How do I put JSON inside a Solidity string?

Escape every double quote and backslash (or wrap the string in single quotes and escape those instead) and keep it on one line. Solidity string literals cannot contain raw newlines.

Can I use backticks in Solidity?

No. Solidity string literals use double or single quotes only; backtick template strings are a JavaScript feature.

Why escape non-ASCII characters?

Regular Solidity string literals only allow ASCII characters; other text needs the unicode"..." prefix or escape sequences. Escaping as \uXXXX keeps the literal plain ASCII.

JSON to Escaped String for Solidity & JS

Serialize JSON into an escaped single-line string literal for contracts and scripts, and back.

About JSON Serializer

Turn JSON into an escaped, single-line string literal you can paste into Solidity, JavaScript or a deploy script, and turn an escaped literal back into validated, pretty-printed JSON. You can choose double, single or backtick quotes, minify first and escape non-ASCII characters as \uXXXX. A ready-made Solidity string constant is shown for double or single quotes.

Common uses

Embed NFT metadata JSON as a string constant in a contract
Put a JSON config or ABI into a JavaScript or TypeScript deploy script
Recover readable JSON from an escaped string copied out of logs or source code
Check that an escaped JSON string is still valid JSON

FAQ

How do I put JSON inside a Solidity string?: Escape every double quote and backslash (or wrap the string in single quotes and escape those instead) and keep it on one line. Solidity string literals cannot contain raw newlines.
Can I use backticks in Solidity?: No. Solidity string literals use double or single quotes only; backtick template strings are a JavaScript feature.
Why escape non-ASCII characters?: Regular Solidity string literals only allow ASCII characters; other text needs the unicode"..." prefix or escape sequences. Escaping as \uXXXX keeps the literal plain ASCII.