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Im having some issues with Json and PHP on HTML website


New Coder
Im working on website that is linked to phpmyadmin database. the goal of this is to allow users to input data, search the data and display it and delete a record. these records being information for clients. but I'm having issues with the data being inserted into the database using the front end. this is my error. i would also like to point out that i am not getting any errors on my IDE and i have xxamp running while attempting this project. xxamp is running both MySQL and apache services, xxamp is running as administrator.

VM327:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<br />
<b>"... is not valid JSON

i am using VS code IDE and so far i have 1html file, 1js file, 5php files and a CSS file

HTML is my main interface
js passes the function from PHP to my HTML
my 5php files are:
  • database connection
  • delete function
  • Search function
  • insert function
  • functions (in this one i declared what search, delete and insert do)

i also would like to mention that i am fairly new to programming so i may not understand more advanced terms or simple terms. if you guys want to see my source code i will gladly send it. If anyone can help with this i would greatly appreciate it. thank you guys in advance

Hey thanks for the reply. but i have been reviewing my code and i dont see an instance of where i used this tag. i know it cant be in my PHP because i read it it doesn't serve well. but the only places i have <br> tags or something similar to that are in my HTML and js. please have a look .

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Visitor Management</title>
    <link rel="stylesheet" href="design.css">
    <h1>Client Management</h1>
    <form id="visitorForm">
        <input type="text" name="full_name" placeholder="Full Name" required>
        <input type="text" name="purpose_of_visit" placeholder="Purpose of Visit" required>
        <input type="text" name="phone_number" placeholder="Phone Number" required>
        <input type="date" name="todays_visit" required>
        <input type="date" name="next_visit">
        <input type="number" step="0.01" name="amount_paid" placeholder="Amount Paid" required>
        <button type="submit">Add Visitor</button>
    <input type="text" id="searchInput" placeholder="Search visitors">
    <div id="visitorList"></div>
    <script src="script.js"></script>
the above is the index html

below is the js
document.getElementById('visitorForm').addEventListener('submit', function (e) {

    let formData = new FormData(this);
    fetch('insert.php', {
        method: 'POST',
        body: formData
    .then(response => response.json())
    .then(data => {
        if (data.status === 'success') {
            alert('Visitor added successfully');
        } else {
            alert('Failed to add visitor');

document.getElementById('searchInput').addEventListener('input', function () {
    let query = this.value;
    .then(response => response.json())
    .then(data => {

function loadVisitors() {
    .then(response => response.json())
    .then(data => {

function displayVisitors(visitors) {
    let visitorList = document.getElementById('visitorList');
    visitorList.innerHTML = '';
    visitors.forEach(visitor => {
        let visitorItem = document.createElement('div');
        visitorItem.innerHTML = `
                <p>Purpose: ${visitor.purpose_of_visit}</p>
                <p>Phone: ${visitor.phone_number}</p>
                <p>Today's Visit: ${visitor.todays_visit}</p>
                <p>Next Visit: ${visitor.next_visit}</p>
                <p>Amount Paid: ${visitor.amount_paid}</p>
                <button onclick="deleteVisitor(${visitor.id})">Delete</button>

function deleteVisitor(id) {
    if (confirm('Are you sure you want to delete this visitor?')) {
        fetch('delete.php', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            body: JSON.stringify({ id: id })
        .then(response => response.json())
        .then(data => {
            if (data.status === 'success') {
                alert('Visitor deleted successfully');
            } else {
                alert('Failed to delete visitor');

// Load initial visitor list

thanks in advance.
Last edited by a moderator:
No. this is how that looks
include 'functions.php';

// Check if the "query" parameter is set in the URL
if (isset($_GET['query'])) {
    $query = $_GET['query'];

    // Call the searchVisitors function with the provided query
    $results = searchVisitors($query);

    // Return the search results as JSON
    echo json_encode($results);
} else {
    // If the "query" parameter is not set, return an error response
    echo json_encode(['error' => 'Query parameter is missing']);
Last edited by a moderator:
You can verify in the Network tab of the dev inspector the output of your http request. I am pretty sure you will see that the response is not just JSON. It also includes HTML from a PHP error.

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