Fix Invalid JSON and Find Syntax Errors is easiest when you start with the right source and verify the result instead of relying on a format label alone. Check an API payload for invalid commas, quotes and brackets by line number.
Before you begin
Keep a copy of the original file, verify the file type, and determine the result you need before changing anything. Check an API payload for invalid commas, quotes and brackets by line number.
Step-by-step: fix Invalid JSON and Find Syntax Errors
- Step 1 — Keep a copy of the original file, verify the file type, and determine the result you need before changing anything.
- Step 2 — Open MediaExtractr’s JSON validator tool and select your source file. Use the controls described on the tool page to choose the output you need.
- Step 3 — Process the file in your browser, save the resulting download and inspect the output using an app that supports the format.
What to check in the finished file
The goal is a usable result, not merely a file with a new extension. For this workflow, check whether JSON is valid and see the exact line and column of any mistake.. Before using converted data in a production workflow, verify headers, missing values, dates, numeric precision and character encoding with a small representative sample.
- Open the saved file and confirm it is complete and readable or playable.
- Compare the output with the original, especially text, dimensions, audio and page order where relevant.
- Check that the file meets the target app’s upload, compatibility or size requirements.
Common problem and how to avoid it
Valid JSON syntax does not guarantee the data matches the API schema. If the first result does not meet the requirement, return to the original and adjust the relevant settings rather than repeatedly converting an already degraded output.
Try the matching MediaExtractr tool
Use JSON validator at https://www.mediaextractr.com/tools/json-validator. The catalogue describes this file tool as operating locally in the visitor’s browser, without uploading the source file.
Frequently asked questions
What is the simplest way to fix Invalid JSON and Find Syntax Errors?
Open MediaExtractr’s JSON validator tool and select your source file. Use the controls described on the tool page to choose the output you need. Process the file in your browser, save the resulting download and inspect the output using an app that supports the format.
What should I check after using JSON validator?
Open the saved output and check that its content, quality and format match your original goal. Preserve the source file until verification is complete.
What is an important limitation of JSON validator?
Valid JSON syntax does not guarantee the data matches the API schema.
Try the tools
Try it yourself
Everything in this guide runs in your browser. Free, with nothing uploaded.
Open JSON validator
