A JSON error message can look technical, but it usually tells you where parsing stopped. The goal is not to rewrite the whole file. The goal is to identify the character, line or structure that broke the JSON.
Paste the data into the JSON Formatter and Validator first. If it still fails, compare the message with the patterns below and read JSON errors explained for non-backend developers for the broader context.
Start near the reported position
If the error mentions a line, column or position, start there and look slightly before it. JSON parsers often report where they finally got confused, not always where the real mistake began.
Check punctuation first
Most quick JSON mistakes are missing commas, extra commas, unclosed quotes, wrong brackets or text copied outside the JSON object. Fix punctuation before changing field names or values.
Do not guess from the top
Changing random parts of the file can create new errors. Work from the reported location, validate again, then move to the next error if one appears.
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