JSON Validation and Common Errors

jq empty input.json

# Parse a file and fail if JSON is invalid.

python -m json.tool input.json

# Check syntax and pretty-print if valid.

node -e 'JSON.parse(require("fs").readFileSync("input.json", "utf8")); console.log("valid")'

# Parse a file with JavaScript runtime tooling.

{ "name": "Ada" }

# Strings and keys must use double quotes.

[
  1,
  2,
  3
]

# Do not leave a comma after the last item.

{ "enabled": true }

# Bare identifiers are invalid in JSON.

{
  "text": "line 1
line 2"
}

# Use `\n` rather than an actual line break inside a string literal.

jq . broken-or-ugly.json > normalized.json

# Read and immediately re-emit clean JSON.