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JSON Encoder / Decoder

Escape plain text strings for safe inclusion in JSON (converts " → \", \ → \\, newlines → \n), or decode JSON-escaped strings back to their original form.

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JSON-Safe String 0 chars
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📖 JSON Escape Reference
"\"
\\\
newline\n
tab\t
carriage return\r
null byte\u0000
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What is JSON String Encoding?

JSON (JavaScript Object Notation) has a strict set of rules for string values. Certain characters must be escaped with a backslash to be valid inside a JSON string: double quotes (" → \"), backslashes (\ → \\), and control characters like newlines (\n), tabs (\t), and carriage returns (\r). This tool handles the escaping and unescaping of these characters.

Frequently Asked Questions

Any time you're building a JSON string manually (concatenating strings rather than using a JSON library like JSON.stringify()), or when you need to embed a multi-line string or a string containing quotes into a JSON value. In practice, always prefer JSON.stringify() in JavaScript — it handles all escaping correctly and handles edge cases you might miss.
JSON encoding escapes special characters within a string so it's valid JSON syntax — the result is still human-readable text. Base64 encoding converts arbitrary binary data to an ASCII-safe format — the result looks like random characters and is ~33% larger. Use JSON escaping when you need a valid JSON string; use Base64 when you need to embed binary data (like images) in JSON.
The JSON specification (RFC 8259) requires that control characters (U+0000 through U+001F) be escaped. These characters include newline, tab, carriage return, and others that would break string parsing if left unescaped. Unescaped control characters make JSON technically invalid and can cause subtle bugs in parsers.
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Frequently Asked Questions

Is this JSON Encoder / Decoder free to use? +
Yes, completely free. No signup, no account, no payment required. Just paste your input and use it directly in your browser.
Does this tool store or send my data anywhere? +
No. Everything runs entirely in your browser using JavaScript. Your data never leaves your device or gets sent to any server.
What browsers does this tool support? +
It works in all modern browsers — Chrome, Firefox, Safari, Edge, and Opera — on both desktop and mobile.
Can I use this tool offline? +
Once the page is loaded, the tool runs locally in your browser without needing an active internet connection for most operations.
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This JSON Encoder / Decoder works for most use cases — but if you need batch processing, API access, private hosting on your own domain, or a completely bespoke tool built around your workflow, I can build it.

Request Custom Build → Typical turnaround: 3–7 days