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JSON Quote Fixer
Replace illegal single quotes, smart quotes, and backticks with the double quotes JSON.parse expects — without breaking the strings inside.
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Why quote choice matters
JSON only allows double quotes for strings and keys. Single quotes are JavaScript syntax. Smart quotes look identical at a glance but are different Unicode codepoints. The fixer normalizes all of them to ASCII double quotes while leaving quotes that legitimately appear inside string contents untouched.
How the converter is safe
A naive find-and-replace would corrupt any string that contains an apostrophe. The fixer tokenizes the document first, so quotes inside string contents are left alone — only the structural quotes around keys and string values are converted.
Common sources
Code copied from Python or JavaScript REPLs, AI-generated JSON, JSON pasted from Slack/Discord/email, JSONC config files, and CSVs converted to JSON with naive scripts.
Working at the command line
For batch fixes, jq and a small Node script are usually faster.
# Node — safe single→double quote conversion via JSON5
node -e "const j=require('json5'); const fs=require('fs'); const f=process.argv[1]; fs.writeFileSync(f, JSON.stringify(j.parse(fs.readFileSync(f,'utf8')), null, 2));" file.jsonPrivacy
Browser-only — your JSON is never uploaded.