them

Common pitfalls

Privacy

FAQ

YAML ⇄ JSON Converter

JSON Formatter & Validator

JSON Minifier

JSON to CSV Converter

Query String to JSON Converter

Angle Converter

Base64 Encoder & Decoder

Base64 to File Converter

BBCode to HTML Converter

Chinese Numeric Converter

Chinese Pinyin Converter

Chinese Zodiac Sign Checker (Sheng Xiao)