Error map
CastError ObjectId CastError: Cast to ObjectId failed for value "x" (type string) at path "_id"
Node.js · layer 4, Application & API
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
HTTP 422 Unprocessable Content
The request is well-formed, but the data fails validation (e.g. invalid email, missing required field).
java.lang.IllegalArgumentException
A method rejected an argument value as invalid.
ValidationError: User validation failed: email: Path `email` is required.
A document failed Mongoose schema validation before saving.
strict decoding error: unknown field "spec.template.spec.containers[0].ports[0].protocl"
The manifest contains a field the API schema doesn’t know — a typo, wrong indentation, or a field from another API version.
MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
The MongoDB driver couldn’t find a reachable server for the connection string.
ERROR: invalid input syntax for type uuid: "x"
A value that isn’t a valid UUID was compared with or inserted into a uuid column.
API Error: Invalid type — expected integer, received string
A request field has the wrong data type — a string where the API expects a number, a number where it expects a boolean, an object…
API Error: Invalid date format — expected ISO 8601 (YYYY-MM-DDTHH:mm:ssZ)
A date or timestamp in the request isn’t in the format the API expects — usually ISO 8601 with a time zone, or a Unix timestamp.
API Error: Invalid ID format (not a valid UUID / malformed identifier)
An ID in the URL or body doesn’t have the shape the API expects — a malformed UUID, wrong prefix, or an ID mangled by encoding or…
error converting YAML to JSON: yaml: line 12: did not find expected key
The manifest isn’t valid YAML — usually indentation, a tab character, or an unquoted special character.
MongoDB: MongoServerError: Document failed validation (code 121)
The collection has a JSON Schema validator and the inserted/updated document doesn’t satisfy it.
API Error: Invalid parameter value — must be one of the allowed values / out of range
The field has the right type but a value the API doesn’t allow — not in the list of accepted options, too small or large, too lon…
Two steps away (36)
HTTP 400 Bad Request
The server could not understand the request because its syntax, headers or body are malformed or invalid.
HTTP 415 Unsupported Media Type
The server refuses the request because the body’s Content-Type isn’t one it accepts.
HTTP 409 Conflict
The request conflicts with the current state of the resource — e.g. a duplicate or an edit based on an outdated version.
java.lang.NumberFormatException: For input string: "x"
A string couldn’t be parsed as a number — it’s empty, has spaces/commas, is too large, or isn’t numeric.
java.lang.IllegalStateException
A method was called when the object wasn’t in the right state for it.
java.lang.ArithmeticException: / by zero
Integer division or modulo by zero.
Express: req.body is undefined / {} (body parser missing)
Express didn’t parse the request body because no body-parsing middleware matched the request’s Content-Type.
MongooseError: Operation `users.find()` buffering timed out after 10000ms
Mongoose queued a query waiting for a connection that never opened.
MongoServerError: E11000 duplicate key error collection: db.users index: email_1 dup key
An insert/update violated a unique index in MongoDB.
MySQL ERROR 1406: Data too long for column
The value is longer than the column allows (e.g. 300 characters into VARCHAR(255)), and strict mode rejects it instead of truncat…
MethodArgumentNotValidException: Validation failed for argument [0]
Bean Validation (@Valid with @NotNull, @Email, @Size…) rejected the request body.
MySQL ERROR 1048 (23000): Column 'x' cannot be null
An INSERT/UPDATE put NULL into a NOT NULL column.
Error: connect ECONNREFUSED 127.0.0.1:5432
Nothing is listening at that host:port — the target service is down or you’re connecting to the wrong address.
Error: P1001: Can't reach database server at `host`:`5432`
Prisma couldn’t connect to the database in DATABASE_URL.
SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:5432
Sequelize couldn’t connect to the database server.
MySQL ERROR 1264 (22003): Out of range value for column 'x' at row 1
A number is too large (or negative for UNSIGNED) for the column type.
MySQL ERROR 1366 (HY000): Incorrect integer value: '' for column 'x' at row 1
An empty string or non-numeric text was inserted into an INT column under strict mode.
ERROR: null value in column "x" of relation "y" violates not-null constraint
An INSERT/UPDATE put NULL into a NOT NULL column.
MySQL ERROR 1292 (22007): Incorrect datetime value: 'x' for column 'y'
A string couldn’t be converted to DATE/DATETIME — wrong format, empty string, or a zero date in strict mode.
MySQL ERROR 1690 (22003): BIGINT UNSIGNED value is out of range
Arithmetic on UNSIGNED columns produced a negative result.
ERROR: new row for relation "x" violates check constraint "y"
A value failed a CHECK constraint (e.g. price > 0, status IN (…)).
java.time.format.DateTimeParseException: Text '31/12/2024' could not be parsed at index 2
A java.time parse call got text that doesn’t match the expected format.
java.text.ParseException: Unparseable date: "x"
SimpleDateFormat couldn’t parse the string with its pattern.
RangeError: Invalid time value
A Date is invalid (NaN), and toISOString() or a formatting library couldn’t format it.
API Error: Missing required parameter (parameter_missing / "x" is required)
The API rejected the request because a field it requires — in the query string, path, headers or JSON body — wasn’t sent or was e…
API Error: No such object / resource_missing (resource not found by ID)
The endpoint exists, but the ID you passed — in the URL or as a reference in the body — doesn’t match any record the caller can s…
API Error: limit must be less than or equal to 100 (page size exceeds maximum)
You asked for more items per page than the endpoint allows.
docker compose: services.x Additional property y is not allowed / yaml: line N: mapping values are not allowed
The compose file is invalid YAML or uses a key Compose doesn’t recognise at that level (usually an indentation mistake).
ERROR: invalid input syntax for type integer: "abc"
A string couldn’t be converted to the column’s type (integer, numeric, boolean, date…).
ERROR: value too long for type character varying(255)
A string exceeds the column’s varchar length.
MySQL ERROR 1146 (42S02): Table 'db.table' doesn't exist
The query references a table that MySQL can’t find in that database.
MySQL ERROR 1054 (42S22): Unknown column in 'field list'
The query references a column that doesn’t exist in the table (or an unquoted string being read as a column).
PostgreSQL: ERROR: relation "x" does not exist
The table/view isn’t found — missing migration, wrong schema, or a case-sensitive quoted name.
pydantic_core._pydantic_core.ValidationError: 1 validation error for Model
Data didn’t match a Pydantic model — a field is missing, has the wrong type, or fails a constraint.
API Error: Request failed schema validation (must NOT have additional properties / Additional properties are not allowed)
The JSON body doesn’t match the endpoint’s schema — an unknown property, wrong nesting, or a missing required object.
Upload error: File type not allowed / unsupported file type
The upload was rejected because the file’s type — extension, MIME type or actual content — isn’t on the allowed list.
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