JSON Encoder
FreeEncodes plain text into a valid JSON string literal (escaping quotes, backslashes, and line breaks) and decodes it back, with an escape-character breakdown.
Runs entirely in your browser. Your text is never uploaded anywhere.
What this tool does
Converts plain text into a valid JSON string literal (escaping quotes, backslashes, line breaks, and control characters), and converts it back again. Useful for safely embedding arbitrary text inside JSON by hand.
How It Works
Encoding passes your text through the same string-serialization rules the JSON specification defines: a double quote becomes \", a backslash becomes \\, a line break becomes \n, and other control characters become their \uXXXX escape, with the whole result wrapped in double quotes. Decoding reverses this by parsing the escaped text back into its original characters. The tool uses the browser's built-in JSON engine for both directions, so the result always matches the JSON specification exactly.
Problems it solves
- Manually constructing a JSON payload that includes a block of text with quotes or line breaks.
- Reading the real text behind an escaped JSON string seen in a log file or API response.
- Checking exactly which characters in a string require escaping before they can sit inside a JSON document.
Frequently asked questions
›What is the difference between this and a JSON formatter?
This tool converts a plain text string into (or out of) a JSON string literal, handling escaping of quotes, backslashes, and line breaks. A JSON formatter instead takes a full JSON document (an object or array) and pretty-prints or minifies its structure. They solve different problems.
›When would I need to encode a string as JSON?
Common cases are embedding a block of text (with quotes, line breaks, or special characters) inside a JSON payload by hand, debugging an API request body, or preparing a string literal for a configuration file that uses JSON syntax.
›Do I need to include the surrounding quotes when decoding?
No. You can paste the escaped text with or without the surrounding double quotes, the tool detects either form automatically.
›Why did decoding fail with an error?
Decoding fails if the text is not a validly escaped JSON string, for example it contains an unescaped double quote or a backslash that is not part of a valid escape sequence. Check the exact text for stray quotes or backslashes and try again.
›Does this tool support encoding full objects, not just plain text?
No, this tool is specifically for a single plain-text string and its JSON string-literal representation. To build or format a full JSON object or array, use the JSON Formatter tool instead.
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