Is there a foolproof method to confirm the validity of this string as JSON?

Question

Is there a foolproof method to confirm the validity of this string as JSON?

I am currently developing an application that requires a function to validate whether a given string parameter is valid JSON. The challenge lies in handling JSON data copied from Jira. For example, the JSON might appear as follows:

"{
    "query": {
        "size": 0,
        "aggregations": {
            "ipTag": {
                "terms": {
                    "field": "ipTag",
                    "size": 1001
                }
            }
        }
    },
    "table": "ip_info_table"
}"

It is unclear whether the unusual format of the string parameter is due to copying and pasting from Jira, or if it is related to MUI Input controls. When I paste the variable into a CDT watch, it appears like this:

"{\n    \"query\": {\n        \"size\": 0,\n ...."

While JSON.parse(param) throws an error,
JSON.parse(JSON.stringify(param)) returns success.
Surprisingly, JSON.parse(JSON.stringify('junk')) also returns success, even though a single word like 'junk' is not considered valid JSON.

What approach or code routine would you recommend for addressing this issue? Is there a specific logic that can be applied to properly format the input parameter value so that JSON.parse() validates it as JSON?

javascript json

Answer 1

Answer №1

To ensure the validity of JSON data, I would utilize the JSON.parse method as shown below:

let valid = false;
try {
  JSON.parse(str);
  console.log('valid');
  valid = true;
} catch {
  console.log('invalid');
}
console.log(valid);

Here are some examples:

const jsonData = `{
    "query": {
        "size": 0,
        "aggregations": {
            "ipTag": {
                "terms": {
                    "field": "ipTag",
                    "size": 1001
                }
            }
        }
    },
    "table": "ip_info_table"
}`;

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

const jsonData = "{\n    \"query\": {\n        \"size\": 0\n} }";

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

const jsonData = `{
    "query": {
        "size": 0,
        "aggregations": {
            "ipTag": {
                "terms": {
                    "field": "ipTag",
                    "size": 1001
                }
            }
        }
    },
    "table": "ip_info_table",
}`;

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

Answer 2

To ensure the validity of JSON data, I would utilize the JSON.parse method as shown below:

let valid = false;
try {
  JSON.parse(str);
  console.log('valid');
  valid = true;
} catch {
  console.log('invalid');
}
console.log(valid);

Here are some examples:

const jsonData = `{
    "query": {
        "size": 0,
        "aggregations": {
            "ipTag": {
                "terms": {
                    "field": "ipTag",
                    "size": 1001
                }
            }
        }
    },
    "table": "ip_info_table"
}`;

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

const jsonData = "{\n    \"query\": {\n        \"size\": 0\n} }";

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

const jsonData = `{
    "query": {
        "size": 0,
        "aggregations": {
            "ipTag": {
                "terms": {
                    "field": "ipTag",
                    "size": 1001
                }
            }
        }
    },
    "table": "ip_info_table",
}`;

try {
    JSON.parse(jsonData);
    console.log('valid');
} catch {
    console.log('invalid');
}

Is there a foolproof method to confirm the validity of this string as JSON?

Answer №1

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