PRBLEM / DEVELOPER RESOURCES

PHP Catch a JSON parsing exception

← Back to Code Library

PHPAdvanced

Catch a JSON parsing exception. Learn the syntax using an editable php example.

When to use it

Use this technique in API payloads and structured data interchange. Check the input types, any required imports, and whether the operation changes existing values or produces a new result.

Syntax

catch (JsonException $e) { echo 'Invalid JSON'; }

Parameters

Inspect the literals, variables and function arguments used in the example. Replace values with compatible php types before testing.

Returns / effect

Expected demonstration result: Invalid JSON.

PHP · Editable example
No visitor code executes on the WordPress server.
Edit this example or check its structure. For Python/SQL select Run for real browser-based output.

Expected output

Invalid JSON

Common mistake and fix

Handle malformed input and unexpected schema changes explicitly.

Good practices

Keep the example small, check its documented output, then adapt it to your own project with validation and error handling.

Practice exercise

Try changing one input in the catch a json parsing exception example. Predict how the output changes, then compare with the reference output.

Compatibility: Confirm support in your installed language/runtime version; some examples need modern standard libraries.

Related concepts: json, examples, syntax

Explain this code

This php example shows how to catch a JSON parsing exception. It uses a small, reproducible input so you can inspect the behavior without changing a production project.

Try a small exercise

Try changing one input in the catch a json parsing exception example. Predict how the output changes, then compare with the reference output.

Show a hint

Change a single literal or input first; compare the result before making more edits.

Show example solution
<?php
try { json_decode('{bad}', true, 512, JSON_THROW_ON_ERROR); }
catch (JsonException $e) { echo 'Invalid JSON'; }

Related patterns across languages

Examples share a topic label, but may perform different operations.

Open permanent reference page ↗

Educational examples are not a substitute for a real compiler or version-specific documentation. JavaScript, Python and SQLite demos run in isolated browser contexts when supported; Python and SQL load an online WebAssembly runtime on first use. Other languages receive structural hints, not compiler validation. No visitor code executes on WordPress.