Go errors

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Top tools (local-only)

• JSON Validator
• JSON Repair
• YAML Validator
• CSV Validator
• XML to JSON
• Base64 Encode/Decode
• URL Encode/Decode
• JWT Decoder

JSON parse / deserialize errors

Most issues are not “bad JSON” but wrong content (HTML), truncation, extra characters, invalid escapes, or encoding.

• invalid character '0' in string escape code
• invalid character '1' in string escape code
• invalid character '2' in string escape code
• invalid character '3' in string escape code
• invalid character '4' in string escape code
• invalid character '5' in string escape code
• invalid character '<' looking for beginning of value
• invalid character ']' after top-level value
• invalid character 'b' in string escape code
• invalid character 'f' in string escape code
• invalid character 'n' in string escape code
• invalid character 'o' looking for beginning of value
• invalid character 'r' in string escape code
• invalid character 't' in string escape code
• invalid character 'u' in string escape code
• invalid character 'u' looking for beginning of value
• invalid character 'x' in string escape code
• invalid character '}' after top-level value
• json: cannot unmarshal array into Go struct field Item.price of type bool
• json: cannot unmarshal array into Go struct field Item.price of type float64
• json: cannot unmarshal array into Go struct field Item.price of type int
• json: cannot unmarshal array into Go struct field Item.price of type int64
• json: cannot unmarshal array into Go struct field Item.price of type string
• json: cannot unmarshal array into Go struct field Item.price of type time.Time
• json: cannot unmarshal array into Go struct field Meta.count of type bool
• json: cannot unmarshal array into Go struct field Meta.count of type float64
• json: cannot unmarshal array into Go struct field Meta.count of type int
• json: cannot unmarshal array into Go struct field Meta.count of type int64
• json: cannot unmarshal array into Go struct field Meta.count of type string
• json: cannot unmarshal array into Go struct field Meta.count of type time.Time
• json: cannot unmarshal array into Go struct field Payload.items of type bool
• json: cannot unmarshal array into Go struct field Payload.items of type float64
• json: cannot unmarshal array into Go struct field Payload.items of type int
• json: cannot unmarshal array into Go struct field Payload.items of type int64
• json: cannot unmarshal array into Go struct field Payload.items of type string
• json: cannot unmarshal array into Go struct field Payload.items of type time.Time
• json: cannot unmarshal array into Go struct field Payload.user of type bool
• json: cannot unmarshal array into Go struct field Payload.user of type float64
• json: cannot unmarshal array into Go struct field Payload.user of type int
• json: cannot unmarshal array into Go struct field Payload.user of type int64
• json: cannot unmarshal array into Go struct field Payload.user of type string
• json: cannot unmarshal array into Go struct field Payload.user of type time.Time
• json: cannot unmarshal array into Go struct field Token of type bool
• json: cannot unmarshal array into Go struct field Token of type float64
• json: cannot unmarshal array into Go struct field Token of type int
• json: cannot unmarshal array into Go struct field Token of type int64
• json: cannot unmarshal array into Go struct field Token of type string
• json: cannot unmarshal array into Go struct field Token of type time.Time
• json: cannot unmarshal array into Go struct field User.createdAt of type bool
• json: cannot unmarshal array into Go struct field User.createdAt of type float64
• json: cannot unmarshal array into Go struct field User.createdAt of type int
• json: cannot unmarshal array into Go struct field User.createdAt of type int64
• json: cannot unmarshal array into Go struct field User.createdAt of type string
• json: cannot unmarshal array into Go struct field User.createdAt of type time.Time
• json: cannot unmarshal array into Go struct field User.email of type bool
• json: cannot unmarshal array into Go struct field User.email of type float64
• json: cannot unmarshal array into Go struct field User.email of type int
• json: cannot unmarshal array into Go struct field User.email of type int64
• json: cannot unmarshal array into Go struct field User.email of type string
• json: cannot unmarshal array into Go struct field User.email of type time.Time
• json: cannot unmarshal array into Go struct field User.id of type bool
• json: cannot unmarshal array into Go struct field User.id of type float64
• json: cannot unmarshal array into Go struct field User.id of type int
• json: cannot unmarshal array into Go struct field User.id of type int64
• json: cannot unmarshal array into Go struct field User.id of type string
• json: cannot unmarshal array into Go struct field User.id of type time.Time
• json: cannot unmarshal array into Go value of type []float64
• json: cannot unmarshal array into Go value of type []int
• json: cannot unmarshal array into Go value of type []map[string]interface{}
• json: cannot unmarshal array into Go value of type []string
• json: cannot unmarshal array into Go value of type bool
• json: cannot unmarshal array into Go value of type int64
• json: cannot unmarshal array into Go value of type map[string]string
• json: cannot unmarshal array into Go value of type time.Time
• json: cannot unmarshal bool into Go struct field Item.price of type bool
• json: cannot unmarshal bool into Go struct field Item.price of type float64
• json: cannot unmarshal bool into Go struct field Item.price of type int
• json: cannot unmarshal bool into Go struct field Item.price of type int64
• json: cannot unmarshal bool into Go struct field Item.price of type string
• json: cannot unmarshal bool into Go struct field Item.price of type time.Time
• json: cannot unmarshal bool into Go struct field Meta.count of type bool
• json: cannot unmarshal bool into Go struct field Meta.count of type float64
• json: cannot unmarshal bool into Go struct field Meta.count of type int
• json: cannot unmarshal bool into Go struct field Meta.count of type int64
• json: cannot unmarshal bool into Go struct field Meta.count of type string
• json: cannot unmarshal bool into Go struct field Meta.count of type time.Time
• json: cannot unmarshal bool into Go struct field Payload.items of type bool
• json: cannot unmarshal bool into Go struct field Payload.items of type float64
• json: cannot unmarshal bool into Go struct field Payload.items of type int
• json: cannot unmarshal bool into Go struct field Payload.items of type int64
• json: cannot unmarshal bool into Go struct field Payload.items of type string
• json: cannot unmarshal bool into Go struct field Payload.items of type time.Time
• json: cannot unmarshal bool into Go struct field Payload.user of type bool
• json: cannot unmarshal bool into Go struct field Payload.user of type float64
• json: cannot unmarshal bool into Go struct field Payload.user of type int
• json: cannot unmarshal bool into Go struct field Payload.user of type int64
• json: cannot unmarshal bool into Go struct field Payload.user of type string
• json: cannot unmarshal bool into Go struct field Payload.user of type time.Time
• json: cannot unmarshal bool into Go struct field Token of type bool
• json: cannot unmarshal bool into Go struct field Token of type float64
• json: cannot unmarshal bool into Go struct field Token of type int
• json: cannot unmarshal bool into Go struct field Token of type int64
• json: cannot unmarshal bool into Go struct field Token of type string
• json: cannot unmarshal bool into Go struct field Token of type time.Time
• json: cannot unmarshal bool into Go struct field User.createdAt of type bool
• json: cannot unmarshal bool into Go struct field User.createdAt of type float64
• json: cannot unmarshal bool into Go struct field User.createdAt of type int
• json: cannot unmarshal bool into Go struct field User.createdAt of type int64
• json: cannot unmarshal bool into Go struct field User.createdAt of type string
• json: cannot unmarshal bool into Go struct field User.createdAt of type time.Time
• json: cannot unmarshal bool into Go struct field User.email of type bool
• json: cannot unmarshal bool into Go struct field User.email of type float64
• json: cannot unmarshal bool into Go struct field User.email of type int
• json: cannot unmarshal bool into Go struct field User.email of type int64
• json: cannot unmarshal bool into Go struct field User.email of type string
• json: cannot unmarshal bool into Go struct field User.email of type time.Time
• json: cannot unmarshal bool into Go struct field User.id of type bool
• json: cannot unmarshal bool into Go struct field User.id of type float64
• json: cannot unmarshal bool into Go struct field User.id of type int
• json: cannot unmarshal bool into Go struct field User.id of type int64

YAML parse errors

YAML is indentation-sensitive. Fix the first reported line/column, then validate again before converting.

• error converting YAML to JSON: yaml: line 2: did not find expected key
• error converting YAML to JSON: yaml: line 2: found character that cannot start any token
• error converting YAML to JSON: yaml: line 2: mapping values are not allowed in this context
• yaml: line 2: did not find expected '-' indicator
• yaml: line 2: did not find expected key
• yaml: line 2: found character that cannot start any token
• yaml: line 2: mapping values are not allowed in this context

CSV parser errors

CSV issues are usually delimiter + quoting rules. Find the first broken row and fix it.

• bare " in non-quoted-field
• extraneous or missing " in quoted-field
• record on line 2: wrong number of fields
• wrong number of fields

XML parsing errors

XML is strict: a single invalid character or unescaped ampersand can break parsing. Fix the first error and re-validate.

• XML syntax error on line 1: invalid character entity
• XML syntax error on line 1: unexpected EOF

Encoding / token errors (Base64, URL, JWT)

Encoded strings may contain secrets. Decode locally and normalize Base64URL/percent-encoding safely.

• illegal base64 data at input char
• illegal base64 data at input char (RawURLEncoding)
• jwt: signature is invalid
• jwt: token contains an invalid number of segments
• jwt: token is expired
• net/url: invalid URL escape

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