JSON to JavaScript Converter

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JavaScript and JSON are close enough that any JSON document is already a valid JavaScript expression, but JavaScript adds conveniences JSON forbids. Writing, a key that is a valid identifier is written bare, an empty object or array stays on one line, and numbers travel through the token stream, so a twenty digit integer comes back with all twenty digits. Reading, an object literal with unquoted keys, single quoted strings, comments, trailing commas, template literals without interpolation and a leading const, let or var name are all accepted, and a number spelling JSON rejects, such as .5, 5. or 5.e3, is normalized to its exact JSON form. Everything JSON cannot hold is refused by name rather than guessed at: undefined, NaN and Infinity, hex, octal or binary numbers, numeric separators, a leading zero, a regular expression, a function and template interpolation. A key that appears twice is refused, and a __proto__ key whose value is an object or null is refused too, because in a JavaScript object literal that spelling sets the prototype instead of creating a property. An undefined can become null when you opt in, since JSON has no undefined and silently replacing a value can change what the data meant.

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1. 1 Choose a direction, then paste your document into the left pane or load the sample.
2. 2 Pick the indent width, then press Convert.
3. 3 Copy the result or download it as a file.