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This error indicates that the JSON parser is still expecting a closing character or value when the text ends. Empty responses, HTTP 204, missing curly braces, half-strings, timeouts, PHP exits, or bodies that have already been read are common causes.
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SyntaxError: Unexpected end of JSON input
JSON.parse: unexpected end of data
Unexpected end of data at line 1 column 1This error indicates that the JSON parser is still expecting a closing character or value when the text ends. Empty responses, HTTP 204, missing curly braces, half-strings, timeouts, PHP exits, or bodies that have already been read are common causes.
A SyntaxError may stop all subsequent scripts; First resolve the first red record in the Console.
Determine whether the error is source or build with Source map, pretty print and Network URL.
Reduce the issue to a small area with node --check, ESLint, TypeScript or JSON validator.
Check the PHP render, API body, CDN cache and module loader result in the production answer.
Do not accept empty body as valid JSON.
Meaning: Empty text is not JSON.
Possible cause: API returns empty string.
Meaning: Bodyless answer is being read as JSON.
Possible cause: DELETE/PUT endpoint returns 204.
Meaning: The JSON text is incomplete.
Possible cause: Manual string generation or truncated output.
Meaning: The handler is ending without producing an answer.
Possible cause: Authority, validation or early return.
Meaning: Body was read as text/json before.
Possible cause: The same response is being consumed twice.
Meaning: Response is truncated.
Possible cause: Upstream timeout or connection closure.
Meaning: PHP data could not be encoded.
Possible cause: Invalid UTF-8 or recursive data.
Meaning: API body standard is undefined without a result.
Possible cause: Contract is missing.
No records matching this expression were found.
curl -sS -D - https://example.com/api/data -o /tmp/api-body && wc -c /tmp/api-body && head -c 300 /tmp/api-bodyDisplays the header, body size, and start.
python3 -m json.tool < /tmp/api-bodyChecks if the recorded body is a complete JSON.
curl -sSI https://example.com/api/data | grep -iE 'content-length|transfer-encoding|content-type|^HTTP'Response length and transfer type are shown.
node -e "fetch('https://example.com/api/data').then(async r=>console.log(r.status,r.headers.get('content-type'),JSON.stringify(await r.text()))).catch(console.error)"Displays raw response and status information from Node.
grep -RniE 'json_encode|JsonException|Malformed UTF-8' /var/log/php* /var/log/nginx 2>/dev/null | tail -n 80Searches for server errors related to JSON production.
curl -sS -o /dev/null -w 'HTTP:%{http_code} Size:%{size_download}\n' -X DELETE https://example.com/api/item/1Endpoint's status and body size are displayed without a body.
const data = JSON.parse('');const data = text.trim() === '' ? null : JSON.parse(text);const data = await response.json();const data = response.status === 204 ? null : await response.json();echo '{"success":true,"data":' . $data . '}';echo json_encode(['success'=>true,'data'=>$data], JSON_THROW_ON_ERROR);console.log(await response.text());
const data = await response.json();const text = await response.text();
console.log(text);
const data = text ? JSON.parse(text) : null;Chrome DevTools Console, Sources, and Network panels should be examined together with real file, line, and server response.
Node version, package.json module type, build output, and the actual file run should comply with the same module system.
PHP warnings, theme HTML, redirects, and double script loading JavaScript errors may appear.
It occurs when the JavaScript parser, JSON parser, or module loader cannot find the expected grammar.
The line is usually where the parser detects the error. Missing quotes, parentheses, or commas may be in the previous line.
Use source map and DevTools pretty print; correct the original source file and rebuild.
PHP warning, HTML error page or unpadded data pressed may break JavaScript/JSON syntax.
Most parsers find most errors; however, incorrect server response, double script loading, and runtime module configuration should also be checked.
Deploy, minify, cache, package update, Node version, PHP output or half-loaded file behavior may have changed.
Provides diagnostic and safe repair steps; changes should be tested in the staging environment and reverted using Git.
We examine Console, Fetch/AJAX, PHP JSON responses, ES Modules, TypeScript build and WISECP script loading problems without disrupting the production structure.