String to JSON Converter

Convert JavaScript object strings, query parameters, or raw text into valid JSON format. Free online data converter.

Input String

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{ name: "John", age: 30, 'city': "New York" }

{ name: "John", age: 30, 'city': "New York" }

JSON Output

String to JSON Converter

Convert JavaScript objects, query strings, and loose text into strict JSON format.

JS Objects

Converts unquoted keys and single-quoted strings from JS code into strict JSON.

Query Strings

Parses URL parameters (e.g. ?id=1&ref=google) into a structured JSON object.

Auto Detect

Intelligently detects input format and applies the correct conversion logic.

Secure

All parsing happens locally in your browser. Your data is never sent to a server.

How this String to JSON Converter works

This versatile data utility parses various string formats into structured, valid JSON objects. It handles JavaScript-style objects (with unquoted keys or single quotes), URL query strings, and standard text structures. The tool attempts to intelligently fix common syntax issues, such as missing quotes around keys, to produce strictly valid JSON output. Features include a dual-pane view for input and result, error reporting for unparseable text, and a one-click copy function. Useful for converting console log outputs, API parameter strings, or legacy configuration files into standard JSON format for further processing or storage.

How to Use

Input String

Paste a JS object, query string, or loose JSON text.

Convert

Click Convert to transform it into strict JSON.

Result

Copy the valid JSON output.

Example Usage

Here's a typical example of how this tool transforms your data:

Input

{ name: "John", age: 30 }

Output

{ "name": "John", "age": 30 }

Frequently Asked Questions

What formats are supported?

It supports JavaScript objects (keys without quotes, single quotes), URL query parameters (key=value&a=b), and standard JSON.

Is this secure?

The conversion happens entirely in your browser using JavaScript execution for object parsing. No data is sent to any server.

Related Tools

The String to JSON Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.