JSON Stringify Tool
Convert JavaScript objects to JSON strings
About the JSON Stringify Tool
Turning a loose JavaScript object into a clean, properly quoted JSON string is a constant need when you are moving data from code into a config file, a test fixture, or an API request body. JSON Stringify does exactly that: paste an object and it returns a valid, indented JSON string.
What sets it apart from a strict parser is tolerance for the way developers actually write objects. It accepts relaxed JavaScript syntax — unquoted keys, single quotes, trailing commas — and produces strict, double-quoted JSON from it, so you can copy an object straight out of your editor without first hand-fixing every quote.
You control the indentation, anywhere from compact single-line output to a generously spaced eight-space layout, which is handy whether you are minifying for a request or making a fixture readable.
How to Use the JSON Stringify Tool
- Paste your JavaScript object into the "JavaScript Object" box — unquoted keys and single quotes are fine.
- Set the "Spacing" value (0 to 8) to control indentation; 0 produces compact single-line JSON, 2 is the common default.
- Read the formatted JSON string in the output.
- Click Copy to grab it, or Download to save it as a .json file.
Why Use ToolForge’s JSON Stringify Tool
- It accepts relaxed JavaScript object syntax, not just strict JSON, so you can paste an object literal from your code without manually quoting every key first.
- Indentation is adjustable from 0 to 8 spaces, covering both minified output and human-readable fixtures from one control.
- Output can be copied or downloaded directly as a .json file, skipping the save-as dance.
- Conversion happens locally in your browser, so object data you paste is never uploaded.
Frequently Asked Questions
What is the difference between this and a JSON parser?
A parser takes a JSON string and reads it into structured data (or re-indents it). This tool goes the other direction: it takes a JavaScript object and produces a JSON string from it, conveniently accepting relaxed syntax like unquoted keys on the way in.
Why does my output use double quotes when I typed single quotes?
That is correct behavior. The JSON specification requires double quotes around strings and keys, so the tool converts your single-quoted, possibly unquoted input into spec-compliant double-quoted JSON.
What does a spacing of 0 do?
It produces minified JSON on a single line with no extra whitespace — ideal for embedding in a request body or a compact config. Increase the spacing to 2 or 4 when you want the output indented and easy to read.
