Encode a complete JSON document inside a JSON string
JSON Stringify wraps an entire valid JSON document as one quoted JSON string. This is useful when a protocol expects serialized JSON inside another string field.
When should you use it?
- Embed a JSON body inside a JSON message.
- Prepare a document for a string-only integration field.
- Preserve the exact source text inside a quoted value.
Example: wrap JSON as a string
The outer quotes make the entire document one string value; parsing that string recovers the original text.
{"a":1}"{\"a\":1}"Use stringify when a field expects serialized JSON
Some APIs place a JSON document inside a string-valued field. That outer layer needs escaped quotes, backslashes, and control characters so it can contain the inner source safely. This tool validates the document and produces that quoted string representation. It preserves the inner source text rather than rebuilding the document from ordinary JavaScript values.
Confirm that a string layer is really required
An endpoint expecting an object should receive an object. Sending a string containing the same object changes its type, even if the visible text looks similar. Compare the API example or schema before encoding. If a response already contains an encoded document string, stringify again only when another explicit layer is required; otherwise use Unstringify to recover the inner document.
How do I put a whole JSON document inside a JSON string field?
Stringify the valid source document to produce one escaped JSON string literal. Place that result as the value of the outer field without adding another manual escape layer. The decoded string retains the original document text, including whitespace.
JSON envelope containing stringified JSON
json{"payload":"{\"id\":7,\"ready\":true}"}The payload field is a string, not a nested object. The receiver must parse the outer object, then parse payload if it needs the inner structure.
Why does the output contain so many backslashes?
Quotes inside the document have to be escaped so the entire document can live inside one outer JSON string. Those backslashes are part of the serialized representation.
What should you check before using the result?
Stringify does not transform the original object into an outer object or repair broken input. A receiver must parse the outer string and then parse the inner JSON if it needs the original structure.
Understand JSON syntaxTechnical reference: JSON syntax and interoperability · RFC 8259