JSONL Validator

How to Use the JSONL Validator Online

Paste your JSONL data into the text area below.
Click the "Validate JSONL" button.
The validation result will appear below the button.

Paste JSONL Data:

JSONL Validator Resources

Here are some useful resources for JSONL validation in various programming environments:

jsonlines - Python package for working with JSONL files
jsonl - npm package for parsing and stringifying JSONL
jsonlines - Ruby gem for reading and writing JSONL files
jsonl-db - A simple JSONL database for Node.js

JSONL Validation Code Samples

Here is a Python code sample to validate a JSONL file

import json

def validate_jsonl(file_path):
    try:
        with open(file_path, 'r') as file:
            for line in file:
                json.loads(line)
        print("Valid JSONL file")
    except json.JSONDecodeError as e:
        print(f"Invalid JSONL: {e}")
    except Exception as e:
        print(f"Error reading file: {e}")

validate_jsonl('path/to/your/file.jsonl')

const fs = require('fs');
const readline = require('readline');

async function validateJsonl(filePath) {
    const fileStream = fs.createReadStream(filePath);
    const rl = readline.createInterface({
        input: fileStream,
        crlfDelay: Infinity
    });

    try {
        for await (const line of rl) {
            JSON.parse(line);
        }
        console.log("Valid JSONL file");
    } catch (error) {
        console.error(`Invalid JSONL: ${error.message}`);
    }
}

validateJsonl('path/to/your/file.jsonl');

Here is a Python code sample to validate a JSONL file

require 'json'

def validate_jsonl(file_path)
  File.foreach(file_path) do |line|
    JSON.parse(line)
  end
  puts "Valid JSONL file"
rescue JSON::ParserError => e
  puts "Invalid JSONL: #{e.message}"
rescue Errno::ENOENT => e
  puts "Error reading file: #{e.message}"
end

validate_jsonl('path/to/your/file.jsonl')

Here is a PHP code sample to validate a JSONL file

<?php

function validateJsonl($filePath) {
    $handle = fopen($filePath, "r");
    if ($handle) {
        while (($line = fgets($handle)) !== false) {
            json_decode($line);
            if (json_last_error() !== JSON_ERROR_NONE) {
                fclose($handle);
                throw new Exception("Invalid JSONL: " . json_last_error_msg());
            }
        }
        fclose($handle);
        echo "Valid JSONL file\n";
    } else {
        echo "Error opening file\n";
    }
}

try {
    validateJsonl('path/to/your/file.jsonl');
} catch (Exception $e) {
    echo $e->getMessage() . "\n";
}

?>

Frequently Asked Questions

How to check if JSON is valid or not?

To check if JSON is valid, you can use a JSON validator tool like the one above, or try parsing the JSON in your programming language of choice. If it parses without errors, it's valid JSON.

What is a JSON validator?

A JSON validator is a tool or program that checks whether a given string or file conforms to the JSON (JavaScript Object Notation) format rules. It ensures that the JSON is well-formed and can be parsed correctly.

How to check if a JSON Schema is valid?

To validate a JSON Schema, you can use specialized JSON Schema validators. These tools check if your schema adheres to the JSON Schema specification. Some popular options include JSONSchemaValidator.net and the JSON Schema Test Suite.

What is the best JSON Schema validator?

The "best" JSON Schema validator depends on your specific needs, but some popular options include:

Ajv for JavaScript
jsonschema for Python
org.everit.json.schema for Java
gojsonschema for Go