This is archived documentation for InfluxData product versions that are no longer maintained. For newer documentation, see the latest InfluxData documentation.
Syntax is always a challenge to remember, so here’s a reference
The syntax for the line protocol is
measurement[,tag_key1=tag_value1...] field_key=field_value[,field_key2=field_value2] [timestamp]
a_measurement,tkey1=tval1,tkey2=tval2 fkey=fval,fkey2=fval2 1234567890000000000
A space must exist between the measurement and the field(s), or between the tag(s) and the field(s) if tags are
The measurement and tags must be separated by a single comma
, with no whitespace.
There must also be whitespace between the field(s) and the timestamp, if one is provided.
otherval are fields,
bat are tags)
a_measurement value=12 a_measurement value=12 1439587925 a_measurement,foo=bar value=12 a_measurement,foo=bar value=12 1439587925 a_measurement,foo=bar,bat=baz value=12,otherval=21 1439587925
a_measurement,value=12 a_measurement value=12,1439587925 a_measurement foo=bar value=12 a_measurement,foo=bar,value=12 1439587925 a_measurement,foo=bar a_measurement,foo=bar 1439587925
Timestamps are not required. When no timestamp is provided the server will insert the point with the local server timestamp. If a timestamp is provided it must be separated from the field(s) by a space. Timestamps must be in Unix time and are assumed to be in nanoseconds. A different precision can be specified, see the HTTP syntax for details. We recommend using the least precise precision possible as this can result in significant improvements in compression.
Tag keys and values, and field keys and values must be separated by the equals sign
= without spaces.
If a tag key, tag value, or field key contains a space , comma
,, or an equals sign
= it must be escaped using the backslash character
Backslash characters do not need to be escaped.
, and spaces will also need to be escaped for measurements, though equals signs
= do not.
# at the beginning of the line is a valid comment character for the line protocol.
All subsequent characters are ignored.
Measurements, tag keys, tag values, and field keys are always stored as strings in the database.
string values have a length limit of 64 KB.
All Unicode characters should be valid, although commas and spaces require escaping.
Backslash characters do not require escaping, but may not be used directly preceding a comma or space.
string field values have different quoting and escaping rules than the measurement, tag, and field name
string syntax.) The field
location="us-west" stores a string value.
Field values may be stored as
All subsequent field values must match the type of the first point written to given measurement.
float64 values are the default numerical type.
1 is a float,
1i is an integer.
int64 values must have a trailing
bikes_present=15i stores an integer and the field
bikes_present=15 stores a float.
boolean values are
TRUE for TRUE, and
FALSE for FALSE
string values for field values must be double-quoted.
Double-quotes contained within the string must be escaped.
All other characters are supported without escaping.
Simplest Valid Point (measurement + field)
disk_free value=442221834240i 1435362189575692182
With Tags, With Timestamp
disk_free,hostname=server01,disk_type=SSD value=442221834240i 1435362189575692182
disk_free free_space=442221834240i,disk_type="SSD" 1435362189575692182
Escaping Commas and Spaces
total\ disk\ free,volumes=/net\,/home\,/ value=442221834240i 1435362189575692182
In the above example, the measurement is written as
total disk free and the tag key
volumes has a tag value of
Escaping Equals Signs
In the above example, the tag key
a=b has a tag value of
With Backslash in Tag Value
Backslashes do not need to be escaped when used in strings. Unless followed by a comma, space, or equals sign backslashes are treated as a normal character.
Escaping Field Key
disk_free value=442221834240i,working\ directories="C:\My Documents\Stuff for examples,C:\My Documents"
In the above example, the second field key is
working directories and the corresponding field value is
C:\My Documents\Stuff for examples,C:\My Documents.
Showing all escaping and quoting behavior
"measurement\ with\ quotes",tag\ key\ with\ spaces=tag\,value\,with"commas" field_key\\\\="string field value, only \" need be quoted"
In the above example, the measurement is
"measurement with quotes", the tag key is
tag key with spaces, the
tag value is
tag,value,with"commas", the field key is
field_key\\\\ and the field value is
string field value, only " need be quoted.
If you write points in a batch all points without explicit timestamps will receive the same timestamp when inserted. Since a point is defined only by its measurement, tag set, and timestamp, that can lead to duplicate points. When InfluxDB encounters a duplicate point, the field set becomes the union of the old field set and the new field set, where any ties go to the new field set. It is a best practice to provide explicit timestamps with all points.
Measurements, tag keys, tag values, and field keys are never quoted. Spaces and commas must be escaped. Field values that are stored as strings must always be double-quoted. Only double-quotes should be escaped.
Querying measurements or tags that contain double-quotes
" can be difficult, since double-quotes are also the syntax for an identifier.
It’s possible to work around the limitations with regular expressions but it’s not easy.
Avoid using Keywords as identifiers (database names, retention policy names, measurement names, tag keys, or field keys) whenever possible. Keywords in InfluxDB are referenced on the InfluxQL Syntax page. There is no need to quote or escape keywords in the write syntax.
All values in InfluxDB are case-sensitive:
The exception is Keywords, which are case-insensitive.
To write points using the command line interface, use the
Write a Point with the CLI
> insert disk_free,hostname=server01 value=442221834240i 1435362189575692182
The CLI will return nothing on success and should give an informative parser error if the point cannot be written. See InfluxDB CLI/Shell for how to import data from a file using the CLI.
To write points using HTTP, POST to the
/write endpoint at port
You must specify the target database in the query string using
You may optionally provide a target retention policy, specify the precision of any supplied timestamps, and pass any required authentication in the query string.
Successful writes will return a
204 HTTP Status Code.
Writes will return a
400 for invalid syntax.
Query String Parameters for Writes
The following query string parameters can be passed as part of the GET string when using the HTTP API:
db=<database>REQUIRED - sets the target database for the write
rp=<retention_policy>- sets the target retention policy for the write. If not present the default retention policy is used
p=<password>- if authentication is enabled, you must authenticate as a user with write permissions to the target database
precision=[n,u,ms,s,m,h]- sets the precision of the supplied Unix time values. If not present timestamps are assumed to be in nanoseconds
Write a Point with
curl -X POST 'http://localhost:8086/write?db=mydb' --data-binary 'disk_free,hostname=server01 value=442221834240i 1435362189575692182'
Write a Point to a non-default Retention Policy
rp=<retention_policy query string parameter to supply a target retention policy.
If not specified, the default retention policy for the target database will be used.
curl -X POST 'http://localhost:8086/write?db=mydb&rp=six_month_rollup' --data-binary 'disk_free,hostname=server01 value=442221834240i 1435362189575692182'
Write a Point Using Authentication
p=<password> to pass the authentication details, if required.
curl -X POST 'http://localhost:8086/write?db=mydb&u=root&p=123456' --data-binary 'disk_free,hostname=server01 value=442221834240i 1435362189575692182'
Specify Non-nanosecond Timestamps
precision=[n,u,ms,s,m,h] query string parameter to supply a precision for the timestamps.
All timestamps are assumed to be Unix nanoseconds unless otherwise specified.
If you provide timestamps in any unit other than nanoseconds, you must supply the appropriate precision in the URL query string.
h for nanoseconds, microseconds, milliseconds, seconds, minutes, and hours, respectively.
curl -X POST 'http://localhost:8086/write?db=mydb&precision=ms' --data-binary 'disk_free value=442221834240i 1435362189575'
Write a Batch of Points with
You can also pass a file using the
The file can contain a batch of points, one per line.
Points must be separated by newline characters
We recommend writing points in batches of 5,000 to 10,000 points.
Smaller batches, and more HTTP requests, will result in sub-optimal performance.
curl -X POST 'http://localhost:8086/write?db=<database>' --data-binary @<filename>
--data-binary encoding method for all writes in the line protocol format.
Using any encoding method other than
--data-binary is likely to lead to issues with writing points.
--data-ascii may all strip out newlines or introduce new unintended formatting.
When passing a file to
curl, the points must be separated by newline characters only (
Files containing carriage returns will cause parser errors.